Tropical Cyclones
[Index] | Tropical Cyclone IZILDA : JTWC Advisories |
Season 2008-2009 Summaries (Operational Data): [AU] [SIO] [SPAC] [SH] | |
---> Tropical Cyclone IZILDA Track Map and Data |
WTXS21 PGTW 20090323 11:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE FORMATION ALERT// RMKS/ 1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN A 200 NM RADIUS OF 18.7S 40.8E WITHIN THE NEXT 12 TO 24 HOURS. AVAIL- ABLE 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 AT 230530Z INDICATES THAT A CIRCULATION CENTER IS LOCATED NEAR 18.5S 40.7E. THE SYSTEM IS QUASI-STATIONARY. 2. REMARKS: THE AREA OF CONVECTION PREVIOUSLY LOCATED NEAR 17.3S 37.9E, IS NOW LOCATED NEAR 18.5S 40.7E, APPROXIMATELY 360 NM WEST OF ANTANANARIVO. RECENT ANIMATED MULTISPECTRAL IMAGERY SHOWS A RAPIDLY CONSOLIDATING LOW LEVEL CIRCULATION CENTER (LLCC) IN THE CENTER OF THE MOZAMBIQUE CHANNEL. DEEP CONVECTIVE BANDS ARE BUILDING TOWARD THE CENTER OF THE LLCC WITH TIGHTLY CURVED BANDING IN THE LOW LEVEL. THE LLCC IS IN VERY FAVORABLE SEA SURFACE TEMPERATURES WITH HIGH LEVELS OF OCEAN HEAT CONTENT AVAILABLE, HELPING TO FUEL THE RAPID DEVELOP- MENT SEEN OVER THE PAST 6 HOURS. UPPER LEVEL ANALYSIS INDICATES THE LLCC IS UNDER THE AXIS OF THE UPPER LEVEL SUBTROPICAL RIDGE PROVIDING DUAL OUTFLOW CHANNELS AND LOW VERTICAL WIND SHEAR. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 25 TO 30 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1003 MB. THE POTENTIAL 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 231100Z.// ========================================================================= WTXS31 PGTW 20090324 09:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 24S (TWENTY-FOU) WARNING NR 001// RMKS/ 1. TROPICAL CYCLONE 24S (TWENTY-FOU) WARNING NR 001 02 ACTIVE TROPICAL CYCLONES IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 240600Z --- NEAR 21.1S 41.8E MOVEMENT PAST SIX HOURS - 160 DEGREES AT 08 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT WIND RADII VALID OVER OPEN WATER ONLY REPEAT POSIT: 21.1S 41.8E --- FORECASTS: 12 HRS, VALID AT: 241800Z --- 21.4S 41.8E MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY VECTOR TO 24 HR POSIT: 195 DEG/ 02 KTS --- 24 HRS, VALID AT: 250600Z --- 21.7S 41.7E MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 020 NM NORTHEAST QUADRANT 020 NM SOUTHEAST QUADRANT 020 NM SOUTHWEST QUADRANT 020 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 255 DEG/ 02 KTS --- 36 HRS, VALID AT: 251800Z --- 21.8S 41.3E MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 020 NM NORTHEAST QUADRANT 020 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 025 NM NORTHWEST QUADRANT VECTOR TO 48 HR POSIT: 270 DEG/ 04 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 260600Z --- 21.8S 40.5E MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 025 NM NORTHEAST QUADRANT 025 NM SOUTHEAST QUADRANT 035 NM SOUTHWEST QUADRANT 030 NM NORTHWEST QUADRANT --- REMARKS: 240900Z POSITION NEAR 21.2S 41.8E. TROPICAL CYCLONE (TC) 24S (TWENTY-FOUR), LOCATED APPROXIMATELY 320 NM WEST-SOUTHWEST OF ANTANANARIVO, MADAGASCAR HAS TRACKED SOUTH-SOUTH-EASTWARD AT 08 KNOTS OVER THE PAST SIX HOURS. RECENT ANIMATED WATER VAPOR SATELLITE IMAGERY SHOWS A BROAD AREA OF DEEP CONVECTION FLARING NEAR AN ORGANIZED LOW LEVEL CIRCULATION CENTER (LLCC). THIS LLCC LIES IN AN AREA OF LOW VERTICAL WIND SHEAR NEAR THE CENTER OF AN UPPER LEVEL MESOSCALE ANTICYCLONE. ADDITIONALLY, NORTHWESTERLY FLOW AHEAD OF AN APPROACHING UPPER LEVEL TROUGH TO THE SOUTHWEST OF THE CYCLONE HAS INTRODUCED A STRONG POLEWARD OUTFLOW MECHANISM. CURRENT INTENSITY IS BASED ON DVORAK VALUES OF 2.5 AND 2.0 FROM PGTW AND KNES, RESPECTIVELY. A SHIP JUST TO THE WEST OF THE LLCC ALSO REPORTED 30-KNOT SOUTHERLY WINDS AT 232200Z. SEA SURFACE TEMPERA- TURES AND OCEAN HEAT CONTENT ARE HIGH IN THE MOZAMBIQUE CHANNEL AND, ALONG WITH FAVORABLE UPPER LEVEL SUPPORT, WILL ENABLE FURTHER DEVELOPMENT OF THIS SYSTEM. TC 24S IS CURRENTLY IN A WEAK STEERING ENVIRONMENT AND IS EXPECTED TO REMAIN QUASI-STATIONARY OVER THE NEXT 12-24 HOURS BEFORE IT BEGINS TO SLOWLY DRIFT TO THE WEST. THIS WARNING SUPERSEDES AND CANCELS REF A, NAVMARFCSTCEN 231051Z MAR 09 TROPICAL CYCLONE FORMATION ALERT (WTXS21 PGTW 231100 ) MAXIMUM SIGNIFICANT WAVE HEIGHT AT 240600Z IS 12 FEET. NEXT WARNINGS AT 242100Z AND 250900Z.// ========================================================================= WTXS31 PGTW 20090324 21:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 24S (IZILDA) WARNING NR 002// RMKS/ 1. TROPICAL CYCLONE 24S (IZILDA) WARNING NR 002 02 ACTIVE TROPICAL CYCLONES IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 241800Z --- NEAR 22.3S 41.8E MOVEMENT PAST SIX HOURS - 180 DEGREES AT 07 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY REPEAT POSIT: 22.3S 41.8E --- FORECASTS: 12 HRS, VALID AT: 250600Z --- 23.0S 41.6E MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY VECTOR TO 24 HR POSIT: 230 DEG/ 02 KTS --- 24 HRS, VALID AT: 251800Z --- 23.3S 41.2E MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT 070 NM SOUTHEAST QUADRANT 065 NM SOUTHWEST QUADRANT 055 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 280 DEG/ 02 KTS --- 36 HRS, VALID AT: 260600Z --- 23.2S 40.7E MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY 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: 290 DEG/ 03 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 261800Z --- 23.0S 40.1E MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT 070 NM SOUTHEAST QUADRANT 070 NM SOUTHWEST QUADRANT 060 NM NORTHWEST QUADRANT --- REMARKS: 242100Z POSITION NEAR 22.5S 41.7E. TROPICAL CYCLONE (TC) 24S (IZILDA), LOCATED APPROXIMATELY 355 NM SOUTHWEST OF ANTANANARIVO, MADAGASCAR, HAS TRACKED SOUTHWARD AT 07 KNOTS OVER THE PAST SIX HOURS. THE CURRENT POSITION ESTIMATE IS BASED ON SATELLITE FIXES FROM PGTW AND FMEE AND A 241508Z WINDSAT PASS. THE CURRENT INTENSITY ESTIMATE IS CONSISTENT WITH DVORAK T- NUMBERS OF 2.5 REPORTED BY PGTW AND FMEE. TC 24S IS TRACKING POLEWARD ALONG THE WESTERN PERIPHERY OF A SUBTROPICAL STEERING RIDGE TO THE EAST. OVER THE NEXT 12 TO 24 HOURS, A SECOND RIDGE WILL BUILD TO THE SOUTH OF THE CYCLONE AND PROVIDE A COMPETING STEERING INFLUENCE, REDUCING FORWARD TRACK SPEED AND TURNING TC 24S SLOWLY WESTWARD AROUND TAU 24. MODERATE VERTICAL WIND SHEAR WILL OFFSET THE POSITIVE INTENSITY INFLUENCES OF STRONG POLEWARD OUTFLOW AND FAVORABLE SEA SURFACE TEMPERATURES DURING THE FORECAST PERIOD, PREVENTING SIGNIFICANT INTENSIFICATION. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 241800Z IS 12 FEET. NEXT WARNINGS AT 250900Z AND 252100Z.// ========================================================================= WTXS31 PGTW 20090325 09:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 24S (IZILDA) WARNING NR 003// RMKS/ 1. TROPICAL CYCLONE 24S (IZILDA) WARNING NR 003 01 ACTIVE TROPICAL CYCLONE IN SOUTH IO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 250600Z --- NEAR 23.1S 42.2E MOVEMENT PAST SIX HOURS - 165 DEGREES AT 03 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY REPEAT POSIT: 23.1S 42.2E --- FORECASTS: 12 HRS, VALID AT: 251800Z --- 23.3S 42.2E MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY VECTOR TO 24 HR POSIT: 225 DEG/ 01 KTS --- 24 HRS, VALID AT: 260600Z --- 23.4S 42.1E MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY VECTOR TO 36 HR POSIT: 300 DEG/ 01 KTS --- 36 HRS, VALID AT: 261800Z --- 23.3S 41.9E MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER VECTOR TO 48 HR POSIT: 300 DEG/ 02 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 270600Z --- 23.1S 41.5E MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER --- REMARKS: 250900Z POSITION NEAR 23.1S 42.2E. TROPICAL CYCLONE (TC) 24S (IZILDA), LOCATED APPROXIMATELY 365 NM SOUTHWEST OF ANTANANARIVO, MADAGASCAR, HAS SLOWED DOWN AND TRACKED SOUTH-SOUTHEASTWARD AT 03 KNOTS OVER THE PAST SIX HOURS. THE CURRENT INTENSITY ESTIMATE IS CONSISTENT WITH DVORAK T-NUMBERS OF 2.5 REPORTED BY PGTW AND FMEE. THE CURRENT POSITION IS BASED ON SATELLITE FIXES FROM THE SAME AGENCIES AND FROM A 250254Z SSMIS MICROWAVE PASS OVER THE SYSTEM. TC 24S IS TRACKING POLEWARD ALONG THE WESTERN PERIPHERY OF A SUBTROPICAL STEERING RIDGE TO THE EAST. OVER THE NEXT 12 TO 24 HOURS, A SECOND RIDGE WILL BUILD TO THE SOUTH OF THE CYCLONE AND PROVIDE A COMPETING STEERING INFLUENCE, TURNING THE CYCLONE SLOWLY WESTWARD. AN ALTERNATE SCENARIO IS FOR THE SYSTEM TO CONTINUE TO STEER SOUTHWARD BY THE RIDGE TO THE EAST. IN EITHER CASE, MODERATE VERTICAL WIND SHEAR WILL OFFSET THE STRONG POLEWARD OUTFLOW, EVIDENT ON WATER VAPOR SATELLITE ANIMATION, CAUSING THE SYSTEM TO DISSIPATE BY TAU 48. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 250600Z IS 12 FEET. NEXT WARNINGS AT 252100Z AND 260900Z.// ========================================================================= WTXS31 PGTW 20090325 21:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 24S (IZILDA) WARNING NR 004// RMKS/ 1. TROPICAL CYCLONE 24S (IZILDA) WARNING NR 004 01 ACTIVE TROPICAL CYCLONE IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 251800Z --- NEAR 23.8S 42.5E MOVEMENT PAST SIX HOURS - 140 DEGREES AT 03 KTS POSITION ACCURATE TO WITHIN 030 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 - 010 NM NORTHEAST QUADRANT 010 NM SOUTHEAST QUADRANT 010 NM SOUTHWEST QUADRANT 010 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 045 NM NORTHEAST QUADRANT 040 NM SOUTHEAST QUADRANT 040 NM SOUTHWEST QUADRANT 045 NM NORTHWEST QUADRANT REPEAT POSIT: 23.8S 42.5E --- FORECASTS: 12 HRS, VALID AT: 260600Z --- 23.6S 42.6E MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 050 KT WINDS - 020 NM NORTHEAST QUADRANT 025 NM SOUTHEAST QUADRANT 020 NM SOUTHWEST QUADRANT 020 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 055 NM NORTHEAST QUADRANT 060 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 305 DEG/ 03 KTS --- 24 HRS, VALID AT: 261800Z --- 23.2S 42.0E MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 050 KT WINDS - 025 NM NORTHEAST QUADRANT 020 NM SOUTHEAST QUADRANT 020 NM SOUTHWEST QUADRANT 020 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT 055 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 300 DEG/ 05 KTS --- 36 HRS, VALID AT: 270600Z --- 22.7S 41.1E MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT 045 NM SOUTHEAST QUADRANT 045 NM SOUTHWEST QUADRANT 045 NM NORTHWEST QUADRANT VECTOR TO 48 HR POSIT: 295 DEG/ 06 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 271800Z --- 22.2S 39.9E MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 035 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 035 NM NORTHWEST QUADRANT --- REMARKS: 252100Z POSITION NEAR 23.8S 42.5E. TROPICAL CYCLONE (TC) 24S (IZILDA), LOCATED APPROXIMATELY 385 NM SOUTHWEST OF ANTANANARIVO, MADAGASCAR, HAS TRACKED SOUTHEASTWARD AT 03 KNOTS OVER THE PAST SIX HOURS. TC 24S HAS INTENSIFIED RAPIDLY OVER THE LAST 12 HOURS WITH THE CURRENT INTENSITY ESTIMATE BASED ON FIXES FROM PGTW AND FMEE. ANIMATED INFRARED IMAGERY SHOWS WELL FORMED CONVECTIVE BANDS WRAPPING INTO A TIGHTLY FORMED BANDING EYE FEATURE WITH A STRONG POLEWARD OUTFLOW CHANNEL. A 251727Z SSMI-S IMAGE SHOWS A TIGHT SPIRAL OF BROKEN DEEP CONVECTION AROUND THE LOW LEVEL CIRCULATION CENTER WITH A LARGE REGION OF DRY AIR TO THE SOUTHWEST OF THE SYSTEM. TC 24S IS IN A WEAK STEERING ENVIRONMENT AND OVER THE NEXT 12 HOURS, THE LOW- TO MID-LEVEL SUBTROPICAL RIDGE TO THE SOUTHWEST WILL BUILD AND PROVIDE THE STEERING INFLUENCE, TURNING THE CYCLONE SLOWLY WESTWARD AND BACK INTO THE MOZAMBIQUE CHANNEL. DRY AIR ENTRAINMENT AND INCREASED VERTICAL WIND SHEAR WILL OFFSET THE STRONG POLEWARD OUTFLOW INITIATING A WEAKENING TREND BEYOND TAU 12. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 251800Z IS 13 FEET. NEXT WARNINGS AT 260900Z AND 262100Z. ========================================================================= WTXS31 PGTW 20090326 09:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 24S (IZILDA) WARNING NR 005// RMKS/ 1. TROPICAL CYCLONE 24S (IZILDA) WARNING NR 005 01 ACTIVE TROPICAL CYCLONE IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 260600Z --- NEAR 23.7S 43.3E MOVEMENT PAST SIX HOURS - 090 DEGREES AT 05 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 RADIUS OF 050 KT WINDS - 050 NM NORTHEAST QUADRANT 050 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT 045 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 070 NM NORTHEAST QUADRANT 085 NM SOUTHEAST QUADRANT 090 NM SOUTHWEST QUADRANT 085 NM NORTHWEST QUADRANT REPEAT POSIT: 23.7S 43.3E --- FORECASTS: 12 HRS, VALID AT: 261800Z --- 23.8S 43.4E MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 050 KT WINDS - 020 NM NORTHEAST QUADRANT 025 NM SOUTHEAST QUADRANT 020 NM SOUTHWEST QUADRANT 020 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 055 NM NORTHEAST QUADRANT 060 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 205 DEG/ 01 KTS --- 24 HRS, VALID AT: 270600Z --- 24.0S 43.3E MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 050 KT WINDS - 025 NM NORTHEAST QUADRANT 020 NM SOUTHEAST QUADRANT 020 NM SOUTHWEST QUADRANT 020 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT 055 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 280 DEG/ 03 KTS --- 36 HRS, VALID AT: 271800Z --- 23.9S 42.6E MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT 045 NM SOUTHEAST QUADRANT 045 NM SOUTHWEST QUADRANT 045 NM NORTHWEST QUADRANT VECTOR TO 48 HR POSIT: 285 DEG/ 04 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 280600Z --- 23.7S 41.8E MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 035 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 035 NM NORTHWEST QUADRANT --- REMARKS: 260900Z POSITION NEAR 23.7S 43.3E. TROPICAL CYCLONE TC) 24S (IZILDA) LOCATED APPROXIMATELY 350 NM SOUTHWEST OF ANTANANARIVO, MADAGASCAR HAS TRACKED EASTWARD AT 05 KNOTS OVER THE PAST SIX HOURS. CURRENT INTENSITY IS BASED ON SATELLITE INTENSITY ESTIMATES RANGING FROM 45 TO 65 KNOTS FROM PGTW AND FMEE. TC 24S IS FORECAST TO WEAKEN THROUGHOUT THE FORECAST PERIOD AS IT INTERACTS WITH LAND ON ITS EASTERN PERIPHERY AND INCREASING VERTICAL WINDSHEAR FROM AN APPROACHING UPPER LEVEL TROUGH TO THE SOUTHWEST. THE VERTICAL WINDSHEAR WILL CAUSE DECOUPLING OF THE DEEP CONVECTION FROM THE LOW LEVEL CIRCULATION CENTER (LLCC). AS VERTICAL WINDSHEAR INCREASES, THE LLCC WILL BEGIN TO STEER ON AN EXTENSION OF SUBTROPICAL RIDGING CENTERED TO THE WEST OVER SOUTH AFRICA AND EXTENDING INTO THE SOUTHERN MOZAMBIQUE CHANNEL. THIS WILL CAUSE THE WEAKENING LLCC TO TRACK TO THE WEST-NORTHWEST AND BACK INTO THE MOZAMBIQUE CHANNEL. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 260600Z IS 14 FEET. NEXT WARNINGS AT 262100Z AND 270900Z. ========================================================================= WTXS31 PGTW 20090326 15:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 24S (IZILDA) WARNING NR 006// RMKS/ 1. TROPICAL CYCLONE 24S (IZILDA) WARNING NR 006 01 ACTIVE TROPICAL CYCLONE IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 261200Z --- NEAR 24.0S 42.8E MOVEMENT PAST SIX HOURS - 205 DEGREES AT 02 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 050 KT WINDS - 040 NM NORTHEAST QUADRANT 050 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT 045 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 085 NM NORTHEAST QUADRANT 080 NM SOUTHEAST QUADRANT 095 NM SOUTHWEST QUADRANT 080 NM NORTHWEST QUADRANT REPEAT POSIT: 24.0S 42.8E --- FORECASTS: 12 HRS, VALID AT: 270000Z --- 24.1S 42.5E MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 055 NM NORTHEAST QUADRANT 060 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 290 DEG/ 03 KTS --- 24 HRS, VALID AT: 271200Z --- 23.9S 41.9E MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT 055 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 285 DEG/ 03 KTS --- 36 HRS, VALID AT: 280000Z --- 23.7S 41.2E MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT 045 NM SOUTHEAST QUADRANT 045 NM SOUTHWEST QUADRANT 045 NM NORTHWEST QUADRANT VECTOR TO 48 HR POSIT: 275 DEG/ 04 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 281200Z --- 23.6S 40.3E MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY --- REMARKS: 261500Z POSITION NEAR 24.0S 42.7E. TROPICAL CYCLONE (TC) 24S (IZILDA) LOCATED APPROXIMATELY 380 NM SOUTHWEST OF ANTANANARIVO, MADAGASCAR HAS TRACKED SOUTH- SOUTHWESTWARD AT 02 KNOTS OVER THE PAST SIX HOURS. CURRENT INTENSITY IS BASED ON SATELLITE INTENSITY ESTIMATES RANGING FROM 45 TO 65 KNOTS FROM PGTW AND FMEE. TC 24S IS FORECAST TO CONTINUE WEAKENING THROUGHOUT THE FORECAST PERIOD AS IT INTERACTS UNDER THE INFLUENCE OF INCREASING VERTICAL WINDSHEAR FROM AN APPROACHING UPPER LEVEL TROUGH TO THE SOUTHWEST. THE VERTICAL WINDSHEAR HAS CAUSED DECOUPLING OF THE DEEP CONVECTION FROM THE LOW LEVEL CIRCULATION CENTER (LLCC). AS VERTICAL WINDSHEAR HAS INCREASED, THE LLCC HAS BEGUN TO STEER ON AN EXTENSION OF THE SUBTROPICAL RIDGE CENTERED TO THE WEST OVER SOUTH AFRICA AND EXTENDING INTO THE SOUTHERN MOZAMBIQUE CHANNEL. THE LLCC HAS TURNED BACK TO THE WEST AS THE SYSTEM WEAKENS. THE WARNING PHILOSOPHY REMAINS THE SAME, BUT DUE TO A GREATER THAN ANTICIPATED IMPACT OF VERTICAL WINDSHEAR AND WEAKENING, THE LLCC TURNED EARLIER THAN PREVIOUSLY FORECASTED. THE LLCC IS NOW FULLY EXPOSED, AND IS SHEARED MORE THAN 65 NM FROM THE DEEP CONVECTION. THE MAXIMUM SIGNIFICANT WAVE HEIGHT AT 261200Z IS 14 FEET. NEXT WARNINGS AT 270300Z AND 271500Z. ========================================================================= WTXS31 PGTW 20090326 21:00z MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 24S (IZILDA) WARNING NR 007// RMKS/ 1. TROPICAL CYCLONE 24S (IZILDA) WARNING NR 007 01 ACTIVE TROPICAL CYCLONE IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 261800Z --- NEAR 23.8S 42.1E MOVEMENT PAST SIX HOURS - 300 DEGREES AT 02 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER REPEAT POSIT: 23.8S 42.1E --- FORECASTS: 12 HRS, VALID AT: 270600Z --- 23.6S 41.6E MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER VECTOR TO 24 HR POSIT: 295 DEG/ 05 KTS --- 24 HRS, VALID AT: 271800Z --- 23.2S 40.7E MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER --- REMARKS: 262100Z POSITION NEAR 23.8S 42.0E. TROPICAL CYCLONE (TC) 24S (IZILDA) LOCATED APPROXIMATELY 400 NM SOUTHWEST OF ANTANANARIVO, MADAGASCAR HAS REMAINED QUASISTATIONARY OVER THE PAST SIX HOURS. CURRENT INTENSITY IS BASED ON SATELLITE INTENSITY ESTIMATES FROM PGTW AND FMEE. TC 24S IS FORECAST TO CONTINUE WEAKENING THROUGHOUT THE FORECAST PERIOD AS AN APPROACHING UPPER LEVEL TROUGH TO THE SOUTHWEST INCREASES VERTICAL WINDSHEAR. A 261722Z TRMM IMAGE SHOWS A LOW LEVEL CIRCULATION CENTER (LLCC) COMPLETELY DECOUPLED FROM THE UPPER LEVELS WITH DEEP CONVECTION LOCATED TO THE SOUTHEAST. THE LLCC CONTINUES TO STEER ALONG THE NORTHEAST PERIPHARY OF A SUBTROPICAL RIDGE CENTERED TO THE WEST. 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 261800Z IS 14 FEET.
Tropical cyclone tracks developed by Michael Bath using operational warnings and advisories.
Document: tropical_cyclone_izilda_jtwc_advisories.htm
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