Tropical
Cyclones
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Tropical Cyclone CILLA [Australian Region][South Indian Ocean][South Pacific Ocean] |
WTPS22 PGTW 20030126 13:00z COR MSGID/GENADMIN/NAVPACMETOCCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE FORMATION ALERT 261251Z JAN 03// IMMEDIATE DELIVERY REQ TO AMEMBASSY SUVA AMEMBASSY SUVA REQ PASS TO USAID OFDA ADVISOR 1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN 125 NM EITHER SIDE OF A LINE FROM 15.5S1 177.6E1 TO 17.5S3 178.9W5 WITHIN THE NEXT 12 TO 24 HOURS. AVAILABLE DATA DOES NOT JUSTIFY ISSUANCE OF A NUMBERED TROPICAL CYCLONE WARNINGS AT THIS TIME. WINDS IN THE AREA ARE ESTIMATED TO BE 25 TO 30 KNOTS. METSAT IMAGERY AT 261130Z3 INDICATES THAT A CIRCULATION CENTER IS LOCATED NEAR 15.9S5 178.2E8. THE SYSTEM IS MOVING SOUTHEASTWARD AT 07 KNOTS. 2. REMARKS: THE AREA OF CONVECTION PREVIOUSLY LOCATED NEAR 14.8S3 177.5E0 IS NOW LOCATED NEAR 15.9S5 178.2E8, APPROXIMATELY 200 NM NORTH-NORTHWEST OF SUVA, FIJI. ANIMATED ENHANCED INFRARED SATELLITE IMAGERY REVEALS CYCLING DEEP CONVECTION OVER A PARTIALLY EXPOSED LOW LEVEL CIRCULATION CENTER (LLCC), HOWEVER THE DEEP CONVECTION CONTINUES TO INCREASE IN ORGANIZATION. 200 MB ANALYSIS INDICATES FAVORABLE OUTFLOW ALOFT AND WEAK VERTICAL WIND SHEAR OVER THE REGION. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 25 TO 30 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE 1002 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS UPGRADED TO GOOD. 3. THIS ALERT WILL BE REISSUED, UPGRADED TO WARNING OR CANCELLED BY 271300Z3. 4. JUSTIFICATION FOR CORRECTION: CORRECTED LOCATION IN PARA.2.// ========================================================================= WTPS32 PGTW 20030127 09:00z MSGID/GENADMIN/NAVPACMETOCCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE WARNING// REF/A/NAVPACMETOCCEN PEARL HARBOR/270051Z JAN 03// AMPN/TROPICAL CYCLONE FORMATION ALERT// RMKS/ IMMEDIATE DELIVERY REQ TO AMEMBASSY SUVA AMEMBASSY SUVA REQ PASS TO USAID OFDA ADVISOR 1. TROPICAL CYCLONE 13P (CILLA) WARNING NR 001 02 ACTIVE TROPICAL CYCLONES IN SOUTHPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 270600Z5 --- NEAR 19.0S0 176.6W0 MOVEMENT PAST SIX HOURS - 125 DEGREES AT 16 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 BECOMING EXTRATROPICAL REPEAT POSIT: 19.0S0 176.6W0 --- FORECASTS: 12 HRS, VALID AT: 271800Z8 --- 20.5S7 174.6W8 MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT BECOMING EXTRATROPICAL VECTOR TO 24 HR POSIT: 100 DEG/ 09 KTS --- 24 HRS, VALID AT: 280600Z6 --- 20.8S0 172.7W7 MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT BECOMING EXTRATROPICAL VECTOR TO 36 HR POSIT: 095 DEG/ 07 KTS --- 36 HRS, VALID AT: 281800Z9 --- 20.9S1 171.1W0 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT EXTRATROPICAL --- REMARKS: 270900Z8 POSITION NEAR 19.4S4 176.1W5. TROPICAL CYCLONE (TC) 13P (CILLA), LOCATED APPROXIMATELY 290 NM EAST OF SUVA, FIJI, HAS TRACKED SOUTHEAST AT 16 KNOTS DURING THE PAST SIX HOURS. THE WARNING POSITION IS BASED ON 270530Z7 MULTISPECTRAL SATELLITE IMAGERY. THE WARNING INTENSITY IS BASED ON SATELLITE CURRENT INTENSITY ESTIMATES OF 30 AND 35 KNOTS. ANIMATED WATER VAPOR, ENHANCED INFRARED, VISIBLE AND RECENT MICROWAVE SATELLITE IMAGERY REVEAL WEAKENING CONVECTION IN THE NORTHWEST QUADRANT AND DRY AIR ENTRAINMENT FROM THE SOUTH, INDICATING EXTRATROPICAL TRANSITION HAS BEGUN. HOWEVER, THESE INDICATIONS HAVE REMAINED STEADY OVER THE PAST 12 HOURS, INDICATING A SLOWER TRANSITION TO AN EXTRATROPICAL SYSTEM AS THE MID-LATITUDE SYSTEM SOUTHEAST OF THE SYSTEM CONTINUES TO TRACK EASTWARD AND THE MID-LEVEL RIDGE TO THE SOUTHWEST CONTINUES TO BUILD. OUTFLOW REMAINS FAVORABLE IN THE POLEWARD DIRECTION AT THIS TIME. THE SYSTEM IS FORECAST TO TRACK SOUTHEAST FOR THE NEXT 12 HOURS AND THEN BEGIN A MORE EASTWARD TRACK FOR THE REMAINDER OF THE FORECAST PERIOD UNDER THE INFLUENCE OF THE LOW TO MID LEVEL RIDGE NORTH OF THE SYSTEM, AS EXTRATROPICAL TRANSITION SLOWLY CONTINUES. THE AVAILABLE DYNAMIC AIDS CONSISTING OF NGPS, NCEP AVIATION (AVN), AND UKMET GLOBAL (EGRR) ARE IN REASONABLE AGREEMENT WITH THIS SCENARIO. OUR FORECAST IS BASED ON PERSISTENCE AND A CONSENSUS OF THE AVAILABLE DYNAMIC AIDS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 270600Z5 IS 11 FEET. THIS WARNING SUPERSEDES AND CANCELS REF A, NAVPACMETOCCEN 270051Z JAN 03 TROPICAL CYCLONE FORMATION ALERT (WTPS22 PGTW 270100). NEXT WARNINGS AT 272100Z2 AND 280900Z9. REFER TO TROPICAL CYCLONE 12P (BENI) WARNINGS (WTPS31 PGTW) FOR TWELVE-HOURLY UPDATES.// ========================================================================= WTPS32 PGTW 20030127 21:00z AMD AMEMBASSY SUVA REQ PASS TO USAID OFDA ADVISOR 1. TROPICAL CYCLONE 13P (CILLA) WARNING NR 002A AMENDED 02 ACTIVE TROPICAL CYCLONES IN SOUTHPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 271800Z8 --- NEAR 20.0S2 173.1W2 MOVEMENT PAST SIX HOURS - 100 DEGREES AT 21 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 BECOMING EXTRATROPICAL REPEAT POSIT: 20.0S2 173.1W2 --- FORECASTS: 12 HRS, VALID AT: 280600Z6 --- 20.4S6 168.7W2 MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT EXTRATROPICAL --- REMARKS: 272100Z2 POSITION NEAR 20.1S3 172.0W0. TROPICAL CYCLONE (TC) 13P (CILLA), IS NOW RELOCATED TO 20.0S2 174.6E8 BASED ON 272030Z4 MULTISPECTRAL SATELLITE IMAGERY. TC 13P IS NOW LOCATED APPROXIMATELY 370 NM SOUTH-SOUTHWEST OF PAGO PAGO, WESTERN SAMOA, TRACKING EAST-SOUTHEAST AT 21 KNOTS DURING THE PAST SIX HOURS. THE WARNING POSITION IS BASED ON THE AFOREMENTIONED MULTISPECTRAL SATELLITE IMAGERY AND A 271727Z6 SSM/I PASS. THE WARNING INTENSITY IS BASED ON SATELLITE CURRENT INTENSITY ESTIMATES OF 30 AND 35 KNOTS. THE SSM/I PASS INDICATED THAT THE SYSTEM HAS BEGUN TO DECOUPLE FROM THE LOW LEVEL CIRCULATION CENTER (LLCC). UPPER AIR ANALYSIS AND ANIMATED WATER VAPOR IMAGERY INDICATE THE SYSTEM IS RAPIDLY TRANSITIONING TO AN EXTRATROPICAL SYSTEM. TC 13P IS EXPECTED TO WEAKEN UNDER INCREASING VERTICAL SHEAR AS IT GOES EXTRATROPICAL. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 271800Z8 IS 11 FEET. THIS IS THE FINAL WARNING ON THIS SYSTEM BY THE JOINT TYPHOON WARNING CENTER (NAVPACMETOCCEN). THE SYSTEM WILL BE CLOSELY MONITORED FOR SIGNS OF REGENERATION. REFER TO TROPICAL CYCLONE 12P (BENI) WARNINGS (WTPS31 PGTW) FOR TWELVE-HOURLY UPDATES.//
Document: cilla.html
Updated: 1st February, 2003 |
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