Tropical Cyclones
[Index] | Tropical Cyclone BIANCA : JTWC Advisories |
Season 2010-2011 Summaries (Operational Data): [AU] [SIO] [SPAC] [SH] | |
---> Tropical Cyclone BIANCA Track Map and Data |
WTXS21 PGTW 20110124 12:30z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE FORMATION ALERT// RMKS/ 1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN 130 NM EITHER SIDE OF A LINE FROM 14.5S 126.5E TO 18.1S 120.0E WITHIN THE NEXT 12 TO 24 HOURS. AVAILABLE DATA DOES NOT JUSTIFY ISSUANCE OF NUMBERED TROPICAL CYCLONE WARNINGS AT THIS TIME. WINDS IN THE AREA ARE ESTIMATED TO BE 25 TO 30 KNOTS. METSAT IMAGERY AND RADAR DATA AT 241200Z INDICATE THAT A CIRCULATION CENTER IS LOCATED NEAR 14.7S 126.1E. THE SYSTEM IS MOVING WEST-SOUTHWESTWARD AT 05 KNOTS. 2. REMARKS: THE AREA OF CONVECTION PREVIOUSLY LOCATED NEAR 14.5S 126.6E IS NOW LOCATED NEAR 14.7S 126.1E, APPROXIMATELY 305 NM WEST- SOUTHWEST OF DARWIN AUSTRALIA. RECENT ANIMATED INFRARED SATELLITE IMAGERY AND A RADAR LOOP FROM WYNDHAM, AUSTRALIA DEPICT A DEVELOPING LOW LEVEL CIRCULATION CENTER (LLCC) WITH TIGHTLY CURVED CONVECTIVE BANDING AND CONSOLIDATING CONVECTION ALONG THE NORTHWESTERN COAST OF AUSTRALIA. AT 24/06Z, SURFACE OBSERVATIONS FROM TRUSCOTT SHOWED A DECREASE IN SEA LEVEL PRESSURE (SLP) OF ALMOST 4 MB IN THE LAST 24 HOURS AND A MINIMUM SLP OF 999 MB WITH 25 TO 30 KNOT WINDS. MORE RECENT OBSERVATIONS REVEAL INCREASING PRESSURE NEAR TRUSCOTT (1002 MB) AND DECREASING PRESSURE TO THE SOUTHWEST NEAR DOONGAN (999 MB), SUGGESTING THE LLCC IS DRIFTING SOUTHWESTWARD ALONG THE COAST. UPPER LEVEL ANALYSIS REVEALS THE SYSTEM IS EQUATORWARD OF THE RIDGE AXIS IN A REGION OF MODERATE EASTERLY VERTICAL WIND SHEAR AND DIFFLUENT FLOW ALOFT. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 25 TO 30 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 999 MB. DUE TO INCREASED CONSOLIDATION OF THE LLCC AND OBSERVED PRESSURE FALLS, THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS GOOD. 3. THIS ALERT WILL BE REISSUED, UPGRADED TO WARNING OR CANCELLED BY 251230Z.// ========================================================================= WTXS33 PGTW 20110125 15:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 10S (TEN) WARNING NR 001// REF/A/MSG/NAVMARFCSTCEN PEARL HARBOR HI/241221JAN2011// AMPN/REF A IS A TROPICAL CYCLONE FORMATION ALERT.// RMKS/ 1. TROPICAL CYCLONE 10S (TEN) WARNING NR 001 01 ACTIVE TROPICAL CYCLONE IN SOUTH IO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 251200Z --- NEAR 17.4S 121.8E MOVEMENT PAST SIX HOURS - 245 DEGREES AT 15 KTS POSITION ACCURATE TO WITHIN 040 NM POSITION BASED ON CENTER LOCATED BY A COMBINATION OF SATELLITE, RADAR AND SYNOPTIC DATA PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY REPEAT POSIT: 17.4S 121.8E --- FORECASTS: 12 HRS, VALID AT: 260000Z --- 18.2S 119.4E MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 035 NM NORTHEAST QUADRANT 045 NM SOUTHEAST QUADRANT 040 NM SOUTHWEST QUADRANT 030 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 250 DEG/ 11 KTS --- 24 HRS, VALID AT: 261200Z --- 19.0S 117.3E MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 045 NM NORTHEAST QUADRANT 055 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT 040 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 250 DEG/ 11 KTS --- 36 HRS, VALID AT: 270000Z --- 19.7S 115.1E MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 050 KT WINDS - 040 NM NORTHEAST QUADRANT 045 NM SOUTHEAST QUADRANT 040 NM SOUTHWEST QUADRANT 035 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 065 NM NORTHEAST QUADRANT 085 NM SOUTHEAST QUADRANT 075 NM SOUTHWEST QUADRANT 060 NM NORTHWEST QUADRANT VECTOR TO 48 HR POSIT: 240 DEG/ 15 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 271200Z --- 21.1S 112.3E MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 025 NM NORTHEAST QUADRANT 025 NM SOUTHEAST QUADRANT 025 NM SOUTHWEST QUADRANT 025 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 045 NM NORTHEAST QUADRANT 050 NM SOUTHEAST QUADRANT 045 NM SOUTHWEST QUADRANT 040 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 075 NM NORTHEAST QUADRANT 095 NM SOUTHEAST QUADRANT 085 NM SOUTHWEST QUADRANT 070 NM NORTHWEST QUADRANT VECTOR TO 72 HR POSIT: 225 DEG/ 12 KTS --- 72 HRS, VALID AT: 281200Z --- 24.4S 108.6E MAX SUSTAINED WINDS - 080 KT, GUSTS 100 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 025 NM NORTHEAST QUADRANT 025 NM SOUTHEAST QUADRANT 025 NM SOUTHWEST QUADRANT 025 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 050 NM NORTHEAST QUADRANT 055 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT 045 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 085 NM NORTHEAST QUADRANT 105 NM SOUTHEAST QUADRANT 095 NM SOUTHWEST QUADRANT 080 NM NORTHWEST QUADRANT VECTOR TO 96 HR POSIT: 195 DEG/ 09 KTS --- LONG RANGE OUTLOOK: NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 250 NM ON DAY 4 AND 350 NM ON DAY 5... AND FOR INTENSITY NEAR 20 KT EACH DAY. --- 96 HRS, VALID AT: 291200Z --- 27.9S 107.6E MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL VECTOR TO 120 HR POSIT: 145 DEG/ 10 KTS --- 120 HRS, VALID AT: 301200Z --- 31.2S 110.3E MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL --- REMARKS: 251500Z POSITION NEAR 17.6S 121.2E. TROPICAL CYCLONE (TC) 10S (TEN). LOCATED APPROXIMATELY 525 NM EAST-NORTHEAST OF LEARMONTH, AUSTRALIA, HAS TRACKED WEST- SOUTHWESTWARD AT 15 KNOTS OVER THE PAST SIX HOURS. ANIMATED WATER VAPOR IMAGERY SHOWS CONVECTION HAS DEEPENED AND CONSOLIDATED AROUND THE LOW LEVEL CIRCULATION CENTER AS THE SYSTEM HAS MOVED OFF THE COASTLINE INTO THE SOUTH INDIAN OCEAN OFF BROOME. THE SAME ANIMATION SHOWS GOOD EQUATORWARD AND IMPROVING POLEWARD OUTFLOW. THE CURRENT INTENSITY IS EXTRAPOLATED FROM A SURFACE OBSERVATION OF 30 KTS/996 MB JUST TO THE NORTH OF THE LLCC. THE CURRENT POSITION IS BASED ON ANIMATED RADAR IMAGERY FROM BROOME. UPPER LEVEL ANALYSIS INDICATES THE SYSTEM IS JUST TO THE SOUTH OF A POINT SOURCE AND TO THE NORTH OF A RIDGE AXIS ORIENTED WEST-EAST ALONG 23S LATITUDE. TC 10S IS UNDER THE STEERING INFLUENCE OF A DEEP-LAYERED SUBTROPICAL RIDGE TO THE SOUTHEAST ANCHORED OVER CENTRAL AUSTRALIA. IT IS EXPECTED TO CONTINUE TRACKING WEST-SOUTHWESTWARD AND GRADUALLY INTENSIFY OVER THE NEXT 72 HOURS AS VERTICAL WIND SHEAR DECREASES TOWARDS THE RIDGE AXIS. THE AVAILABLE NUMERICAL GUIDANCE ARE IN FAIR AGREEMENT WITH THE SOLE EXCEPTION OF WBAR, WHICH UNREALISTICALLY TRACKS THE SYSTEM INLAND INTO THE RIDGE. THIS WARNING SUPERSEDES AND CANCELS REF A, NAVMARFCSTCEN 241221Z JAN 11 TROPICAL CYCLONE FORMATION ALERT ========================================================================= WTXS33 PGTW 20110126 03:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 10S (BIANCA) WARNING NR 002// RMKS/ 1. TROPICAL CYCLONE 10S (BIANCA) WARNING NR 002 01 ACTIVE TROPICAL CYCLONE IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 260000Z --- NEAR 18.9S 119.8E MOVEMENT PAST SIX HOURS - 225 DEGREES AT 14 KTS POSITION ACCURATE TO WITHIN 040 NM POSITION BASED ON CENTER LOCATED BY A COMBINATION OF SATELLITE AND RADAR PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT 060 NM SOUTHEAST QUADRANT 060 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT REPEAT POSIT: 18.9S 119.8E --- FORECASTS: 12 HRS, VALID AT: 261200Z --- 19.9S 117.4E MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 050 KT WINDS - 030 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 030 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 055 NM NORTHEAST QUADRANT 065 NM SOUTHEAST QUADRANT 065 NM SOUTHWEST QUADRANT 055 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 240 DEG/ 12 KTS --- 24 HRS, VALID AT: 270000Z --- 21.1S 115.2E MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 020 NM NORTHEAST QUADRANT 020 NM SOUTHEAST QUADRANT 020 NM SOUTHWEST QUADRANT 020 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 035 NM NORTHEAST QUADRANT 035 NM SOUTHEAST QUADRANT 035 NM SOUTHWEST QUADRANT 035 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT 070 NM SOUTHEAST QUADRANT 070 NM SOUTHWEST QUADRANT 060 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 240 DEG/ 13 KTS --- 36 HRS, VALID AT: 271200Z --- 22.3S 112.8E MAX SUSTAINED WINDS - 090 KT, GUSTS 110 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 020 NM NORTHEAST QUADRANT 020 NM SOUTHEAST QUADRANT 020 NM SOUTHWEST QUADRANT 020 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 035 NM NORTHEAST QUADRANT 035 NM SOUTHEAST QUADRANT 035 NM SOUTHWEST QUADRANT 035 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT 070 NM SOUTHEAST QUADRANT 070 NM SOUTHWEST QUADRANT 060 NM NORTHWEST QUADRANT VECTOR TO 48 HR POSIT: 230 DEG/ 13 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 280000Z --- 24.0S 110.6E MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 025 NM NORTHEAST QUADRANT 000 NM SOUTHEAST QUADRANT 000 NM SOUTHWEST QUADRANT 000 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 035 NM NORTHEAST QUADRANT 035 NM SOUTHEAST QUADRANT 035 NM SOUTHWEST QUADRANT 035 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT 070 NM SOUTHEAST QUADRANT 070 NM SOUTHWEST QUADRANT 060 NM NORTHWEST QUADRANT VECTOR TO 72 HR POSIT: 195 DEG/ 13 KTS --- 72 HRS, VALID AT: 290000Z --- 29.2S 109.0E MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL RADIUS OF 050 KT WINDS - 030 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 030 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT 070 NM SOUTHEAST QUADRANT 060 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT VECTOR TO 96 HR POSIT: 150 DEG/ 13 KTS --- LONG RANGE OUTLOOK: NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 250 NM ON DAY 4 AND 350 NM ON DAY 5... AND FOR INTENSITY NEAR 20 KT EACH DAY. --- 96 HRS, VALID AT: 300000Z --- 33.5S 112.0E MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL --- REMARKS: 260300Z POSITION NEAR 19.2S 119.2E. TROPICAL CYCLONE (TC) 10S (BIANCA). LOCATED APPROXIMATELY 380 NM EAST-NORTHEAST OF LEARMONTH, AUSTRALIA, HAS TRACKED SOUTHWESTWARD AT 14 KNOTS OVER THE PAST SIX HOURS. BECAUSE OF THE SOUTHWESTWARD TRACK OVER THE PAST 06 HOURS, THE TRACK HAS BEEN SHIFTED SOUTH RESULTING IN A CLOSER CPA TO LEARMONTH (36 NM NORTH AT 27/07Z); THE TIMING REMAINS CONSISTENT WITH THE PREVIOUS WARNING. ANIMATED MULTISPECTRAL SATELLITE IMAGERY AND RADAR IMAGERY DEPICT A RAPIDLY CONSOLIDATING LOW-LEVEL CIRCULATION CENTER (LLCC) WITH TIGHTLY-CURVED BANDING AND A WELL DEFINED CENTER. A 260109Z TRMM 37 GHZ IMAGE SHOWS A MICROWAVE EYE FEATURE SURROUNDED BY A LOW-LEVEL SYMMETRIC RING SIGNATURE TYPICAL OF RAPIDLY INTENSIFYING SYSTEMS. THE CURRENT INTENSITY IS BASED ON DVORAK ESTIMATES RANGING FROM 35 TO 55 KNOTS AS WELL AS ON 26/00-01Z SURFACE OBSERVATIONS FROM BEDOUT ISLAND, LOCATED 60 NM SOUTHWEST OF THE CENTER, INDICATE SUSTAINED EASTERLY WINDS OF 39-47 KNOTS WITH 995 MB SLP. TC 10S IS EXPECTED TO TRACK WEST- SOUTHWESTWARD TO SOUTHWESTWARD THROUGH TAU 48 UNDER THE STEERING INFLUENCE OF A DEEP SUBTROPICAL RIDGE (STR) POSITIONED OVER WESTERN AUSTRALIA. AFTER TAU 48, THE SYSTEM WILL RE-CURVE SOUTHWARD AHEAD OF A DEEP MIDLATITUDE SHORTWAVE TROUGH. MODEL GUIDANCE IS IN GOOD AGREEMENT OVERALL WITH THE EXCEPTION OF GFDN, WHICH ERRONEOUSLY TRACKS THE SYSTEM SOUTHWARD INTO THE STR AND RAPIDLY WEAKENS THE SYSTEM OVER LAND. THIS FORECAST IS POSITIONED SLIGHTLY WEST OF THE MODEL CONSENSUS (NOGAPS, GFS, ECMWF, UKMO, WBAR AND GFDN) DUE TO THE POOR GFDN TRACK WHICH IS WELL EAST AND OUTSIDE THE AIDS ENVELOPE. BASED ON THE HIGH SST AND OCEAN HEAT CONTENT VALUES, AND EXCELLENT OUTFLOW THROUGH TAU 36, TC 10S IS FORECAST TO INTENSIFY AT 30 KNOT PER DAY RATE WITH A PEAK OF 90 KNOTS BY TAU 36. AFTER TAU 36, THE SYSTEM WILL BEGIN TO MOVE OVER COOLER SST AND ENCOUNTER HIGH VERTICAL WIND SHEAR ASSOCIATED WITH THE MIDLATITUDE TROUGH. TC 10S WILL BEGIN EXTRA-TROPICAL TRANSITION (ETT) NEAR TAU 72 AND COMPLETE ETT BY TAU 96. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 260000Z IS 11 FEET. NEXT WARNINGS AT 260900Z, 261500Z, 262100Z AND 270300Z.// ========================================================================= WTXS33 PGTW 20110126 09:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 10S (BIANCA) WARNING NR 003// RMKS/ 1. TROPICAL CYCLONE 10S (BIANCA) WARNING NR 003 01 ACTIVE TROPICAL CYCLONE IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 260600Z --- NEAR 19.5S 118.3E MOVEMENT PAST SIX HOURS - 245 DEGREES AT 15 KTS POSITION ACCURATE TO WITHIN 020 NM POSITION BASED ON CENTER LOCATED BY A COMBINATION OF SATELLITE AND RADAR PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 050 KT WINDS - 010 NM NORTHEAST QUADRANT 010 NM SOUTHEAST QUADRANT 010 NM SOUTHWEST QUADRANT 010 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 055 NM NORTHEAST QUADRANT 065 NM SOUTHEAST QUADRANT 065 NM SOUTHWEST QUADRANT 055 NM NORTHWEST QUADRANT REPEAT POSIT: 19.5S 118.3E --- FORECASTS: 12 HRS, VALID AT: 261800Z --- 20.5S 116.0E MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 050 KT WINDS - 030 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 030 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 055 NM NORTHEAST QUADRANT 065 NM SOUTHEAST QUADRANT 065 NM SOUTHWEST QUADRANT 055 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 240 DEG/ 12 KTS --- 24 HRS, VALID AT: 270600Z --- 21.7S 113.7E MAX SUSTAINED WINDS - 080 KT, GUSTS 100 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 020 NM NORTHEAST QUADRANT 020 NM SOUTHEAST QUADRANT 020 NM SOUTHWEST QUADRANT 020 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 035 NM NORTHEAST QUADRANT 035 NM SOUTHEAST QUADRANT 035 NM SOUTHWEST QUADRANT 035 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT 070 NM SOUTHEAST QUADRANT 070 NM SOUTHWEST QUADRANT 060 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 235 DEG/ 13 KTS --- 36 HRS, VALID AT: 271800Z --- 23.2S 111.5E MAX SUSTAINED WINDS - 090 KT, GUSTS 110 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 020 NM NORTHEAST QUADRANT 020 NM SOUTHEAST QUADRANT 020 NM SOUTHWEST QUADRANT 020 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 035 NM NORTHEAST QUADRANT 035 NM SOUTHEAST QUADRANT 035 NM SOUTHWEST QUADRANT 035 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT 070 NM SOUTHEAST QUADRANT 070 NM SOUTHWEST QUADRANT 060 NM NORTHWEST QUADRANT VECTOR TO 48 HR POSIT: 210 DEG/ 13 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 280600Z --- 25.4S 110.0E MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 025 NM NORTHEAST QUADRANT 000 NM SOUTHEAST QUADRANT 000 NM SOUTHWEST QUADRANT 000 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 035 NM NORTHEAST QUADRANT 035 NM SOUTHEAST QUADRANT 035 NM SOUTHWEST QUADRANT 035 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT 070 NM SOUTHEAST QUADRANT 070 NM SOUTHWEST QUADRANT 060 NM NORTHWEST QUADRANT VECTOR TO 72 HR POSIT: 185 DEG/ 12 KTS --- 72 HRS, VALID AT: 290600Z --- 30.3S 109.6E MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL RADIUS OF 050 KT WINDS - 030 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 030 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 065 NM NORTHEAST QUADRANT 085 NM SOUTHEAST QUADRANT 075 NM SOUTHWEST QUADRANT 065 NM NORTHWEST QUADRANT VECTOR TO 96 HR POSIT: 145 DEG/ 13 KTS --- LONG RANGE OUTLOOK: NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 250 NM ON DAY 4 AND 350 NM ON DAY 5... AND FOR INTENSITY NEAR 20 KT EACH DAY. --- 96 HRS, VALID AT: 300600Z --- 34.4S 113.3E MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL --- REMARKS: 260900Z POSITION NEAR 19.8S 117.7E. TROPICAL CYCLONE (TC) 10S (BIANCA), LOCATED APPROXIMATELY 290 NM NORTHEAST OF LEARMONTH, AUSTRALIA, HAS TRACKED SOUTHWESTWARD AT 15 KNOTS OVER THE PAST SIX HOURS. ANIMATED MULTISPECTRAL IMAGERY SHOWS THE SYSTEM HAS SIGNIFICANTLY DEEPENED AND CONSOLIDATED AS RADIAL OUTFLOW CONTINUES TO IMPROVE. THE CURRENT POSITION IS BASED ON ANIMATED RADAR IMAGERY FROM PORT HEDLAND, AUSTRALIA, DEPICTING A WELL-DEFINED LOW LEVEL CIRCULATION CENTER (LLCC) SURROUNDED BY HIGHLY REFLECTIVE CONVECTION. THE CURRENT INTENSITY IS SUPPORTED BY DVORAK INTENSITY ESTIMATES RANGING FROM 50 TO 65 KNOTS. UPPER LEVEL ANALYSIS INDICATES THE SYSTEM IS TRACKING TOWARDS A RIDGE AXIS IN AN AREA OF DECREASING VERTICAL WIND SHEAR (VWS). TC 10S IS UNDER THE STEERING INFLUENCE OF A DEEP-LAYERED SUBTROPICAL RIDGE OVER SOUTH-CENTRAL AUSTRALIA. IT IS EXPECTED TO CONTINUE ALONG ITS TRACK AND FURTHER INTENSIFY UP TO TAU 36 BEFORE IT BEGINS TO RECURVE TO THE SOUTHEAST IN RESPONSE TO AN APPROACHING MID-LATITUDE TROUGH. AT THAT POINT, HIGHER VWS ASSOCIATED WITH THE STRONG WESTERLIES WILL BEGIN TO ERODE THE SYSTEM AS IT ACCELERATES TOWARDS EXTRA-TROPICAL TRANSITION (ET). CONCURRENTLY, COOLER SEA SURFACE TEMPERATURES WILL RAPIDLY WEAKEN THE SYSTEM. TC BIANCA WILL COMPLETE ET BY TAU 72. THE AVAILABLE NUMERICAL GUIDANCE ARE IN CLOSE AGREEMENT WITH THIS TRACK FORECAST, WITH THE EXCEPTION OF GFDN ERRONEOUSLY REVERSING TRACK AT TAU 48 AND CONSEQUENTLY SKEWING THE CONSENSUS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 260600Z IS 12 FEET. NEXT WARNINGS AT 261500Z, 262100Z, 270300Z AND 270900Z.// ========================================================================= WTXS33 PGTW 20110126 15:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 10S (BIANCA) WARNING NR 004// RMKS/ 1. TROPICAL CYCLONE 10S (BIANCA) WARNING NR 004 01 ACTIVE TROPICAL CYCLONE IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 261200Z --- NEAR 19.5S 116.8E MOVEMENT PAST SIX HOURS - 270 DEGREES AT 14 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY A COMBINATION OF SATELLITE AND RADAR PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 050 KT WINDS - 010 NM NORTHEAST QUADRANT 015 NM SOUTHEAST QUADRANT 010 NM SOUTHWEST QUADRANT 010 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT 075 NM SOUTHEAST QUADRANT 070 NM SOUTHWEST QUADRANT 060 NM NORTHWEST QUADRANT REPEAT POSIT: 19.5S 116.8E --- FORECASTS: 12 HRS, VALID AT: 270000Z --- 20.5S 114.5E MAX SUSTAINED WINDS - 070 KT, GUSTS 085 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 050 KT WINDS - 030 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 030 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 055 NM NORTHEAST QUADRANT 065 NM SOUTHEAST QUADRANT 065 NM SOUTHWEST QUADRANT 055 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 235 DEG/ 12 KTS --- 24 HRS, VALID AT: 271200Z --- 21.9S 112.3E MAX SUSTAINED WINDS - 080 KT, GUSTS 100 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 020 NM NORTHEAST QUADRANT 020 NM SOUTHEAST QUADRANT 020 NM SOUTHWEST QUADRANT 020 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 035 NM NORTHEAST QUADRANT 035 NM SOUTHEAST QUADRANT 035 NM SOUTHWEST QUADRANT 035 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT 070 NM SOUTHEAST QUADRANT 070 NM SOUTHWEST QUADRANT 060 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 220 DEG/ 12 KTS --- 36 HRS, VALID AT: 280000Z --- 23.7S 110.5E MAX SUSTAINED WINDS - 085 KT, GUSTS 105 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 020 NM NORTHEAST QUADRANT 020 NM SOUTHEAST QUADRANT 020 NM SOUTHWEST QUADRANT 020 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 035 NM NORTHEAST QUADRANT 035 NM SOUTHEAST QUADRANT 035 NM SOUTHWEST QUADRANT 035 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT 070 NM SOUTHEAST QUADRANT 070 NM SOUTHWEST QUADRANT 060 NM NORTHWEST QUADRANT VECTOR TO 48 HR POSIT: 195 DEG/ 12 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 281200Z --- 26.0S 109.7E MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL RADIUS OF 064 KT WINDS - 025 NM NORTHEAST QUADRANT 000 NM SOUTHEAST QUADRANT 000 NM SOUTHWEST QUADRANT 000 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 035 NM NORTHEAST QUADRANT 035 NM SOUTHEAST QUADRANT 035 NM SOUTHWEST QUADRANT 035 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 070 NM NORTHEAST QUADRANT 080 NM SOUTHEAST QUADRANT 080 NM SOUTHWEST QUADRANT 070 NM NORTHWEST QUADRANT VECTOR TO 72 HR POSIT: 160 DEG/ 17 KTS --- 72 HRS, VALID AT: 291200Z --- 32.6S 112.3E MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL --- REMARKS: 261500Z POSITION NEAR 19.8S 116.2E. TROPICAL CYCLONE (TC) 10S (BIANCA), LOCATED APPROXIMATELY 225 NM NORTHEAST OF LEARMONTH, AUSTRALIA, HAS TRACKED WESTWARD AT 14 KTS OVER THE PAST SIX HOURS. ANIMATED WATER VAPOR IMAGERY SHOWS THE SYSTEM HAS FURTHER DEEPENED AND CONSOLIDATED AS RADIAL OUTFLOW CONTINUES TO IMPROVE. THE CURRENT POSITION IS BASED ON ANIMATED RADAR IMAGERY FROM PORT HEDLAND, AUSTRALIA, DEPICTING A WELL-DEFINED LOW LEVEL CIRCULATION CENTER (LLCC) SURROUNDED BY HIGHLY REFLECTIVE CONVECTION. THE CURRENT INTENSITY IS SUPPORTED BY DVORAK INTENSITY ESTIMATES RANGING FROM 50 TO 65 KNOTS. UPPER LEVEL ANALYSIS INDICATES THE SYSTEM IS TRACKING TOWARDS A RIDGE AXIS IN AN AREA OF DECREASING VERTICAL WIND SHEAR (VWS). TC 10S IS UNDER THE STEERING INFLUENCE OF A DEEP-LAYERED SUBTROPICAL RIDGE OVER SOUTH-CENTRAL AUSTRALIA. IT IS EXPECTED TO CONTINUE ALONG ITS TRACK AND FURTHER INTENSIFY UP TO TAU 36 BEFORE IT BEGINS TO RECURVE TO THE SOUTHEAST IN RESPONSE TO AN APPROACHING MID-LATITUDE TROUGH. AT THAT POINT, HIGHER VWS ASSOCIATED WITH THE STRONG WESTERLIES WILL BEGIN TO ERODE THE SYSTEM AS IT ACCELERATES TOWARDS EXTRA-TROPICAL TRANSITION (ET). ADDITIONALLY, COOLER SEA SURFACE TEMPERATURES WILL RAPIDLY WEAKEN THE SYSTEM. TC BIANCA WILL COMPLETE ET BY TAU 72. THE AVAILABLE NUMERICAL GUIDANCE ARE IN CLOSE AGREEMENT WITH THIS TRACK FORECAST, WITH THE EXCEPTION OF GFDN ERRONEOUSLY REVERSING TRACK AT TAU 36 AND CONSEQUENTLY SKEWING THE CONSENSUS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 261200Z IS 13 FEET. NEXT WARNINGS AT 262100Z, 270300Z, 270900Z AND 271500Z.// ========================================================================= WTXS33 PGTW 20110126 21:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 10S (BIANCA) WARNING NR 005// RMKS/ 1. TROPICAL CYCLONE 10S (BIANCA) WARNING NR 005 01 ACTIVE TROPICAL CYCLONE IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 261800Z --- NEAR 19.4S 115.9E MOVEMENT PAST SIX HOURS - 275 DEGREES AT 10 KTS POSITION ACCURATE TO WITHIN 040 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 050 KT WINDS - 040 NM NORTHEAST QUADRANT 035 NM SOUTHEAST QUADRANT 035 NM SOUTHWEST QUADRANT 040 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 090 NM NORTHEAST QUADRANT 080 NM SOUTHEAST QUADRANT 075 NM SOUTHWEST QUADRANT 090 NM NORTHWEST QUADRANT REPEAT POSIT: 19.4S 115.9E --- FORECASTS: 12 HRS, VALID AT: 270600Z --- 20.7S 113.8E MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 025 NM NORTHEAST QUADRANT 025 NM SOUTHEAST QUADRANT 025 NM SOUTHWEST QUADRANT 025 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 045 NM NORTHEAST QUADRANT 045 NM SOUTHEAST QUADRANT 045 NM SOUTHWEST QUADRANT 040 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 100 NM NORTHEAST QUADRANT 100 NM SOUTHEAST QUADRANT 100 NM SOUTHWEST QUADRANT 090 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 230 DEG/ 12 KTS --- 24 HRS, VALID AT: 271800Z --- 22.2S 111.9E MAX SUSTAINED WINDS - 080 KT, GUSTS 100 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 030 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 030 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 045 NM NORTHEAST QUADRANT 050 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 095 NM NORTHEAST QUADRANT 105 NM SOUTHEAST QUADRANT 105 NM SOUTHWEST QUADRANT 105 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 210 DEG/ 12 KTS --- 36 HRS, VALID AT: 280600Z --- 24.2S 110.6E MAX SUSTAINED WINDS - 085 KT, GUSTS 105 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 035 NM NORTHEAST QUADRANT 035 NM SOUTHEAST QUADRANT 035 NM SOUTHWEST QUADRANT 030 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 055 NM NORTHEAST QUADRANT 055 NM SOUTHEAST QUADRANT 055 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 110 NM NORTHEAST QUADRANT 110 NM SOUTHEAST QUADRANT 110 NM SOUTHWEST QUADRANT 100 NM NORTHWEST QUADRANT VECTOR TO 48 HR POSIT: 190 DEG/ 12 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 281800Z --- 26.6S 110.1E MAX SUSTAINED WINDS - 070 KT, GUSTS 085 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL RADIUS OF 064 KT WINDS - 035 NM NORTHEAST QUADRANT 035 NM SOUTHEAST QUADRANT 035 NM SOUTHWEST QUADRANT 030 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 055 NM NORTHEAST QUADRANT 055 NM SOUTHEAST QUADRANT 055 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 110 NM NORTHEAST QUADRANT 110 NM SOUTHEAST QUADRANT 110 NM SOUTHWEST QUADRANT 100 NM NORTHWEST QUADRANT VECTOR TO 72 HR POSIT: 155 DEG/ 20 KTS --- 72 HRS, VALID AT: 291800Z --- 33.9S 114.1E MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL --- REMARKS: 262100Z POSITION NEAR 19.7S 115.4E. TROPICAL CYCLONE (TC) 10S (BIANCA), LOCATED APPROXIMATELY 200 NM NORTH-NORTHEAST OF LEARMONTH, AUSTRALIA, HAS TRACKED WESTWARD AT 10 KNOTS OVER THE PAST SIX HOURS. RADAR FROM DAMPIER, AUSTRALIA AND ANIMATED INFRARED SATELLITE IMAGERY SHOW A TIGHTLY WRAPPED, WELL- DEFINED LOW LEVEL CIRCULATION CENTER. A 261806Z AMSU MICROWAVE IMAGE DEPICTS AN EYE WITH THE DEEPEST CONVECTION ALONG THE WESTERN AND NORTHERN PERIPHERIES. THERE IS GOOD CONFIDENCE IN THE INITIAL POSITION, WHICH WAS BASED ON THE RADAR. THE INITIAL INTENSITY IS BASED ON PGTW, KNES, AND APRF DVORAK ESTIMATES RANGING FROM 55 TO 77 KNOTS. UPPER LEVEL ANALYSIS INDICATES FAVORABLE UPPER LEVEL DIVERGENCE AND POLEWARD OUTFLOW INTO AN UPPER LEVEL MID-LATITUDE TROUGH TO THE SOUTHEAST. TC 10S IS CURRENTLY TRACKING ALONG THE NORTHWESTERN PERIPHERY OF A SUBTROPICAL STEERING RIDGE CENTERED OVER AUSTRALIA. AROUND TAU 36, AN UPPER LEVEL, MID-LATITUDE TROUGH IS EXPECTED TO WEAKEN THE STEERING RIDGE AND TURN THE SYSTEM SOUTHWARD. THE SYSTEM IS EXPECTED TO THEN RECURVE INTO THE MID-LATITUDE WESTERLIES AND COMPLETE EXTRA-TROPICAL TRANSITION BY TAU 72. AVAILABLE NUMERICAL MODEL GUIDANCE IS IN GOOD AGREEMENT WITH THIS FORECAST. TC BIANCA IS EXPECTED TO CONTINUE TO INTENSIFY UNDER IMPROVED OUFTLOW AND OCEANIC CONDITIONS. AFTER TAU 36, THE SYSTEM SHOULD BEGIN TO WEAKEN AS SEA SURFACE TEMPERATURES DROP BELOW 26 DEGREES CELSIUS AND VERTICAL WIND SHEAR INCREASES. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 261800Z IS 15 FEET. NEXT WARNINGS AT 270300Z, 270900Z, 271500Z AND 272100Z.// ========================================================================= WTXS33 PGTW 20110127 03:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 10S (BIANCA) WARNING NR 006// RMKS/ 1. TROPICAL CYCLONE 10S (BIANCA) WARNING NR 006 01 ACTIVE TROPICAL CYCLONE IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 270000Z --- NEAR 19.8S 115.0E MOVEMENT PAST SIX HOURS - 260 DEGREES AT 10 KTS POSITION ACCURATE TO WITHIN 040 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 050 KT WINDS - 040 NM NORTHEAST QUADRANT 035 NM SOUTHEAST QUADRANT 040 NM SOUTHWEST QUADRANT 040 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 090 NM NORTHEAST QUADRANT 080 NM SOUTHEAST QUADRANT 090 NM SOUTHWEST QUADRANT 090 NM NORTHWEST QUADRANT REPEAT POSIT: 19.8S 115.0E --- FORECASTS: 12 HRS, VALID AT: 271200Z --- 20.8S 113.0E MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 025 NM NORTHEAST QUADRANT 025 NM SOUTHEAST QUADRANT 025 NM SOUTHWEST QUADRANT 025 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 040 NM NORTHEAST QUADRANT 050 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT 040 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 100 NM NORTHEAST QUADRANT 110 NM SOUTHEAST QUADRANT 110 NM SOUTHWEST QUADRANT 090 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 225 DEG/ 14 KTS --- 24 HRS, VALID AT: 280000Z --- 22.8S 111.0E MAX SUSTAINED WINDS - 085 KT, GUSTS 105 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 025 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 025 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 045 NM NORTHEAST QUADRANT 055 NM SOUTHEAST QUADRANT 055 NM SOUTHWEST QUADRANT 045 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 105 NM NORTHEAST QUADRANT 115 NM SOUTHEAST QUADRANT 115 NM SOUTHWEST QUADRANT 105 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 210 DEG/ 14 KTS --- 36 HRS, VALID AT: 281200Z --- 25.2S 109.5E MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 025 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 025 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 045 NM NORTHEAST QUADRANT 055 NM SOUTHEAST QUADRANT 055 NM SOUTHWEST QUADRANT 045 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 105 NM NORTHEAST QUADRANT 115 NM SOUTHEAST QUADRANT 115 NM SOUTHWEST QUADRANT 105 NM NORTHWEST QUADRANT VECTOR TO 48 HR POSIT: 195 DEG/ 14 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 290000Z --- 27.9S 108.7E MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL RADIUS OF 050 KT WINDS - 050 NM NORTHEAST QUADRANT 055 NM SOUTHEAST QUADRANT 055 NM SOUTHWEST QUADRANT 045 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 115 NM NORTHEAST QUADRANT 115 NM SOUTHEAST QUADRANT 115 NM SOUTHWEST QUADRANT 105 NM NORTHWEST QUADRANT VECTOR TO 72 HR POSIT: 150 DEG/ 22 KTS --- 72 HRS, VALID AT: 300000Z --- 35.1S 114.3E MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL --- REMARKS: 270300Z POSITION NEAR 20.1S 114.5E. TROPICAL CYCLONE (TC) 10S (BIANCA), LOCATED APPROXIMATELY 150 NM NORTH-NORTHEAST OF LEARMONTH, AUSTRALIA, HAS TRACKED WESTWARD AT 10 KNOTS OVER THE PAST SIX HOURS. RADAR FROM DAMPIER, AUSTRALIA AND ANIMATED MULTISPECTRAL SATELLITE IMAGERY SHOW A TIGHTLY WRAPPED, WELL-DEFINED LOW LEVEL CIRCULATION CENTER. THE INITIAL POSITION WAS BASED ON THE RADAR WITH GOOD CONFIDENCE. THE INITIAL INTENSITY WAS BASED ON PGTW, KNES, AND APRF DVORAK ESTIMATES RANGING FROM 55 TO 77 KNOTS. UPPER LEVEL ANALYSIS INDICATES BOTH FAVORABLE EQUATORWARD AND POLEWARD OUFLOW INTO AN UPPER LEVEL MID-LATITUDE TROUGH TO THE SOUTHEAST. TC 10S IS CURRENTLY TRACKING ALONG THE NORTHWESTERN PERIPHERY OF A SUBTROPICAL STEERING RIDGE CENTERED OVER AUSTRALIA. AROUND TAU 36, AN UPPER LEVEL, MID-LATITUDE TROUGH IS EXPECTED TO WEAKEN THE STEERING RIDGE AND TURN THE SYSTEM SOUTHWARD. TC BIANCA IS EXPECTED TO THEN RECURVE INTO THE MID-LATITUDE WESTERLIES AND COMPLETE EXTRA-TROPICAL TRANSITION BY TAU 72. AVAILABLE NUMERICAL MODEL GUIDANCE IS IN GOOD AGREEMENT WITH THIS FORECAST. TC BIANCA IS EXPECTED TO CONTINUE TO INTENSIFY UNDER IMPROVED OUFTLOW AND OCEANIC CONDITIONS. AROUND TAU 36, THE SYSTEM SHOULD BEGIN TO WEAKEN AS SEA SURFACE TEMPERATURES DROP BELOW 26 DEGREES CELSIUS AND VERTICAL WIND SHEAR INCREASES. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 270000Z IS 18 FEET. NEXT WARNINGS AT 270900Z, 271500Z, 272100Z AND 280300Z.// ========================================================================= WTXS33 PGTW 20110127 09:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 10S (BIANCA) WARNING NR 007// RMKS/ 1. TROPICAL CYCLONE 10S (BIANCA) WARNING NR 007 01 ACTIVE TROPICAL CYCLONE IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 270600Z --- NEAR 20.4S 113.9E MOVEMENT PAST SIX HOURS - 240 DEGREES AT 12 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY A COMBINATION OF SATELLITE AND RADAR PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 050 KT WINDS - 040 NM NORTHEAST QUADRANT 055 NM SOUTHEAST QUADRANT 055 NM SOUTHWEST QUADRANT 040 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 090 NM NORTHEAST QUADRANT 110 NM SOUTHEAST QUADRANT 110 NM SOUTHWEST QUADRANT 090 NM NORTHWEST QUADRANT REPEAT POSIT: 20.4S 113.9E --- FORECASTS: 12 HRS, VALID AT: 271800Z --- 21.8S 111.9E MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 025 NM NORTHEAST QUADRANT 025 NM SOUTHEAST QUADRANT 025 NM SOUTHWEST QUADRANT 025 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 040 NM NORTHEAST QUADRANT 065 NM SOUTHEAST QUADRANT 065 NM SOUTHWEST QUADRANT 040 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 095 NM NORTHEAST QUADRANT 125 NM SOUTHEAST QUADRANT 125 NM SOUTHWEST QUADRANT 095 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 220 DEG/ 14 KTS --- 24 HRS, VALID AT: 280600Z --- 24.0S 109.9E MAX SUSTAINED WINDS - 080 KT, GUSTS 100 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 025 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 025 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 045 NM NORTHEAST QUADRANT 055 NM SOUTHEAST QUADRANT 055 NM SOUTHWEST QUADRANT 045 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 105 NM NORTHEAST QUADRANT 115 NM SOUTHEAST QUADRANT 115 NM SOUTHWEST QUADRANT 105 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 205 DEG/ 14 KTS --- 36 HRS, VALID AT: 281800Z --- 26.5S 108.5E MAX SUSTAINED WINDS - 070 KT, GUSTS 085 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL RADIUS OF 064 KT WINDS - 030 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 025 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 065 NM NORTHEAST QUADRANT 065 NM SOUTHEAST QUADRANT 065 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 095 NM NORTHEAST QUADRANT 095 NM SOUTHEAST QUADRANT 095 NM SOUTHWEST QUADRANT 085 NM NORTHWEST QUADRANT VECTOR TO 48 HR POSIT: 175 DEG/ 15 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 290600Z --- 29.4S 108.8E MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL RADIUS OF 050 KT WINDS - 055 NM NORTHEAST QUADRANT 055 NM SOUTHEAST QUADRANT 055 NM SOUTHWEST QUADRANT 045 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 085 NM NORTHEAST QUADRANT 085 NM SOUTHEAST QUADRANT 085 NM SOUTHWEST QUADRANT 075 NM NORTHWEST QUADRANT VECTOR TO 72 HR POSIT: 140 DEG/ 25 KTS --- 72 HRS, VALID AT: 300600Z --- 37.0S 116.5E MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL --- REMARKS: 270900Z POSITION NEAR 20.7S 113.4E. TROPICAL CYCLONE (TC) 10S (BIANCA), LOCATED APPROXIMATELY 100 NM NORTH OF LEARMONTH, AUSTRALIA, HAS TRACKED WEST-SOUTHWESTWARD AT 12 KNOTS OVER THE PAST SIX HOURS. ANIMATED MULTISPECTRAL SATELLITE IMAGERY AND A RADAR LOOP FROM LEARMONTH DEPICT TIGHTLY CURVED CONVECTIVE BANDING WRAPPING INTO A 20 NM VISIBLE EYE. THERE IS HIGH CONFIDENCE IN THE CURRENT POSITION BASED ON THE VISIBLE EYE. THE CURRENT INTENSITY IS BASED ON DVORAK ESTIMATES RANGING FROM 55 TO 77 KNOTS FROM PGTW, KNES, AND APRF. WIND RADII ARE BASED ON A 270205Z ASCAT PASS AND OBSERVATIONS FROM LEARMONTH INDICATING WINDS GUSTING UP TO 40 KNOTS. UPPER LEVEL ANALYSIS INDICATES TC 10S IS LOCATED JUST NORTH OF THE RIDGE AXIS IN A REGION OF MODERATE (20 KNOTS) VERTICAL WIND SHEAR AND EXCELLENT RADIAL OUTFLOW. TC BIANCA IS CURRENTLY TRACKING ALONG THE NORTHWESTERN PERIPHERY OF A SUBTROPICAL STEERING RIDGE CENTERED OVER AUSTRALIA. NEAR TAU 36, TC 10S IS FORECAST TO SLOW AND BEGIN TO RECURVE TO THE SOUTHEAST AHEAD OF AN APPROACHING MID-LATITUDE TROUGH. TC BIANCA IS EXPECTED TO BEGIN EXTRA-TROPICAL TRANSITION (ET) AS IT ROUNDS THE RIDGE AXIS AND IS FORECAST TO COMPLETE ET PRIOR TO TAU 72. TC 10S IS FORECAST TO STEADILY INTENSIFY OVER THE NEXT 12 TO 24 HOURS AS POLEWARD OUTFLOW IMPROVES AHEAD OF THE MID-LATITUDE TROUGH AND SEA SURFACE TEMPERATURES REMAIN FAVORABLE, BUT WILL GRADUALLY WEAKEN AFTER TAU 36 AS SEA SURFACE TEMPERATURES BEING TO DROP OFF AND VERTICAL WIND SHEAR INCREASES. NUMERICAL MODEL GUIDANCE IS IN GOOD AGREEMENT WITH THE EXCEPTION OF NGPS AND GFDN WHICH INDICATE A WESTWARD TRACK AFTER TAU 72, WHICH SEEMS UNLIKELY GIVEN THE APPROACHING MID-LATITUDE TROUGH. THIS FORECAST IS CLOSE TO MODEL CONSENSUS THROUGH TAU 48, BUT IS FASTER AT TAU 72 TO ACCOUNT FOR THESE MODEL OUTLIERS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 270600Z IS 20 FEET. NEXT WARNINGS AT 272100Z AND 280900Z.// ========================================================================= WTXS33 PGTW 20110127 15:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 10S (BIANCA) WARNING NR 008// RMKS/ 1. TROPICAL CYCLONE 10S (BIANCA) WARNING NR 008 01 ACTIVE TROPICAL CYCLONE IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 271200Z --- NEAR 20.8S 113.1E MOVEMENT PAST SIX HOURS - 240 DEGREES AT 10 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY A COMBINATION OF SATELLITE AND RADAR PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 050 KT WINDS - 050 NM NORTHEAST QUADRANT 060 NM SOUTHEAST QUADRANT 060 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 100 NM NORTHEAST QUADRANT 120 NM SOUTHEAST QUADRANT 120 NM SOUTHWEST QUADRANT 100 NM NORTHWEST QUADRANT REPEAT POSIT: 20.8S 113.1E --- FORECASTS: 12 HRS, VALID AT: 280000Z --- 22.4S 111.3E MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 025 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 025 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 050 NM NORTHEAST QUADRANT 060 NM SOUTHEAST QUADRANT 060 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 110 NM NORTHEAST QUADRANT 130 NM SOUTHEAST QUADRANT 130 NM SOUTHWEST QUADRANT 110 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 215 DEG/ 13 KTS --- 24 HRS, VALID AT: 281200Z --- 24.5S 109.6E MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 025 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 025 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 050 NM NORTHEAST QUADRANT 060 NM SOUTHEAST QUADRANT 060 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 110 NM NORTHEAST QUADRANT 130 NM SOUTHEAST QUADRANT 130 NM SOUTHWEST QUADRANT 110 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 185 DEG/ 15 KTS --- 36 HRS, VALID AT: 290000Z --- 27.4S 109.2E MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL RADIUS OF 064 KT WINDS - 030 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 025 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 065 NM NORTHEAST QUADRANT 065 NM SOUTHEAST QUADRANT 065 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 095 NM NORTHEAST QUADRANT 095 NM SOUTHEAST QUADRANT 095 NM SOUTHWEST QUADRANT 085 NM NORTHWEST QUADRANT VECTOR TO 48 HR POSIT: 150 DEG/ 18 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 291200Z --- 30.5S 111.4E MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL RADIUS OF 050 KT WINDS - 055 NM NORTHEAST QUADRANT 055 NM SOUTHEAST QUADRANT 055 NM SOUTHWEST QUADRANT 045 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 085 NM NORTHEAST QUADRANT 085 NM SOUTHEAST QUADRANT 085 NM SOUTHWEST QUADRANT 075 NM NORTHWEST QUADRANT VECTOR TO 72 HR POSIT: 120 DEG/ 21 KTS --- 72 HRS, VALID AT: 301200Z --- 34.2S 120.3E MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL --- REMARKS: 271500Z POSITION NEAR 21.2S 112.7E. TROPICAL CYCLONE (TC) 10S (BIANCA), LOCATED APPROXIMATELY 100 NM NORTH-NORTHWEST OF LEARMONTH, AUSTRALIA, HAS TRACKED WEST- SOUTHWESTWARD AT 10 KNOTS OVER THE PAST SIX HOURS. ANIMATED INFRARED SATELLITE IMAGERY, A RADAR LOOP FROM LEARMONTH, AUSTRALIA, AND A 271102Z CORIOLIS 37H MICROWAVE IMAGE SHOW TIGHTLY CURVED CONVECTIVE BANDING WITH A CONCENTRIC EYE-WALL AND MICROWAVE EYE. THERE IS HIGH CONFIDENCE IN THE CURRENT POSITION BASED ON THE AFOREMENTIONED MICROWAVE IMAGE. THE CURRENT INTENSITY IS BASED ON DVORAK ESTIMATES RANGING FROM 55 TO 77 KNOTS FROM PGTW, KNES, AND APRF. UPPER LEVEL ANALYSIS SHOWS GOOD RADIAL OUTFLOW WITH IMPROVED OUTFLOW AHEAD OF A TRANSITORY MID-LATITUDE TROUGH. THE SYSTEM IS CURRENTLY TRACKING ALONG THE NORTHWESTERN PERIPHERY OF A SUBTROPICAL STEERING RIDGE CENTERED OVER AUSTRALIA. TC 10S IS FORECAST TO INTENSIFY SLIGHTLY WITHIN THE NEXT 12 TO 24 HOURS AS OUTFLOW AHEAD OF THE MID-LATITUDE TROUGH CONTINUES TO IMPROVE AND SEA SURFACE TEMPERATURES REMAIN FAVORABLE. TC BIANCA IS EXPECTED TO BEGIN EXTRA-TROPICAL TRANSITION BY 29/00Z AND WILL BE FULLY ABSORBED BY THE MID-LATITUDE WESTERLIES BY 20/12Z. NUMERICAL MODEL GUIDANCE IS TIGHTLY PACKED, WITH THE EXCEPTION OF NGPS AND GFDN WHICH CONTINUE TO TRACK THE SYSTEM SOUTHWESTWARD INTO THE APPROACHING UPPER LEVEL TROUGH. BASED ON THESE MODEL INCONSISTENCIES, THE CURRENT FORECAST TRACK IS SLIGHTLY LEFT AND FASTER THEN MODEL CONSENSUS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 271200Z IS 23 FEET. NEXT WARNINGS AT 280300Z AND 281500Z.// ========================================================================= WTXS33 PGTW 20110127 21:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 10S (BIANCA) WARNING NR 009// RMKS/ 1. TROPICAL CYCLONE 10S (BIANCA) WARNING NR 009 01 ACTIVE TROPICAL CYCLONE IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 271800Z --- NEAR 22.2S 111.6E MOVEMENT PAST SIX HOURS - 225 DEGREES AT 15 KTS POSITION ACCURATE TO WITHIN 040 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 090 KT, GUSTS 110 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 030 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 030 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 090 NM NORTHEAST QUADRANT 090 NM SOUTHEAST QUADRANT 080 NM SOUTHWEST QUADRANT 090 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 140 NM NORTHEAST QUADRANT 140 NM SOUTHEAST QUADRANT 130 NM SOUTHWEST QUADRANT 140 NM NORTHWEST QUADRANT REPEAT POSIT: 22.2S 111.6E --- FORECASTS: 12 HRS, VALID AT: 280600Z --- 24.7S 109.5E MAX SUSTAINED WINDS - 100 KT, GUSTS 125 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 035 NM NORTHEAST QUADRANT 035 NM SOUTHEAST QUADRANT 035 NM SOUTHWEST QUADRANT 030 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 065 NM NORTHEAST QUADRANT 065 NM SOUTHEAST QUADRANT 065 NM SOUTHWEST QUADRANT 055 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 135 NM NORTHEAST QUADRANT 135 NM SOUTHEAST QUADRANT 135 NM SOUTHWEST QUADRANT 115 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 195 DEG/ 13 KTS --- 24 HRS, VALID AT: 281800Z --- 27.3S 108.7E MAX SUSTAINED WINDS - 085 KT, GUSTS 105 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 035 NM NORTHEAST QUADRANT 035 NM SOUTHEAST QUADRANT 035 NM SOUTHWEST QUADRANT 030 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 065 NM NORTHEAST QUADRANT 065 NM SOUTHEAST QUADRANT 065 NM SOUTHWEST QUADRANT 055 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 135 NM NORTHEAST QUADRANT 135 NM SOUTHEAST QUADRANT 135 NM SOUTHWEST QUADRANT 115 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 165 DEG/ 13 KTS --- 36 HRS, VALID AT: 290600Z --- 29.8S 109.6E MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL RADIUS OF 050 KT WINDS - 065 NM NORTHEAST QUADRANT 065 NM SOUTHEAST QUADRANT 055 NM SOUTHWEST QUADRANT 055 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 135 NM NORTHEAST QUADRANT 135 NM SOUTHEAST QUADRANT 125 NM SOUTHWEST QUADRANT 115 NM NORTHWEST QUADRANT VECTOR TO 48 HR POSIT: 130 DEG/ 17 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 291800Z --- 31.9S 112.7E MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL --- REMARKS: 272100Z POSITION NEAR 22.8S 111.1E. TROPICAL CYCLONE (TC) 10S (BIANCA), LOCATED APPROXIMATELY 100 NM NORTHWEST OF LEARMONTH, AUSTRALIA, HAS TRACKED SOUTHWESTWARD AT 15 KNOTS OVER THE PAST SIX HOURS. ANIMATED INFRARED SATELLITE IMAGERY AND A RADAR LOOP FROM LEARMONTH, AUSTRALIA SHOW SIGNIFICANTLY IMPROVED DEEP CONVECTIVE BANDING WRAPPING INTO A WELL-DEFINED LOW LEVEL CIRCULATION CENTER (LLCC). THE INITIAL POSITION WAS BASED ON THE RADAR LOOP WITH HIGH CONFIDENCE. THE INITIAL INTENSITY WAS BASED ON PGTW, KNES, AND APRF DVORAK ESTIMATES OF 90 KNOTS. UPPER LEVEL ANALYSIS INDICATES THE SYSTEM IS LOCATED BENEATH THE SUBTROPICAL RIDGE AXIS IN AN AREA OF FAVORABLE EQUATORWARD OUTFLOW AND A POLEWARD OUTFLOW CHANNEL INTO A TRANSITORY MID-LATITUDE TROUGH. TC 10S IS CURRENTLY TRACKING ALONG THE NORTHWESTERN PERIPHERY OF A SUBTROPICAL STEERING RIDGE CENTERED OVER AUSTRALIA. AS AN UPPER LEVEL, MID-LATITUDE TROUGH WEAKENS THE STEERING RIDGE, THE SYSTEM IS FORECAST TO TURN POLEWARD AND RECURVE INTO THE WESTERLIES BY TAU 48. TC BIANCA IS EXPECTED TO INTENSIFY WITHIN THE NEXT 12 HOURS DUE TO THE FAVORABLE OUTFLOW. AFTER TAU 12, IT SHOULD BEGIN TO WEAKEN DUE TO LOW SEA SURFACE TEMPERATURES AND INCREASING VERTICAL WIND SHEAR AND COMPLETE EXTRA-TROPICAL TRANSITION BY TAU 48. THE PREVIOUS INTENSITY WAS RE-ANALYZED TO 75 KNOTS AND THE SYSTEM HAS RAPIDLY INTENSIFIED WITHIN THE PAST 6 HOURS, THEREFORE, THE CURRENT FORECAST INTENSITY IS HIGHER THAN THE PREVIOUS FORECAST. NUMERICAL MODEL GUIDANCE IS TIGHTLY PACKED, WITH THE EXCEPTION OF GFDN, WHICH CONTINUE TO TRACK THE SYSTEM SOUTHWESTWARD INTO THE APPROACHING UPPER LEVEL TROUGH. BASED ON THESE MODEL INCONSISTENCIES, THE CURRENT FORECAST TRACK IS SLIGHTLY LEFT AND FASTER THEN MODEL CONSENSUS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 271800Z IS 26 FEET. NEXT WARNINGS AT 280300Z, 280900Z, 281500Z AND 282100Z.// ========================================================================= WTXS33 PGTW 20110128 09:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 10S (BIANCA) WARNING NR 010// RMKS/ 1. TROPICAL CYCLONE 10S (BIANCA) WARNING NR 010 01 ACTIVE TROPICAL CYCLONE IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 280600Z --- NEAR 23.8S 108.7E MOVEMENT PAST SIX HOURS - 235 DEGREES AT 15 KTS POSITION ACCURATE TO WITHIN 025 NM POSITION BASED ON EYE FIXED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 115 KT, GUSTS 140 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 040 NM NORTHEAST QUADRANT 040 NM SOUTHEAST QUADRANT 040 NM SOUTHWEST QUADRANT 030 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 075 NM NORTHEAST QUADRANT 085 NM SOUTHEAST QUADRANT 075 NM SOUTHWEST QUADRANT 065 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 160 NM NORTHEAST QUADRANT 180 NM SOUTHEAST QUADRANT 160 NM SOUTHWEST QUADRANT 150 NM NORTHWEST QUADRANT REPEAT POSIT: 23.8S 108.7E --- FORECASTS: 12 HRS, VALID AT: 281800Z --- 26.3S 107.7E MAX SUSTAINED WINDS - 105 KT, GUSTS 130 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 040 NM NORTHEAST QUADRANT 040 NM SOUTHEAST QUADRANT 040 NM SOUTHWEST QUADRANT 030 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 065 NM NORTHEAST QUADRANT 075 NM SOUTHEAST QUADRANT 065 NM SOUTHWEST QUADRANT 055 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 150 NM NORTHEAST QUADRANT 170 NM SOUTHEAST QUADRANT 150 NM SOUTHWEST QUADRANT 140 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 155 DEG/ 15 KTS --- 24 HRS, VALID AT: 290600Z --- 29.1S 109.2E MAX SUSTAINED WINDS - 080 KT, GUSTS 100 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL RADIUS OF 064 KT WINDS - 030 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 020 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 060 NM NORTHEAST QUADRANT 060 NM SOUTHEAST QUADRANT 060 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 135 NM NORTHEAST QUADRANT 135 NM SOUTHEAST QUADRANT 135 NM SOUTHWEST QUADRANT 115 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 130 DEG/ 14 KTS --- 36 HRS, VALID AT: 291800Z --- 30.9S 111.8E MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL RADIUS OF 034 KT WINDS - 120 NM NORTHEAST QUADRANT 120 NM SOUTHEAST QUADRANT 110 NM SOUTHWEST QUADRANT 100 NM NORTHWEST QUADRANT VECTOR TO 48 HR POSIT: 115 DEG/ 21 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 300600Z --- 32.5S 116.3E MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL --- REMARKS: 280900Z POSITION NEAR 24.4S 108.4E. TROPICAL CYCLONE (TC) 10S (BIANCA), LOCATED APPROXIMATELY 310 NM WEST-SOUTHWEST OF LEARMONTH, AUSTRALIA, HAS TRACKED SOUTHWESTWARD AT 15 KNOTS OVER THE PAST SIX HOURS. ANIMATED MULTI-SPECTRAL SATELLITE IMAGERY INDICATES TC 10S HAS UNDERGONE RAPID INTENSIFICATION OVER THE PAST 24 HOURS AND HAS DEVELOPED A ROUND 9 NM EYE WITH A CONCENTRIC EYE WALL. THERE IS HIGH CONFIDENCE IN THE CURRENT POSITION BASED ON A 28/0532Z PGTW EYE FIX. THE CURRENT INTENSITY IS BASED ON DVORAK ESTIMATES RANGING FROM 102 TO 115 KNOTS FROM APRF AND PGTW. UPPER LEVEL ANALYSIS INDICATES TC BIANCA IS LOCATED UNDER THE RIDGE AXIS WITH GOOD EQUATORWARD OUTFLOW AND ENHANCED POLEWARD OUTFLOW AHEAD OF TRANSITORY MID-LATITUDE TROUGH. TC 10S IS CURRENTLY TRACKING ALONG THE WESTERN PERIPHERY OF A DEEP-LAYERED SUBTROPICAL STEERING RIDGE CENTERED OVER AUSTRALIA. WITHIN THE NEXT 12 TO 24 HOURS, TC BIANCA SHOULD EXPERIENCE GRADUAL WEAKENING AS IT BEGINS TO ENCOUNTER COOLER SEA SURFACE TEMPERATURES AND INCREASED VERTICAL WIND SHEAR. AS AN UPPER LEVEL, MID-LATITUDE TROUGH WEAKENS THE STEERING RIDGE, THE SYSTEM IS FORECAST TO TURN POLEWARD BY TAU 24, AND BE COMPLETELY ABSORBED INTO THE MID-LATITUDE WESTERLIES BEFORE LANDFALL WITH SOUTHWESTERN AUSTRALIA. NUMERICAL MODEL GUIDANCE IS IN GOOD AGREEMENT WITH THIS FORECAST, WITH THE EXCEPTION OF GFDN AND NGPS WHICH DEPICT A NORTHWESTWARD TRACK AFTER TAU 48. THIS TRACK SEEMS UNLIKELY GIVEN THE APPROACHING UPPER LEVEL TROUGH; THEREFORE THIS FORECAST IS SLIGHTLY INSIDE AND FASTER THEN MODEL CONSENSUS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 280600Z IS 30 FEET. NEXT WARNINGS AT 282100Z AND 290900Z.// ========================================================================= WTXS33 PGTW 20110128 21:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 10S (BIANCA) WARNING NR 011// RMKS/ 1. TROPICAL CYCLONE 10S (BIANCA) WARNING NR 011 01 ACTIVE TROPICAL CYCLONE IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 281800Z --- NEAR 26.6S 107.9E MOVEMENT PAST SIX HOURS - 195 DEGREES AT 14 KTS POSITION ACCURATE TO WITHIN 040 NM POSITION BASED ON EYE FIXED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS - 030 NM NORTHEAST QUADRANT 040 NM SOUTHEAST QUADRANT 040 NM SOUTHWEST QUADRANT 030 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 065 NM NORTHEAST QUADRANT 075 NM SOUTHEAST QUADRANT 075 NM SOUTHWEST QUADRANT 055 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 120 NM NORTHEAST QUADRANT 140 NM SOUTHEAST QUADRANT 140 NM SOUTHWEST QUADRANT 110 NM NORTHWEST QUADRANT REPEAT POSIT: 26.6S 107.9E --- FORECASTS: 12 HRS, VALID AT: 290600Z --- 28.9S 108.8E MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL RADIUS OF 050 KT WINDS - 065 NM NORTHEAST QUADRANT 075 NM SOUTHEAST QUADRANT 065 NM SOUTHWEST QUADRANT 055 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 150 NM NORTHEAST QUADRANT 170 NM SOUTHEAST QUADRANT 150 NM SOUTHWEST QUADRANT 140 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 135 DEG/ 12 KTS --- 24 HRS, VALID AT: 291800Z --- 30.6S 110.7E MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL VECTOR TO 36 HR POSIT: 120 DEG/ 11 KTS --- 36 HRS, VALID AT: 300600Z --- 31.6S 113.0E MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL --- REMARKS: 282100Z POSITION NEAR 27.2S 108.1E. TROPICAL CYCLONE (TC) 10S (BIANCA), LOCATED APPROXIMATELY 520 NM NORTHWEST OF PERTH, AUSTRALIA, HAS TRACKED SOUTH-SOUTHWESTWARD AT 14 KNOTS OVER THE PAST SIX HOURS. ANIMATED INFRARED (IR) SATELLITE IMAGERY DEPICTS RAPIDLY ERODING DEEP CONVECTION RESULTING FROM THE SYSTEM'S TRACK OVER COOL SST (24-25C). TC 10S, HOWEVER, HAS MAINTAINED A STRONG POLEWARD OUTFLOW CHANNEL, ASSOCIATED WITH A DEEPENING MIDLATITUDE SHORTWAVE TROUGH TO THE WEST, WHICH IS OFF- SETTING THE COOL SST AND ALLOWING THE SYSTEM TO MAINTAIN A 20 NM EYE. A 281747Z AMSU IMAGE DEPICTS A PARTIAL EYEWALL OVER THE WESTERN SEMI- CIRCLE AND TIGHTLY-CURVED BANDING. THE CURRENT INTENSITY IS ASSESSED AT 75 KNOTS AND IS BASED ON THE DVORAK CURRENT INTENSITY ESTIMATES FROM PGTW AND APRF OF 77 KNOTS. THERE IS GOOD CONFIDENCE IN THE CURRENT POSITION BASED ON THE EYE FEATURE. TC 10S IS FORECAST TO RE- CURVE AND WILL CONTINUE TO RAPIDLY WEAKEN DUE TO INCREASING VERTICAL WIND SHEAR AND DECREASING SST (< 24C). THE SYSTEM WILL BEGIN EXTRA- TROPICAL TRANSITION (ETT) WITHIN THE NEXT 12 HOURS AND WILL COMPLETE ETT BETWEEN TAU 24-36. THERE IS A GOOD POSSIBILITY THAT THE REMNANTS OF TC 10S WILL STALL NEAR TAU 36 OR TRACK NORTHWESTWARD UNDER SOUTHEASTERLY FLOW ASSOCIATED WITH A STRONG LOW-LEVEL RIDGE FORECAST TO BUILD OVER THE EASTERN INDIAN OCEAN. MODEL GUIDANCE IS INCREASINGLY SUPPORTING THIS SCENARIO. REGARDLESS, TC 10S IS FORECAST TO WEAKEN BELOW 35 KNOTS BY TAU 36. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 281800Z IS 25 FEET. NEXT WARNINGS AT 290900Z AND 292100Z.// ========================================================================= WTXS33 PGTW 20110129 09:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 10S (BIANCA) WARNING NR 012// RMKS/ 1. TROPICAL CYCLONE 10S (BIANCA) WARNING NR 012 01 ACTIVE TROPICAL CYCLONE IN SOUTH IO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 290600Z --- NEAR 29.4S 108.7E MOVEMENT PAST SIX HOURS - 155 DEGREES AT 17 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL RADIUS OF 050 KT WINDS - 055 NM NORTHEAST QUADRANT 065 NM SOUTHEAST QUADRANT 065 NM SOUTHWEST QUADRANT 045 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 100 NM NORTHEAST QUADRANT 120 NM SOUTHEAST QUADRANT 120 NM SOUTHWEST QUADRANT 090 NM NORTHWEST QUADRANT REPEAT POSIT: 29.4S 108.7E --- FORECASTS: 12 HRS, VALID AT: 291800Z --- 31.1S 111.0E MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL RADIUS OF 034 KT WINDS - 125 NM NORTHEAST QUADRANT 145 NM SOUTHEAST QUADRANT 125 NM SOUTHWEST QUADRANT 115 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 115 DEG/ 09 KTS --- 24 HRS, VALID AT: 300600Z --- 31.8S 112.9E MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL --- REMARKS: 290900Z POSITION NEAR 29.8S 109.3E. TROPICAL CYCLONE (TC) 10S (BIANCA), LOCATED APPROXIMATELY 390 NM WEST-NORTHWEST OF PERTH, AUSTRALIA, HAS TRACKED SOUTHEASTWARD AT 17 KNOTS OVER THE PAST SIX HOURS. ANIMATED WATER VAPOR IMAGERY SHOWS THE SYSTEM HAS BEGUN TO ACCELERATE AND BECOME ELONGATED AS THE MAIN CONVECTION IS DISPLACED TOWARDS THE SOUTHEAST QUADRANT. THE SAME ANIMATION SHOWS EXCESSIVE POLEWARD OUTFLOW. THE CURRENT POSITION AND INTENSITY ARE BASED ON DVORAK ESTIMATE FIXES FROM PGTW AND KNES. UPPER LEVEL ANALYSIS INDICATES TC 10S IS NOW ENTRENCHED IN THE MID-LATITUDE TROUGH APPROACHING FROM THE WEST, EXPOSING THE SYSTEM TO INCREASED VERTICAL WIND SHEAR ASSOCIATED WITH THE PREVAILING WESTERLIES. SEA SURFACE TEMPERATURES HAVE ALSO DECREASED TO BELOW 25C. TC BIANCA IS EXPECTED TO RAPIDLY DECAY, GIVEN THE HARSH ENVIRONMENTAL CONDITIONS, AND BECOME EXTRA-TROPICAL BY TAU 24. ITS REMNANTS MAY STALL AND EVEN RECURVE NORTHWESTWARD AROUND THIS TIME FRAME AS A LOW LEVEL RIDGE TO THE SOUTHWEST ASSUMES STEERING. MODEL GUIDANCE IS INCREASINGLY SUPPORTING THIS SCENARIO. REGARDLESS, TC 10S IS FORECAST TO WEAKEN TO BELOW 30 KNOTS BY TAU 24. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 290600Z IS 22 FEET. NEXT WARNINGS AT 292100Z.// ========================================================================= WTXS33 PGTW 20110129 21:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 10S (BIANCA) WARNING NR 013// RMKS/ 1. TROPICAL CYCLONE 10S (BIANCA) WARNING NR 013 01 ACTIVE TROPICAL CYCLONE IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 291800Z --- NEAR 31.1S 110.8E MOVEMENT PAST SIX HOURS - 135 DEGREES AT 13 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL RADIUS OF 034 KT WINDS - 065 NM NORTHEAST QUADRANT 080 NM SOUTHEAST QUADRANT 080 NM SOUTHWEST QUADRANT 065 NM NORTHWEST QUADRANT REPEAT POSIT: 31.1S 110.8E --- FORECASTS: 12 HRS, VALID AT: 300600Z --- 32.3S 113.3E MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL --- REMARKS: 292100Z POSITION NEAR 31.4S 111.4E. TROPICAL CYCLONE (TC) 10S (BIANCA), LOCATED APPROXIMATELY 265 NM WEST OF PERTH, AUSTRALIA, HAS TRACKED SOUTHEASTWARD AT 13 KNOTS OVER THE PAST SIX HOURS. ANIMATED INFRARED SATELLITE IMAGERY INDICATES THAT THE SYSTEM HAS CLEARLY COMMENCED EXTRA-TROPICAL TRANSITION (ETT) WITH THE DEEP CONVECTION RAPIDLY DECAYING OVER VERY COOL SST (< 22C) AND SHEARING SOUTHEAST OF THE DE-COUPLED LLCC. TC 10S IS INTERACTING WITH A WEAK BAROCLINIC ZONE ASSOCIATED WITH A DEEP SHORTWAVE TROUGH. THE CURRENT INTENSITY IS BASED ON DVORAK ESTIMATES RANGING FROM 35 TO 55 KNOTS AND A 291350Z ASCAT IMAGE SUPPORTING 40-45 KNOT WINDS OVER THE EASTERN SEMI-CIRCLE. THE SYSTEM IS EXPECTED TO CONTINUE TO WEAKEN AS IT TRACKS SOUTH- EASTWARD AND WILL COMPLETE ETT BY TAU 12. THIS IS THE FINAL WARNING ON THIS SYSTEM BY THE JOINT TYPHOON WARNING CENTER (NAVMARFCSTCEN). THE SYSTEM WILL BE CLOSELY MONITORED FOR SIGNS OF REGENERATION. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 291800Z IS 20 FEET.//
Tropical cyclone tracks developed by Michael Bath using operational warnings and advisories.
Document: tropical_cyclone_bianca_jtwc_advisories.htm
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