Tropical Cyclones
[Index] | Tropical Cyclone VANCE : JTWC Advisories |
Season 1998-1999 Summaries (Operational Data): [AU] [SIO] [SPAC] [SH] | |
---> Tropical Cyclone VANCE Track Map and Data |
WTXS21 PGTW 990317 12:30z RMKS/ 1. IMMEDIATE DELIVERY REQ TO AMEMBASSY PORT MORESBY 2. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN 200 NM EITHER SIDE OF A LINE FROM 12.7S0 130.9E3 TO 13.7S1 121.6E0 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 20 TO 25 KNOTS. METSAT IMAGERY AT 170830Z9 INDICATES THAT A CIRCULATION CENTER IS LOCATED NEAR 13.2S6 129.4E6. THE SYSTEM IS MOVING WEST- SOUTHWESTWARD AT 16 KNOTS. 3. REMARKS: CURRENT INFRARED SATELLITE IMAGERY INDICATES A MASS OF CONVECTION MOVING OFF THE COAST OF NORTHERN AUSTRALIA INTO THE TIMOR SEA. SYNOPTIC SURFACE DATA INDICATES A LOW LEVEL CIRCULATION CENTER IS EVIDENT IN THE CONVECTION. THE AREA IS IN AN AREA OF WEAK VERTICAL WIND SHEAR, AND IS BELOW AN UPPERLEVEL RIDGE CENTERED OVER TC 28S (ELAINE). THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE IN THE NEXT 24 HOURS IS GOOD. 4. THIS ALERT VALID UNTIL 181230Z5.// ========================================================================= WARNING 001 NOT AVAILABLE ========================================================================= WTXS34 PGTW 990318 15:00Z SUBJ: TROPICAL CYCLONE WARNING 1. TROPICAL CYCLONE 30S (VANCE) WARNING NR 002 04 ACTIVE TROPICAL CYCLONES IN SOUTHERN HEMISPHERE MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 181200Z2 --- NEAR 12.3S6 124.3E0 MOVEMENT PAST SIX HOURS - 280 DEGREES AT 12 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 REPEAT POSIT: 12.3S6 124.3E0 --- FORECASTS: 12 HRS, VALID AT: 190000Z0 --- 12.7S0 122.0E5 MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT RADIUS OF 035 KT WINDS - 090 NM SOUTH SEMICIRCLE 070 NM ELSEWHERE VECTOR TO 24 HR POSIT: 230 DEG/ 11 KTS --- 24 HRS, VALID AT: 191200Z3 --- 14.2S7 120.3E6 MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT RADIUS OF 050 KT WINDS - 035 NM SOUTH SEMICIRCLE 030 NM ELSEWHERE RADIUS OF 035 KT WINDS - 105 NM SOUTH SEMICIRCLE 085 NM ELSEWHERE VECTOR TO 36 HR POSIT: 205 DEG/ 12 KTS --- 36 HRS, VALID AT: 200000Z2 --- 16.4S1 119.3E4 MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT RADIUS OF 050 KT WINDS - 055 NM SOUTHEAST SEMICIRCLE 045 NM ELSEWHERE RADIUS OF 035 KT WINDS - 135 NM SOUTHEAST SEMICIRCLE 115 NM ELSEWHERE VECTOR TO 48 HR POSIT: 205 DEG/ 11 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 201200Z5 --- 18.3S2 118.3E3 MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT RADIUS OF 050 KT WINDS - 060 NM SOUTHEAST SEMICIRCLE 055 NM ELSEWHERE RADIUS OF 035 KT WINDS - 145 NM SOUTHEAST SEMICIRCLE OVER WATER 120 NM ELSEWHERE --- REMARKS: 181500Z5 POSITION NEAR 12.4S7 123.7E3. TROPICAL CYCLONE (TC) 30S HAS TRACKED WESTWARD, SOUTH OF JABIRY IN THE TIMOR SEA AT 12 KNOTS OVER THE PAST 06 HOURS. THE WARNING POSITION IS BASED UPON 181130Z4 ANIMATED INFRARED SATELLITE IMAGERY. THE WARNING INTENSITY IS BASED UPON SATELLITE CURRENT INTENSITY ESTIMATES OF 35 KNOTS. ANIMATED INFRARED SATELLITE IMAGERY INDICATES TC 30S HAS MAINTAINED STRONG CIRCULATION, BUT LOST ITS CENTRALIZED CONVECTION OVER THE PAST 12 HOURS. CURRENTLY IT IS DEVELOPING BANDS OF CONVECTION ABOUT THE LOW LEVEL CIRCULATION CENTER. UW-CIMSS SHEAR CHARTS SHOW TC 30S IS IN AN AREA OF WEAK VERTICAL WIND SHEAR. TROPICAL CYCLONE 30S SHOULD TRACK WESTWARD AND THEN SOUTHWESTWARD UNDER THE STEERING INFLUENCE OF THE SUBTROPICAL RIDGE LOCATED TO ITS SOUTH. TROPICAL CYCLONE 30S SHOULD CONTINUE TO INTENSIFY DUE TO THE FAVORABLE UPPER LEVEL ENVIRONMENT. THE WIND RADII ARE BASED UPON A COMBINATION OF CLIMATOLOGY FOR AN AVERAGED SIZED SYSTEM AND A 180145Z9 SCATTEROMETRY PASS DIRECTLY OVER THE CENTER OF THE SYSTEM. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 181200Z2 IS 14 FEET. NEXT WARNINGS AT 190300Z3 (DTG 190157Z3) AND 191500Z6 (DTG 91357Z6). REFER TO TROPICAL CYCLONE 27P (HALI) WARNINGS (WTPS31 PGTW) FOR TWELVE- HOURLY UPDATES. REFER TO TROPICAL CYCLONE 28S (ELAINE) WARNINGS (WTXS32 PGTW) FOR TWELVE-HOURLY UPDATES. REFER TO TROPICAL CYCLONE 29S (NONAME) WARNINGS (WTXS33 PGTW) FOR TWELVE-HOURLY UPDATES.// ========================================================================= WTXS34 PGTW 990319 03:00z SUBJ: TROPICAL CYCLONE WARNING 1. TROPICAL CYCLONE 30S (VANCE) WARNING NR 003 03 ACTIVE TROPICAL CYCLONES IN SOUTHERN HEMISPHERE MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 190000Z0 --- NEAR 13.6S0 121.7E1 MOVEMENT PAST SIX HOURS - 240 DEGREES AT 14 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 RADIUS OF 050 KT WINDS - 035 NM SOUTHEAST SEMICIRCLE 030 NM ELSEWHERE RADIUS OF 035 KT WINDS - 090 NM SOUTHEAST SEMICIRCLE 070 NM ELSEWHERE REPEAT POSIT: NEAR 13.6S0 121.7E1 --- FORECASTS: 12 HRS, VALID AT: 191200Z3 --- 15.0S6 119.5E6 MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT RADIUS OF 050 KT WINDS - 035 NM SOUTHEAST SEMICIRCLE 030 NM ELSEWHERE RADIUS OF 035 KT WINDS - 090 NM SOUTHEAST SEMICIRCLE 070 NM ELSEWHERE VECTOR TO 24 HR POSIT: 215 DEG/ 12 KTS --- 24 HRS, VALID AT: 200000Z2 --- 17.0S8 118.0E0 MAX SUSTAINED WINDS - 090 KT, GUSTS 110 KT RADIUS OF 050 KT WINDS - 035 NM SOUTHEAST SEMICIRCLE 030 NM ELSEWHERE RADIUS OF 035 KT WINDS - 105 NM SOUTHEAST SEMICIRCLE 085 NM ELSEWHERE VECTOR TO 36 HR POSIT: 205 DEG/ 11 KTS --- 36 HRS, VALID AT: 201200Z5 --- 19.0S0 116.9E7 MAX SUSTAINED WINDS - 095 KT, GUSTS 115 KT RADIUS OF 050 KT WINDS - 055 NM SOUTHEAST SEMICIRCLE 045 NM ELSEWHERE RADIUS OF 035 KT WINDS - 135 NM SOUTHEAST SEMICIRCLE OVER WATER 115 NM ELSEWHERE OVER WATER VECTOR TO 48 HR POSIT: 195 DEG/ 10 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 210000Z3 --- 20.9S1 116.4E2 MAX SUSTAINED WINDS - 100 KT, GUSTS 125 KT RADIUS OF 050 KT WINDS - 060 NM SOUTHEAST SEMICIRCLE OVER WATER 055 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 145 NM SOUTHEAST SEMICIRCLE OVER WATER 120 NM ELSEWHERE OVER WATER --- REMARKS: 190300Z3 POSITION NEAR 13.9S3 121.2E6. TROPICAL CYCLONE (TC) 30S (VANCE) HAS TRACKED WEST-SOUTHWESTWARD IN THE TIMOR SEA AT 14 KNOTS OVER THE PAST 06 HOURS. THE WARNING POSITION IS BASED UPON 182330Z7 ANIMATED VISIBLE SATELLITE IMAGERY. THE WARNING INTENSITY IS BASED UPON SATELLITE CURRENT INTENSITY ESTIMATES OF 65 KNOTS. ANIMATED VISIBLE SATELLITE IMAGERY INDICATE TC 30S HAS CONTINUED TO ORGANIZE OVER THE PAST 12 HOURS AND APPEARS TO BE FORMING A 15 NM DIAMETER EYE. TROPICAL CYCLONE 30S IS FORECAST TO CONTINUE TRACKING WEST-SOUTHWESTWARD UNDER THE STEERING INFLUENCE OF THE SUBTROPICAL RIDGE TO ITS SOUTHEAST, AND THEN TRACK MORE SOUTHWARD BY THE 36 HOUR FORECAST POSITION. TROPICAL CYCLONE 30S SHOULD CONTINUE TO INTENSIFY DUE TO THE FAVORABLE UPPER LEVEL ENVIRONMENT. THE WIND RADII ARE BASED UPON A COMBINATION OF CLIMATOLOGY FOR AN AVERAGED SIZED SYSTEM AND AN EARLIER SCATTEROMETRY PASS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 190000Z0 IS 18 FEET. NEXT WARNINGS AT 191500Z6 (DTG 191357Z6) AND 200300Z5 (DTG 200157Z5). REFER TO TROPICAL CYCLONE 28S (ELAINE) WARNINGS (WTXS32 PGTW)FOR SIX-HOURLY UPDATES. REFER TO TROPICAL CYCLONE 29S WARNINGS (WTXS33 PGTW) FOR TWELVE-HOURLY UPDATES.// ========================================================================= WTXS34 PGTW 990319 15:00z SUBJ: TROPICAL CYCLONE WARNING 1. TROPICAL CYCLONE 30S (VANCE) WARNING NR 004 03 ACTIVE TROPICAL CYCLONES IN SOUTHERN HEMISPHERE MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 191200Z3 --- NEAR 14.3S8 119.6E7 MOVEMENT PAST SIX HOURS - 235 DEGREES AT 13 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 080 KT, GUSTS 100 KT RADIUS OF 050 KT WINDS - 045 NM SOUTHEAST SEMICIRCLE 035 NM ELSEWHERE RADIUS OF 035 KT WINDS - 110 NM SOUTHEAST SEMICIRCLE 090 NM ELSEWHERE REPEAT POSIT: 14.3S8 119.6E7 --- FORECASTS: 12 HRS, VALID AT: 200000Z2 --- 15.3S9 117.9E8 MAX SUSTAINED WINDS - 090 KT, GUSTS 110 KT RADIUS OF 050 KT WINDS - 050 NM SOUTHEAST SEMICIRCLE 040 NM ELSEWHERE RADIUS OF 035 KT WINDS - 120 NM SOUTHEAST SEMICIRCLE 095 NM ELSEWHERE VECTOR TO 24 HR POSIT: 215 DEG/ 11 KTS --- 24 HRS, VALID AT: 201200Z5 --- 17.1S9 116.5E3 MAX SUSTAINED WINDS - 100 KT, GUSTS 125 KT RADIUS OF 050 KT WINDS - 055 NM SOUTHEAST SEMICIRCLE 050 NM ELSEWHERE RADIUS OF 035 KT WINDS - 130 NM SOUTHEAST SEMICIRCLE 100 NM ELSEWHERE VECTOR TO 36 HR POSIT: 220 DEG/ 11 KTS --- 36 HRS, VALID AT: 210000Z3 --- 18.8S7 115.1E8 MAX SUSTAINED WINDS - 115 KT, GUSTS 140 KT RADIUS OF 100 KT WINDS - 015 NM RADIUS OF 050 KT WINDS - 060 NM SOUTHEAST SEMICIRCLE 050 NM ELSEWHERE RADIUS OF 035 KT WINDS - 135 NM SOUTHEAST SEMICIRCLE 115 NM ELSEWHERE VECTOR TO 48 HR POSIT: 195 DEG/ 10 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 211200Z6 --- 20.8S0 114.5E1 MAX SUSTAINED WINDS - 125 KT, GUSTS 150 KT RADIUS OF 100 KT WINDS - 020 NM RADIUS OF 050 KT WINDS - 060 NM EAST SEMICIRCLE OVER WATER 050 NM ELSEWHERE RADIUS OF 035 KT WINDS - 145 NM EAST SEMICIRCLE OVER WATER 120 NM ELSEWHERE OVER WATER VECTOR TO 72 HR POSIT: 170 DEG/ 10 KTS --- 72 HRS, VALID AT: 221200Z7 --- 24.9S5 115.1E8 MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND --- REMARKS: 191500Z6 POSITION NEAR 14.6S1 119.2E3. TROPICAL CYCLONE (TC) 30S (VANCE) HAS TRACKED WEST-SOUTHWESTWARD IN THE TIMOR SEA AT 13 KNOTS OVER THE PAST 06 HOURS. THE WARNING POSITION IS BASED UPON 191130Z5 ANIMATED VISIBLE SATELLITE IMAGERY. THE WARNING INTENSITY IS BASED UPON SATELLITE CURRENT INTENSITY ESTIMATES OF 77 KNOTS. ANIMATED INFRARED SATELLITE IMAGERY INDICATE TC 30S HAS ALMOST FORMED A BANDING EYE OVER THE PAST 12 HOURS. TROPICAL CYCLONE 30S IS FORECAST TO CONTINUE TRACKING WEST-SOUTHWESTWARD UNDER THE STEERING INFLUENCE OF THE SUBTROPICAL RIDGE TO ITS SOUTHEAST, AND THEN TRACK MORE SOUTHWARD BY THE 36 HOUR FORECAST POSITION. TROPICAL CYCLONE 30S SHOULD CONTINUE TO INTENSIFY AT A NORMAL RATE DUE TO THE FAVORABLE UPPER LEVEL ENVIRONMENT. LANDFALL SHOULD OCCUR ABOUT 211800Z2 OVER EXMOUTH GULF. THE WIND RADII ARE BASED UPON A COMBINATION OF CLIMATOLOGY FOR AN AVERAGED SIZED SYSTEM AND EXTRAPOLATION FROM AN EARLIER SCATTEROMETRY PASS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 191200Z3 IS 22 FEET. NEXT WARNINGS AT 192100Z3 (DTG 191957Z2), 200300Z5 (DTG 200157Z5), 200900Z1 (DTG 200757Z1) AND 201500Z8 (DTG 201357Z8). REFER TO TROPICAL CYCLONE 28S (ELAINE) WARNINGS (WTXS32 PGTW) FOR TWELVE-HOURLY UPDATES. REFER TO TROPICAL CYCLONE 29S (NONAME) WARNINGS (WTXS33 PGTW) FOR FINAL WARNING.// ========================================================================= WTXS34 PGTW 990319 21:00z 1. TROPICAL CYCLONE 30S (VANCE) WARNING NR 005 02 ACTIVE TROPICAL CYCLONES IN SOUTH INDIAN OCEAN MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 191800Z9 --- NEAR 14.7S2 118.9E9 MOVEMENT PAST SIX HOURS - 240 DEGREES AT 08 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 090 KT, GUSTS 110 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND RADIUS OF 050 KT WINDS - 045 NM SOUTHEAST SEMICIRCLE 035 NM ELSEWHERE RADIUS OF 035 KT WINDS - 110 NM SOUTHEAST SEMICIRCLE 090 NM ELSEWHERE REPEAT POSIT: 14.7S2 118.9E9 --- FORECASTS: 12 HRS, VALID AT: 200600Z8 --- 16.0S7 117.0E9 MAX SUSTAINED WINDS - 105 KT, GUSTS 130 KT RADIUS OF 100 KT WINDS - 020 NM RADIUS OF 050 KT WINDS - 050 NM SOUTHEAST SEMICIRCLE 040 NM ELSEWHERE RADIUS OF 035 KT WINDS - 120 NM SOUTHEAST SEMICIRCLE 095 NM ELSEWHERE VECTOR TO 24 HR POSIT: 215 DEG/ 11 KTS --- 24 HRS, VALID AT: 201800Z1 --- 17.7S5 115.7E4 MAX SUSTAINED WINDS - 115 KT, GUSTS 140 KT RADIUS OF 100 KT WINDS - 030 NM RADIUS OF 050 KT WINDS - 055 NM SOUTHEAST SEMICIRCLE 050 NM ELSEWHERE RADIUS OF 035 KT WINDS - 130 NM SOUTHEAST SEMICIRCLE 100 NM ELSEWHERE VECTOR TO 36 HR POSIT: 205 DEG/ 11 KTS --- 36 HRS, VALID AT: 210600Z9 --- 19.7S7 114.8E4 MAX SUSTAINED WINDS - 120 KT, GUSTS 145 KT RADIUS OF 100 KT WINDS - 040 NM SOUTHEAST SEMICIRCLE 030 NM ELSEWHERE RADIUS OF 050 KT WINDS - 060 NM SOUTHEAST SEMICIRCLE 050 NM ELSEWHERE RADIUS OF 035 KT WINDS - 135 NM SOUTHEAST SEMICIRCLE OVER WATER 115 NM ELSEWHERE OVER WATER VECTOR TO 48 HR POSIT: 185 DEG/ 10 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 211800Z2 --- 21.7S0 114.6E2 MAX SUSTAINED WINDS - 130 KT, GUSTS 160 KT RADIUS OF 100 KT WINDS - 040 NM SOUTHEAST SEMICIRCLE OVER WATER 030 NM ELSEWHERE OVER WATER RADIUS OF 050 KT WINDS - 060 NM EAST SEMICIRCLE OVER WATER 050 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 145 NM EAST SEMICIRCLE OVER WATER 120 NM ELSEWHERE OVER WATER VECTOR TO 72 HR POSIT: 170 DEG/ 10 KTS --- 72 HRS, VALID AT: 221800Z3 --- 25.6S3 115.3E0 MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT --- REMARKS: 192100Z3 POSITION NEAR 15.0S6 118.4E4. TROPICAL CYCLONE 30S (VANCE) IS MOVING WEST-SOUTHWESTWARD AT 8 KNOTS. FORECAST REASONING REMAINS THE SAME. TC30S IS BEING STEERED BY AN ANTI-CYCLONE TO ITS SOUTHEAST. IT WILL TURN TOWARD THE SOUTH AS IT FOLLOWS THE FLOW AROUND THIS MID-LEVEL HIGH. THIS STEERING WILL BE AUGMENTED BY A MID-LATITUDE WAVE APPROACHING FROM THE WEST, FORCING TC30S TO RECURVE INTO THE AUSTRALIAN COAST. INTENSIFICATION SHOULD CONTINUE AT A NORMAL RATE UNTIL LANDFALL. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 191800Z9 IS 24 FEET. NEXT WARNINGS AT 200300Z5 (DTG 200157Z5), 200900Z1 (DTG 200757Z1), 201500Z8 (DTG 201357Z8) AND 202100Z5 (DTG 201957Z4). REFER TO TROPICAL CYCLONE 28S (ELAINE) WARNINGS (WTXS32 PGTW) FOR SIX-HOURLY UPDATES.// ========================================================================= WTXS34 PGTW 990320 03:00z 1. TROPICAL CYCLONE 30S (VANCE) WARNING NR 006 01 ACTIVE TROPICAL CYCLONES IN SOUTH INDIAN OCEAN MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 200000Z2 --- NEAR 15.4S0 117.8E7 MOVEMENT PAST SIX HOURS - 235 DEGREES AT 13 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 090 KT, GUSTS 110 KT RADIUS OF 050 KT WINDS - 045 NM SOUTHEAST SEMICIRCLE 035 NM ELSEWHERE RADIUS OF 035 KT WINDS - 110 NM SOUTHEAST SEMICIRCLE 090 NM ELSEWHERE REPEAT POSIT: 15.4S0 117.8E7 --- FORECASTS: 12 HRS, VALID AT: 201200Z5 --- 17.1S9 116.1E9 MAX SUSTAINED WINDS - 105 KT, GUSTS 130 KT RADIUS OF 100 KT WINDS - 020 NM RADIUS OF 050 KT WINDS - 050 NM SOUTHEAST SEMICIRCLE 040 NM ELSEWHERE RADIUS OF 035 KT WINDS - 120 NM SOUTHEAST SEMICIRCLE 095 NM ELSEWHERE VECTOR TO 24 HR POSIT: 205 DEG/ 12 KTS --- 24 HRS, VALID AT: 210000Z3 --- 19.2S2 115.0E7 MAX SUSTAINED WINDS - 115 KT, GUSTS 140 KT RADIUS OF 100 KT WINDS - 030 NM RADIUS OF 050 KT WINDS - 055 NM SOUTHEAST SEMICIRCLE 050 NM ELSEWHERE RADIUS OF 035 KT WINDS - 130 NM SOUTHEAST SEMICIRCLE 100 NM ELSEWHERE VECTOR TO 36 HR POSIT: 195 DEG/ 11 KTS --- 36 HRS, VALID AT: 211200Z6 --- 21.3S6 114.5E1 MAX SUSTAINED WINDS - 125 KT, GUSTS 150 KT RADIUS OF 100 KT WINDS - 040 NM EAST SEMICIRCLE OVER WATER 030 NM ELSEWHERE OVER WATER RADIUS OF 050 KT WINDS - 060 NM EAST SEMICIRCLE OVER WATER 050 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 135 NM EAST SEMICIRCLE OVER WATER 115 NM ELSEWHERE OVER WATER VECTOR TO 48 HR POSIT: 175 DEG/ 11 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 220000Z4 --- 23.5S0 114.7E3 MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND VECTOR TO 72 HR POSIT: 165 DEG/ 11 KTS --- 72 HRS, VALID AT: 230000Z5 --- 27.6S5 115.8E5 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND --- REMARKS: 200300Z5 POSITION NEAR 15.8S4 117.4E3. TROPICAL CYCLONE 30S (VANCE) IS MOVING SOUTHWESTWARD AT 13 KNOTS. FORECAST REASONING REMAINS THE SAME. TC 30S SHOULD RECURVE UNDER THE STEERING INFLUENCE OF A MIDLEVEL ANTICYCLONE TO ITS SOUTHEAST, AND CONTINUE TO INTENSIFY UNTIL MAKING LANDFALL IN NORTHWEST AUSTRALIA. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 200000Z IS 24 FEET. NEXT WARNINGS AT 200900Z1 (DTG 200757Z1), 201500Z8 (DTG 201357Z8), 202100Z5 (DTG 201957Z4) AND 210300Z6 (DTG 210157Z6).// ========================================================================= WTXS34 PGTW 990320 09:00z 1. TROPICAL CYCLONE 30S (VANCE) WARNING NR 007 02 ACTIVE TROPICAL CYCLONES IN SOUTHERN HEMISPHERE MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 200600Z8 --- NEAR 15.9S5 117.2E1 MOVEMENT PAST SIX HOURS - 230 DEGREES AT 08 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 105 KT, GUSTS 130 KT RADIUS OF 100 KT WINDS - 010 NM RADIUS OF 050 KT WINDS - 045 NM SOUTHEAST SEMICIRCLE 035 NM ELSEWHERE RADIUS OF 035 KT WINDS - 110 NM SOUTHEAST SEMICIRCLE 090 NM ELSEWHERE REPEAT POSIT: 15.9S5 117.2E1 --- FORECASTS: 12 HRS, VALID AT: 201800Z1 --- 17.1S9 116.1E9 MAX SUSTAINED WINDS - 110 KT, GUSTS 135 KT RADIUS OF 100 KT WINDS - 020 NM RADIUS OF 050 KT WINDS - 050 NM SOUTHEAST SEMICIRCLE 040 NM ELSEWHERE RADIUS OF 035 KT WINDS - 120 NM SOUTHEAST SEMICIRCLE 095 NM ELSEWHERE VECTOR TO 24 HR POSIT: 210 DEG/ 10 KTS --- 24 HRS, VALID AT: 210600Z9 --- 18.9S8 115.0E7 MAX SUSTAINED WINDS - 120 KT, GUSTS 145 KT RADIUS OF 100 KT WINDS - 030 NM RADIUS OF 050 KT WINDS - 055 NM SOUTHEAST SEMICIRCLE 050 NM ELSEWHERE RADIUS OF 035 KT WINDS - 130 NM SOUTHEAST SEMICIRCLE 100 NM ELSEWHERE VECTOR TO 36 HR POSIT: 195 DEG/ 10 KTS --- 36 HRS, VALID AT: 211800Z2 --- 20.8S0 114.5E1 MAX SUSTAINED WINDS - 130 KT, GUSTS 160 KT RADIUS OF 100 KT WINDS - 040 NM EAST SEMICIRCLE 030 NM ELSEWHERE RADIUS OF 050 KT WINDS - 060 NM EAST SEMICIRCLE 050 NM ELSEWHERE RADIUS OF 035 KT WINDS - 140 NM EAST SEMICIRCLE OVER WATER 120 NM ELSEWHERE OVER WATER VECTOR TO 48 HR POSIT: 180 DEG/ 09 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 220600Z0 --- 22.6S0 114.4E0 MAX SUSTAINED WINDS - 100 KT, GUSTS 125 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND RADIUS OF 050 KT WINDS - 035 NM EAST SEMICIRCLE OVER WATER 025 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 100 NM EAST SEMICIRCLE OVER WATER 080 NM ELSEWHERE OVER WATER VECTOR TO 72 HR POSIT: 165 DEG/ 10 KTS --- 72 HRS, VALID AT: 230600Z1 --- 26.4S2 115.5E2 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND --- REMARKS: 200900Z1 POSITION NEAR 16.2S9 116.9E7. TROPICAL STORM 30S (VANCE) HAS TRACKED TOWARDS THE SOUTHWEST AT 8 KNOTS DURING THE PAST 6 HOURS. THE WARNING POSITION IS BASED ON 200530Z0 VISIBLE SATELLITE IMAGERY. THE WARNING INTENSITY IS BASED ON SATELLITE CURRENT INTENSITY ESTIMATES OF T5.5 AND T6.0 (102 AND 115 KNOTS, RESPECTFULLY). TC 30S (VANCE) HAS CONTINUED TO TRACK UNDER THE STEERING INFLUENCE OF THE SUBTROPICAL RIDGE TO THE SOUTHEAST. THIS RIDGE IS EXPECTED TO REMAIN THE DOMINANT STEERING INFLUENCE AS IT STEERS TC 30S (VANCE) TOWARDS THE SOUTHWEST DURING THE INITIAL 24 HOURS OF THE FORECAST PERIOD. AFTERWARDS, THE SYSTEM IS FORECAST TO TRACK SOUTHWARD AS IT MOVES AROUND THE WESTERN AXIS OF THE SUBTROPICAL RIDGE. TC 30S (VANCE) IS EXPECTED TO INTENSIFY UNTIL MAKING LANDFALL OVER NORTHWEST AUSTRALIA AROUND THE 48 HOUR FORECAST POSITION. TC 30S (VANCE) IS FORECAST TO QUICKLY WEAKEN AND BEGIN TO DISSIPATE AS THE SYSTEM INTERACTS WITH LAND. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 200600Z IS 29 FEET. REFER TO WWIO30 PGFW FOR ADDITIONAL SEA HEIGHT INFORMATION. NEXT WARNINGS AT 201500Z8 (DTG 201357Z8), 202100Z5 (DTG 201957Z4), 210300Z6 (DTG 210157Z6) AND 210900Z2 (DTG 210757Z2). REFER TO TROPICAL CYCLONE 28S (ELAINE) WARNINGS (WTXS32 PGTW) FOR THE FINAL WARNING ON THIS SYSTEM. ========================================================================= WTXS34 PGTW 990320 15:00z 1. TROPICAL CYCLONE 30S (VANCE) WARNING NR 008 02 ACTIVE TROPICAL CYCLONES IN SOUTHERN HEMISPHERE MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 201200Z5 --- NEAR 16.6S3 116.7E5 MOVEMENT PAST SIX HOURS - 215 DEGREES AT 08 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 120 KT, GUSTS 145 KT RADIUS OF 100 KT WINDS - 015 NM RADIUS OF 050 KT WINDS - 060 NM SOUTHEAST SEMICIRCLE 055 NM ELSEWHERE RADIUS OF 035 KT WINDS - 120 NM SOUTHEAST SEMICIRCLE 110 NM ELSEWHERE REPEAT POSIT: 16.6S3 116.7E5 --- FORECASTS: 12 HRS, VALID AT: 210000Z3 --- 17.8S6 115.6E3 MAX SUSTAINED WINDS - 130 KT, GUSTS 160 KT RADIUS OF 100 KT WINDS - 020 NM RADIUS OF 050 KT WINDS - 065 NM SOUTHEAST SEMICIRCLE 060 NM ELSEWHERE RADIUS OF 035 KT WINDS - 130 NM SOUTHEAST SEMICIRCLE 120 NM ELSEWHERE VECTOR TO 24 HR POSIT: 210 DEG/ 09 KTS --- 24 HRS, VALID AT: 211200Z6 --- 19.4S4 114.7E3 MAX SUSTAINED WINDS - 135 KT, GUSTS 165 KT RADIUS OF 100 KT WINDS - 025 NM RADIUS OF 050 KT WINDS - 075 NM SOUTHEAST SEMICIRCLE 065 NM ELSEWHERE RADIUS OF 035 KT WINDS - 150 NM SOUTHEAST SEMICIRCLE OVER WATER 140 NM ELSEWHERE OVER WATER VECTOR TO 36 HR POSIT: 195 DEG/ 08 KTS --- 36 HRS, VALID AT: 220000Z4 --- 21.0S3 114.3E9 MAX SUSTAINED WINDS - 140 KT, GUSTS 170 KT RADIUS OF 100 KT WINDS - 030 NM 030 NM ELSEWHERE RADIUS OF 050 KT WINDS - 080 NM EAST SEMICIRCLE OVER WATER 070 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 160 NM EAST SEMICIRCLE OVER WATER 150 NM ELSEWHERE OVER WATER VECTOR TO 48 HR POSIT: 185 DEG/ 09 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 221200Z7 --- 22.7S1 114.2E8 MAX SUSTAINED WINDS - 090 KT, GUSTS 110 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND RADIUS OF 050 KT WINDS - 040 NM EAST SEMICIRCLE OVER WATER 035 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 100 NM EAST SEMICIRCLE OVER WATER 080 NM ELSEWHERE OVER WATER VECTOR TO 72 HR POSIT: 165 DEG/ 09 KTS --- 72 HRS, VALID AT: 231200Z8 --- 26.3S1 115.2E9 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND --- REMARKS: 201500Z8 POSITION NEAR 16.9S6 116.4E2. TROPICAL CYCLONE 30S (VANCE) HAS TRACKED TOWARDS THE SOUTHWEST AT 8 KNOTS DURING THE PAST 6 HOURS. THE WARNING POSITION IS BASED ON 201130Z7 INFRARED SATELLITE IMAGERY. THE WARNING INTENSITY IS BASED SATELLITE CURRENT INTENSITY ESTIMATES OF T6.0 AND T6.5 (115 AND 127 KNOTS, RESPECTFULLY). TC 30S (VANCE) HAS CONTINUED TO TRACK UNDER THE STEERING INFLUENCE OF THE SUBTROPICAL RIDGE TO THE SOUTHEAST. THIS RIDGE IS EXPECTED TO REMAIN THE DOMINANT STEERING INFLUENCE AS IT STEERS THE SYSTEM TOWARDS THE SOUTHWEST TO SOUTH-SOUTHWEST DURING THE INITIAL 12 TO 24 HOURS. AFTERWARDS, THE SYSTEM IS FORECAST TO TRACK SOUTHWARD AS IT MOVES AROUND THE WESTERN AXIS OF THE SUBTROPICAL RIDGE. TC 30S (VANCE) HAS FURTHER INTENSIFIED AS IT REMAINS IN A HIGHLY FAVORABLE ENVIRONMENT. INTENSIFICATION IS FORECAST TO CONTINUE UNTIL THE SYSTEM BEGINS TO INTERACT WITH LAND BETWEEN THE 36 AND 48 HOUR FORECAST POSITION. RAPID WEAKENING IS FORECAST TO OCCUR AS TC 30S (VANCE) MOVES INLAND. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 201200Z IS 29 FEET. REFER TO WWIO31 PGFW FOR ADDITIONAL SEA HEIGHT INFORMATION. NEXT WARNINGS AT 202100Z5 (DTG 201957Z4), 210300Z6 (DTG 210157Z6), 210900Z2 (DTG 210757Z2) AND 211500Z9 (DTG 211357Z9). REFER TO TROPICAL CYCLONE 28S (ELAINE) WARNINGS (WTXS32 PGTW) FOR THE FINAL WARNING ON THE SYSTEM. ========================================================================= WTXS34 PGTW 990320 21:00z 1. TROPICAL CYCLONE 30S (VANCE) WARNING NR 009 01 ACTIVE TROPICAL CYCLONES IN SOUTH INDIAN OCEAN MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 201800Z1 --- NEAR 17.3S1 116.2E0 MOVEMENT PAST SIX HOURS - 215 DEGREES AT 08 KTS POSITION ACCURATE TO WITHIN 030 NM POSITION BASED ON EYE FIXED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 125 KT, GUSTS 150 KT RADIUS OF 100 KT WINDS - 015 NM RADIUS OF 050 KT WINDS - 060 NM SOUTHEAST SEMICIRCLE 055 NM ELSEWHERE RADIUS OF 035 KT WINDS - 120 NM SOUTHEAST SEMICIRCLE 110 NM ELSEWHERE REPEAT POSIT: 17.3S1 116.2E0 --- FORECASTS: 12 HRS, VALID AT: 210600Z9 --- 18.5S4 115.1E8 MAX SUSTAINED WINDS - 130 KT, GUSTS 160 KT RADIUS OF 100 KT WINDS - 020 NM RADIUS OF 050 KT WINDS - 065 NM SOUTHEAST SEMICIRCLE 060 NM ELSEWHERE RADIUS OF 035 KT WINDS - 130 NM SOUTHEAST SEMICIRCLE 120 NM ELSEWHERE VECTOR TO 24 HR POSIT: 195 DEG/ 09 KTS --- 24 HRS, VALID AT: 211800Z2 --- 20.2S4 114.6E2 MAX SUSTAINED WINDS - 140 KT, GUSTS 170 KT RADIUS OF 100 KT WINDS - 025 NM RADIUS OF 050 KT WINDS - 075 NM SOUTHEAST SEMICIRCLE 065 NM ELSEWHERE RADIUS OF 035 KT WINDS - 150 NM SOUTHEAST SEMICIRCLE OVER WATER 140 NM ELSEWHERE VECTOR TO 36 HR POSIT: 190 DEG/ 09 KTS --- 36 HRS, VALID AT: 220600Z0 --- 21.9S2 114.2E8 MAX SUSTAINED WINDS - 140 KT, GUSTS 170 KT RADIUS OF 100 KT WINDS - 030 NM OVER WATER 030 NM ELSEWHERE OVER WATER RADIUS OF 050 KT WINDS - 080 NM EAST SEMICIRCLE OVER WATER 070 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 160 NM EAST SEMICIRCLE OVER WATER 150 NM ELSEWHERE OVER WATER VECTOR TO 48 HR POSIT: 170 DEG/ 10 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 221800Z3 --- 23.9S4 114.5E1 MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND RADIUS OF 050 KT WINDS - 040 NM EAST SEMICIRCLE OVER WATER 035 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 100 NM EAST SEMICIRCLE OVER WATER 080 NM ELSEWHERE OVER WATER VECTOR TO 72 HR POSIT: 150 DEG/ 14 KTS --- 72 HRS, VALID AT: 231800Z4 --- 28.7S7 117.7E6 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND --- REMARKS: 202100Z5 POSITION NEAR 17.6S4 115.9E6. TROPICAL CYCLONE 30S (VANCE) IS MOVING SOUTHWESTWARD AT 8 KNOTS. FORECAST PHILOSOPHY REMAINS THE SAME. TC 30S WILL CONTINUE TO TRACK AROUND THE ANTICYCLONE TO ITS SOUTHEAST, RECURVING INTO THE NORTHWEST AUSTRALIAN COAST. THE WARNING INTENSITY IS BASED ON 201730 SATELLITE DATA SHOWING A 13NM CLOUD FILLED EYE. INTENSIFICATION SHOULD CONTINUE UNTIL NEAR LANDFALL DUE TO A LOW VERTICAL WIND SHEAR ENVIONMENT. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 201800Z1 IS 30 FEET. NEXT WARNINGS AT 210300Z6 (DTG 210157Z6), 210900Z2 (DTG 210757Z2), 211500Z9 (DTG 211357Z9) AND 212100Z6 (DTG 211957Z5).// ========================================================================= WTXS34 PGTW 990321 03:00z 1. TROPICAL CYCLONE 30S (VANCE) WARNING NR 010 01 ACTIVE TROPICAL CYCLONES IN SOUTH INDIAN OCEAN MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 210000Z3 --- NEAR 17.9S7 115.7E4 MOVEMENT PAST SIX HOURS - 220 DEGREES AT 08 KTS POSITION ACCURATE TO WITHIN 030 NM POSITION BASED ON EYE FIXED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 125 KT, GUSTS 150 KT RADIUS OF 100 KT WINDS - 015 NM RADIUS OF 050 KT WINDS - 060 NM SOUTHEAST SEMICIRCLE 055 NM ELSEWHERE RADIUS OF 035 KT WINDS - 120 NM SOUTHEAST SEMICIRCLE 110 NM ELSEWHERE REPEAT POSIT: 17.9S7 115.7E4 --- FORECASTS: 12 HRS, VALID AT: 211200Z6 --- 19.2S2 114.8E4 MAX SUSTAINED WINDS - 130 KT, GUSTS 160 KT RADIUS OF 100 KT WINDS - 020 NM RADIUS OF 050 KT WINDS - 065 NM SOUTHEAST SEMICIRCLE 060 NM ELSEWHERE RADIUS OF 035 KT WINDS - 130 NM SOUTHEAST SEMICIRCLE 120 NM ELSEWHERE VECTOR TO 24 HR POSIT: 195 DEG/ 08 KTS --- 24 HRS, VALID AT: 220000Z4 --- 20.7S9 114.4E0 MAX SUSTAINED WINDS - 120 KT, GUSTS 145 KT RADIUS OF 100 KT WINDS - 015 NM RADIUS OF 050 KT WINDS - 060 NM SOUTHEAST SEMICIRCLE OVER WATER 055 NM ELSEWHERE RADIUS OF 035 KT WINDS - 120 NM SOUTHEAST SEMICIRCLE OVER WATER 110 NM ELSEWHERE OVER WATER VECTOR TO 36 HR POSIT: 180 DEG/ 13 KTS --- 36 HRS, VALID AT: 221200Z7 --- 23.3S8 114.4E0 MAX SUSTAINED WINDS - 070 KT, GUSTS 085 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND RADIUS OF 050 KT WINDS - 040 NM EAST SEMICIRCLE OVER WATER 035 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 100 NM EAST SEMICIRCLE OVER WATER 080 NM ELSEWHERE OVER WATER VECTOR TO 48 HR POSIT: 160 DEG/ 26 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 230000Z5 --- 28.2S2 116.5E3 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND --- REMARKS: 210300Z6 POSITION NEAR 18.2S1 115.5E2. TROPICAL CYCLONE 30S (VANCE) IS MOVING SOUTHWESTWARD AT 8 KNOTS. FORECAST REASONING REMAINS THE SAME. TC 30S IS EXPECTED TO MAKE LANDFALL NEAR THE NORTHWEST CAPE WITHIN THE NEXT 24 TO 36 HOURS. IT WILL ACCELERATE OVER LAND AS IT RECURVES TO THE SOUTHEAST, AND SHOULD DISSIPATE BY 48 HOURS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 210000Z3 IS 30 FEET. NEXT WARNINGS AT 210900Z2 (DTG 210757Z2), 211500Z9 (DTG 211357Z9), 212100Z6 (DTG 211957Z5) AND 220300Z7 (DTG 220157Z7).// ========================================================================= WTXS34 PGTW 990321 09:00z SUBJ: TROPICAL CYCLONE WARNING 1. TROPICAL CYCLONE 30S (VANCE) WARNING NR 011 01 ACTIVE TROPICAL CYCLONES IN SOUTHERN HEMISPHERE MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 210600Z9 --- NEAR 18.6S5 114.9E5 MOVEMENT PAST SIX HOURS - 225 DEGREES AT 10 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 125 KT, GUSTS 150 KT RADIUS OF 100 KT WINDS - 020 NM RADIUS OF 050 KT WINDS - 075 NM SOUTHEAST SEMICIRCLE 065 NM ELSEWHERE RADIUS OF 035 KT WINDS - 170 NM SOUTHEAST SEMICIRCLE OVER WATER 155 NM ELSEWHERE OVER WATER REPEAT POSIT: 18.6S5 114.9E5 --- FORECASTS: 12 HRS, VALID AT: 211800Z2 --- 20.3S5 114.0E6 MAX SUSTAINED WINDS - 125 KT, GUSTS 150 KT RADIUS OF 100 KT WINDS - 020 NM RADIUS OF 050 KT WINDS - 070 NM EAST SEMICIRCLE 060 NM ELSEWHERE RADIUS OF 035 KT WINDS - 160 NM EAST SEMICIRCLE OVER WATER 150 NM ELSEWHERE OVER WATER VECTOR TO 24 HR POSIT: 185 DEG/ 11 KTS --- 24 HRS, VALID AT: 220600Z0 --- 22.4S8 113.8E3 MAX SUSTAINED WINDS - 115 KT, GUSTS 140 KT RADIUS OF 100 KT WINDS - 015 NM EAST SEMICIRCLE OVER WATER 010 NM ELSEWHERE OVER WATER RADIUS OF 050 KT WINDS - 060 NM EAST SEMICIRCLE OVER WATER 050 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 140 NM EAST SEMICIRCLE OVER WATER 130 NM ELSEWHERE OVER WATER VECTOR TO 36 HR POSIT: 165 DEG/ 14 KTS --- 36 HRS, VALID AT: 221800Z3 --- 25.0S7 114.7E3 MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND RADIUS OF 050 KT WINDS - 030 NM NORTHEAST SEMICIRCLE OVER WATER 020 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 080 NM NORTHEAST SEMICIRCLE OVER WATER 070 NM ELSEWHERE OVER WATER VECTOR TO 48 HR POSIT: 155 DEG/ 17 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 230600Z1 --- 28.1S1 116.5E3 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND --- REMARKS: 210900Z2 POSITION NEAR 19.0S0 114.7E3. TROPICAL CYCLONE 30S (VANCE) HAS TRACKED SOUTHWESTWARD AT 10 KNOTS DURING PAST SIX HOURS. SATELLITE CURRENT INTENSITY ESTIMATES FOR THE SYSTEM REMAIN AT T6.5 (125 KNOTS). THE FORECAST PHILOSOPHY REMAINS THE SAME AS THE PREVIOUS WARNINGS. THE SYSTEM IS FORECAST TO RECURVE AROUND THE WESTERN AXIS OF THE STEERING SUBTROPICAL RIDGE TO THE SOUTHEAST. TC 30S (VANCE) IS EXPECTED TO MAKE LANDFALL OVER EXTREME NORTHWESTERN AUSTRALIA AND MOVE INLAND. THE SYSTEM HAS BEGUN TO ENTRAIN DRIER AIR OFF THE CONTINENT, INHIBITING FURTHER INTENSIFICATION. TC 30S (VANCE) IS FORECAST TO REMAIN AT A RELATIVELY STEADY INTENSITY DURING THE INITIAL 12 HOURS, THEN SLOWLY BEGIN TO WEAKEN UNTIL MAKING LANDFALL NEAR THE 24 HOUR FORECAST POSITION. THE SYSTEM IS THEN FORECAST TO RAPIDLY WEAKEN, FINALLY DISSIPATING OVER LAND BY THE 48 HOUR FORECAST POSITION. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 210600Z9 IS 30 FEET. REFER TO WWIO30 PGFW FOR ADDITIONAL SEA HEIGHT INFORMATION. NEXT WARNINGS AT 211500Z9 (DTG 211357Z9), 212100Z6 (DTG 211957Z5), 220300Z7 (DTG 220157Z7) AND 220900Z3 (DTG 220757Z3).// ========================================================================= WTXS34 PGTW 990321 15:00z SUBJ: TROPICAL CYCLONE WARNING 1. TROPICAL CYCLONE 30S (VANCE) WARNING NR 012 01 ACTIVE TROPICAL CYCLONES IN SOUTHERN HEMISPHERE MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 211200Z6 --- NEAR 19.3S3 114.6E2 MOVEMENT PAST SIX HOURS - 200 DEGREES AT 08 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 125 KT, GUSTS 150 KT RADIUS OF 100 KT WINDS - 020 NM EAST SEMICIRCLE 015 NM ELSEWHERE RADIUS OF 050 KT WINDS - 075 NM SOUTHEAST SEMICIRCLE 065 NM ELSEWHERE RADIUS OF 035 KT WINDS - 160 NM SOUTHEAST SEMICIRCLE OVER WATER 150 NM ELSEWHERE REPEAT POSIT: 19.3S3 114.6E2 --- FORECASTS: 12 HRS, VALID AT: 220000Z4 --- 21.0S3 114.1E7 MAX SUSTAINED WINDS - 120 KT, GUSTS 145 KT RADIUS OF 100 KT WINDS - 020 NM EAST SEMICIRCLE 015 NM ELSEWHERE RADIUS OF 050 KT WINDS - 070 NM EAST SEMICIRCLE OVER WATER 060 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 150 NM EAST SEMICIRCLE OVER WATER 130 NM ELSEWHERE OVER WATER VECTOR TO 24 HR POSIT: 180 DEG/ 11 KTS --- 24 HRS, VALID AT: 221200Z7 --- 23.3S8 114.2E8 MAX SUSTAINED WINDS - 080 KT, GUSTS 100 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND RADIUS OF 050 KT WINDS - 040 NM EAST SEMICIRCLE OVER WATER 030 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 110 NM EAST SEMICIRCLE OVER WATER 090 NM ELSEWHERE OVER WATER VECTOR TO 36 HR POSIT: 160 DEG/ 15 KTS --- 36 HRS, VALID AT: 230000Z5 --- 26.1S9 115.4E1 MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND VECTOR TO 48 HR POSIT: 150 DEG/ 17 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 231200Z8 --- 29.0S1 117.4E3 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND --- REMARKS: 211500Z9 POSITION NEAR 19.7S7 114.5E1. TROPICAL CYCLONE 30S (VANCE) HAS TRACKED SOUTHWESTWARD AT 08 KNOTS DURING THE PAST SIX HOURS. SATELLITE CURRENT INTENSITY ESTIMATES OF THE SYSTEM REMAIN AT T6.5 (125 KNOTS). THE FORECAST PHILOSOPHY REMAINS THE SAME WITH TC 30S (VANCE) FORECAST TO RECURVE AROUND THE WESTERN AXIS OF THE STEERING SUBTROPICAL RIDGE TO THE SOUTHEAST. THE SYSTEM IS EXPECTED TO MAKE LANDFALL OVER EXTREME NORTHWESTERN AUSTRALIA AND MOVE INLAND. THE SYSTEM CONTINUES TO ENTRAIN DRIER AIR FROM THE CONTINENT, INHIBITING FURTHER INTENSIFICATION. TC 30S (VANCE) IS FORECAST TO REMAIN AT A RELATIVELY STEADY INTENSITY UNTIL MAKING LANDFALL BEFORE THE 24 HOUR FORECAST PERIOD. THE SYSTEM IS THEN FORECAST TO RAPIDLY WEAKEN, FINALLY DISSIPATING OVER LAND BY THE 48 HOUR FORECAST POSITION. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 211200Z6 IS 30 FEET. NEXT WARNINGS AT 212100Z6 (DTG 211957Z5), 220300Z7 (DTG 220157Z7), 220900Z3 (DTG 220757Z3) AND 221500Z0 (DTG 221357Z0).// ========================================================================= WTXS34 PGTW 990321 21:00z 1. TROPICAL CYCLONE 30S (VANCE) WARNING NR 013 01 ACTIVE TROPICAL CYCLONES IN SOUTH INDIAN OCEAN MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 211800Z2 --- NEAR 20.2S4 114.4E0 MOVEMENT PAST SIX HOURS - 190 DEGREES AT 09 KTS POSITION ACCURATE TO WITHIN 030 NM POSITION BASED ON EYE FIXED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 120 KT, GUSTS 145 KT RADIUS OF 100 KT WINDS - 020 NM EAST SEMICIRCLE 015 NM ELSEWHERE RADIUS OF 050 KT WINDS - 075 NM SOUTHEAST SEMICIRCLE 065 NM ELSEWHERE RADIUS OF 035 KT WINDS - 160 NM SOUTHEAST SEMICIRCLE OVER WATER 150 NM ELSEWHERE REPEAT POSIT: 20.2S4 114.4E0 --- FORECASTS: 12 HRS, VALID AT: 220600Z0 --- 22.0S4 114.1E7 MAX SUSTAINED WINDS - 110 KT, GUSTS 135 KT RADIUS OF 100 KT WINDS - 020 NM EAST SEMICIRCLE OVER WATER 015 NM ELSEWHERE OVER WATER RADIUS OF 050 KT WINDS - 070 NM EAST SEMICIRCLE OVER WATER 060 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 160 NM EAST SEMICIRCLE OVER WATER 150 NM ELSEWHERE OVER WATER VECTOR TO 24 HR POSIT: 170 DEG/ 13 KTS --- 24 HRS, VALID AT: 221800Z3 --- 24.5S1 114.7E3 MAX SUSTAINED WINDS - 080 KT, GUSTS 100 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND RADIUS OF 050 KT WINDS - 040 NM EAST SEMICIRCLE OVER WATER 030 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 110 NM EAST SEMICIRCLE OVER WATER 090 NM ELSEWHERE OVER WATER VECTOR TO 36 HR POSIT: 155 DEG/ 16 KTS --- 36 HRS, VALID AT: 230600Z1 --- 27.4S3 116.3E1 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND --- REMARKS: 212100Z6 POSITION NEAR 20.6S8 114.3E9. TROPICAL CYCLONE 30S (VANCE) IS MOVING SOUTHWARD AT 9 KNOTS. THE WARNING POSITION AND INTENSITY ARE BASED ON 211730Z4 INFRARED AND MICROWAVE SATELLITE IMAGERY. THE 35 KNOT WIND RADIUS HAS BEEN VERIFIED BY SYNOPTIC REPORTS FROM THE AUSTRALIAN COAST. FORECAST REASONING REMAINS THE SAME. TC 30S WILL CONTINUE SOUTHWARD AND DISSIPATE OVER LAND WITHIN THE NEXT 36 HOURS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 211800Z2 IS 28 FEET. NEXT WARNINGS AT 220300Z7 (DTG 220157Z7), 220900Z3 (DTG 220757Z3), 221500Z0 (DTG 221357Z0) AND 222100Z7 (DTG 221957Z6). REFER TO TROPICAL CYCLONE 29S (NONAME) WARNINGS (WTXS33 PGTW)FOR SIX-HOURLY UPDATES.// ========================================================================= WTXS34 PGTW 990322 03:00z 1. TROPICAL CYCLONE 30S (VANCE) WARNING NR 014 01 ACTIVE TROPICAL CYCLONES IN SOUTH INDIAN OCEAN MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 220000Z4 --- NEAR 21.8S1 114.4E0 MOVEMENT PAST SIX HOURS - 180 DEGREES AT 12 KTS POSITION ACCURATE TO WITHIN 030 NM POSITION BASED ON EYE FIXED BY A COMBINATION OF SATELLITE, RADAR AND SYNOPTIC DATA PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 125 KT, GUSTS 150 KT RADIUS OF 100 KT WINDS - 020 NM EAST SEMICIRCLE OVER WATER 015 NM ELSEWHERE OVER WATER RADIUS OF 050 KT WINDS - 075 NM EAST SEMICIRCLE OVER WATER 065 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 160 NM EAST SEMICIRCLE OVER WATER 150 NM ELSEWHERE OVER WATER REPEAT POSIT: 21.4S7 114.4E0 --- FORECASTS: 12 HRS, VALID AT: 221200Z7 --- 27.8S4 116.5E3 MAX SUSTAINED WINDS - 080 KT, GUSTS 100 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND RADIUS OF 050 KT WINDS - 070 NM EAST SEMICIRCLE OVER WATER 060 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 160 NM EAST SEMICIRCLE OVER WATER 150 NM ELSEWHERE OVER WATER VECTOR TO 24 HR POSIT: 155 DEG/ 15 KTS --- 24 HRS, VALID AT: 230000Z5 --- 26.4S2 116.4E2 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND --- REMARKS: 220300Z7 POSITION NEAR 22.5S4 114.3E1. TROPICAL CYCLONE 30S (VANCE) IS MOVING SOUTHWARD AT 15 KNOTS. THE SYSTEM REMAINS VERY STRONG, WITH SATELLITE ANALYSIS INDICATING 125 KNOT MAXIMUM SUSTAINED WINDS. THE 50 AND 35 KNOT WIND RADII HAVE BEEN CONFIRMED BY SYNOPTIC DATA FROM LEARMOUTH (WMO 94301 AND ONSLOW (WMO 94305). THE SYSTEM HAS A 30NM DIAMTER EYE, WHICH SHOULD PASS BETWEEN LEARMOUTH AND ONSLOW WITHIN THE NEXT FEW HOURS. TC 30S IS FORECAST TO DISSIPATE ASHORE WITHIN 24 HOURS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 220000Z IS 28 FEET. NEXT WARNINGS AT 220900Z3 (DTG 220757Z3), 221500Z0 (DTG 221357Z0) AND 222100Z7 (DTG 221957Z6).// ========================================================================= WTXS34 PGTW 990322 09:00z SUBJ: TROPICAL CYCLONE WARNING 1. TROPICAL CYCLONE 30S (VANCE) WARNING NR 015 01 ACTIVE TROPICAL CYCLONE IN SOUTHERN HEMISPHERE MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 220600Z0 --- NEAR 23.0S5 114.3E9 MOVEMENT PAST SIX HOURS - 180 DEGREES AT 14 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 100 KT, GUSTS 125 KT RADIUS OF 050 KT WINDS - 065 NM EAST SEMICIRCLE OVER WATER 045 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 140 NM EAST SEMICIRCLE OVER WATER 110 NM ELSEWHERE OVER WATER REPEAT POSIT: 23.0S5 114.3E9 --- FORECASTS: 12 HRS, VALID AT: 221800Z3 --- 25.7S4 115.0E7 MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND RADIUS OF 050 KT WINDS - 030 NM NORTHEAST SEMICIRCLE OVER WATER 020 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 090 NM NORTHEAST SEMICIRCLE OVER WATER 070 NM ELSEWHERE OVER WATER VECTOR TO 24 HR POSIT: 150 DEG/ 18 KTS --- 24 HRS, VALID AT: 230600Z1 --- 28.7S7 117.1E0 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND --- REMARKS: 220900Z3 POSITION NEAR 23.7S2 114.5E1. TROPICAL CYCLONE 30S (VANCE) HAS TRACKED TOWARDS THE SOUTH AT 14 KNOTS OVER THE PAST SIX HOURS, MAKING LANDFALL IN THE SOUTHERN EXMOUTH GULF. PREVIOUS SYNOPTIC DATA CONFIRMED THE 50 AND 35 KNOT WIND RADII. SATELLITE CURRENT INTENSITY ESTIMATES INDICATE THE SYSTEM HAS DECREASED INTENSITY TO T5.5 (102 KNOTS). TC 30S (VANCE) IS FORECAST TO CONTINUE DISSIPATING DUE TO INTERACTION WITH LAND. THE SYSTEM IS FORECAST TO ACCELERATE SOUTHSOUTHEASTWARD, DISSIPATING OVER LAND BY THE 24 HOUR FORECAST PERIOD. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 220600Z0 IS 24 FEET. NEXT WARNINGS AT 221500Z0 (DTG 221357Z0), 222100Z7 (DTG 221957Z6), AND 230300Z8 (DTG 230157Z8).// ========================================================================= WTXS34 PGTW 990322 15:00z SUBJ: TROPICAL CYCLONE WARNING 1. TROPICAL CYCLONE 30S (VANCE) WARNING NR 016 01 ACTIVE TROPICAL CYCLONE IN SOUTHERN HEMISPHERE MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 221200Z7 --- NEAR 24.9S5 115.0E7 MOVEMENT PAST SIX HOURS - 160 DEGREES AT 20 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 DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND RADIUS OF 050 KT WINDS - 040 NM NORTHEAST SEMICIRCLE OVER WATER 030 NM ELSEWHERE OVER WATER RADIUS OF 035 KT WINDS - 110 NM NORTHEAST SEMICIRCLE OVER WATER 090 NM ELSEWHERE OVER WATER REPEAT POSIT: 24.9S5 115.0E7 --- FORECASTS: 12 HRS, VALID AT: 230000Z5 --- 28.1S1 117.3E2 MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND VECTOR TO 24 HR POSIT: 140 DEG/ 20 KTS --- 24 HRS, VALID AT: 231200Z8 --- 31.3S7 120.2E5 MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND --- REMARKS: 221500Z0 POSITION NEAR 25.7S4 115.6E3. TROPICAL CYCLONE 30S (VANCE) HAS TRACKED SOUTH-SOUTHEASTWARD AT 20 KNOTS FOR THE PAST SIX HOURS. SATELLITE CURRENT INTENSITY ESTIMATES INDICATE THE SYSTEM HAS DECREASED INTENSITY TO NEAR T4.0 (65 KNOTS). TC 30S (VANCE) IS FORECAST TO CONTINUE RAPIDLY DISSIPATING DUE TO INTERACTION WITH LAND AND THE ENTRAINMENT OF DRY AIR. THE SYSTEM IS FORECAST TO CONTINUE ACCELERATING SOUTH-SOUTHEASTWARD AS THE SYSTEM WEAKENS, DISSIPATING OVER LAND BY THE 24 FORECAST PERIOD. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 221200Z7 IS 15 FEET. NEXT WARNINGS AT 230300Z8 (DTG 230157Z8).// ========================================================================= WTXS34 PGTW 990323 03:00z SUBJ: TROPICAL CYCLONE WARNING 1. TROPICAL CYCLONE 30S (VANCE) WARNING NR 017 01 ACTIVE TROPICAL CYCLONE IN SOUTHERN HEMISPHERE MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 230000Z5 --- NEAR 27.6S5 118.7E7 MOVEMENT PAST SIX HOURS - 120 DEGREES AT 23 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND RADIUS OF 035 KT WINDS - 070 NM SOUTHEAST SEMICIRCLE OVER WATER 060 NM ELSEWHERE OVER WATER REPEAT POSIT: NEAR 27.6S5 118.7E7 --- FORECASTS: 12 HRS, VALID AT: 231200Z8 --- 30.3S6 122.6E1 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND --- REMARKS: 230300Z8 POSITION NEAR 28.3S3 119.7E8. TROPICAL CYCLONE 30S (VANCE) HAS TRACKED EAST-SOUTHEASTWARD AT 23 KNOTS FOR THE PAST SIX HOURS OVER WESTERN AUSTRALIA. THE FORECAST POSITION AND INTENSITY ARE BASED UPON 222330Z2 ANIMATED VISIBLE SATELLITE IMAGERY WITH CURRENT INTENSITY ESTIMATES OF 30 AND 55 KNOTS. TROPICAL CYCLONE 30S IS FORECAST TO CONTINUE TO TRACK EAST-SOUTHEASTWARD AS IT DISSIPATES OVER LAND. THIS IS THE FINAL WARNING ON THIS SYSTEM BY THE JOINT TYPHOON WARNING CENTER (NAVPACMETOCCEN PH). THE SYSTEM WILL BE CLOSELY MONITORED FOR SIGNS OF REGENERATION.//
Tropical cyclone tracks developed by Michael Bath using operational warnings and advisories.
Document: tropical_cyclone_vance_jtwc_advisories.htm
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