Subject: Indian-S: 02 Active Tropical Cyclones In Southern Hemisphere

From: SIU Weather Processor <[email-masked]>
Date: Sat, 27 Dec 1997 20:55:48 -0600

939
WTXS32 PGTW 280300
1. TROPICAL CYCLONE 09S (SELWYN) WARNING NR 003
   02 ACTIVE TROPICAL CYCLONES IN SOUTHERN HEMISPHERE
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
    ---
   WARNING POSITION:
   280000Z0 --- 15.5S1 109.0E0
     MOVEMENT PAST SIX HOURS - 245 DEGREES AT 05 KTS
     POSITION ACCURATE TO WITHIN 060 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT
   RADIUS OF 050 KT WINDS - 020 NM
   RADIUS OF 035 KT WINDS - 050 NM SOUTHEAST SEMICIRCLE
                            045 NM ELSEWHERE
   REPEAT POSIT: 15.5S1 109.0E0
    ---
   FORECASTS:
   12 HRS, VALID AT:
   281200Z3 --- 16.0S7 108.1E0
   MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT
   RADIUS OF 035 KT WINDS - 040 NM SOUTHEAST SEMICIRCLE
                            035 NM ELSEWHERE
   VECTOR TO 24 HR POSIT: 240 DEG/ 05 KTS
    ---
   24 HRS, VALID AT:
   290000Z1 --- 16.5S2 107.2E0
   MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
   RADIUS OF 035 KT WINDS - 040 NM SOUTHEAST SEMICIRCLE
                            035 NM ELSEWHERE
   VECTOR TO 36 HR POSIT: 240 DEG/ 06 KTS
    ---
   36 HRS, VALID AT:
   291200Z4 --- 17.1S9 106.2E9
   MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER
WATER
   RADIUS OF 035 KT WINDS - 035 NM SOUTHEAST SEMICIRCLE
                            025 NM ELSEWHERE
   VECTOR TO 48 HR POSIT: 225 DEG/ 06 KTS
    ---
   EXTENDED OUTLOOK:
   48 HRS, VALID AT:
   300000Z3 --- 17.9S7 105.3E9
   MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER
WATER
    ---
REMARKS:
280300Z3 POSITION 15.6S2  108.8E7
TROPICAL CYCLONE 09S (SELWYN) IS MOVING WEST-
NORTHWESTWARD AT 5 KNOTS. WATER VAPOR IMAGERY INDICATES
THAT THE SYSTEM IS EXPERIENCING SIGNIFICANT COLD DRY AIR
ENTRAINMENT WHICH IS HINDERING CURRENT DEVELOPMENT.
DEPARTING FROM THE INTENSITY FORECAST ISSUED IN OUR LAST
WARNING, TC 09S (SELWYN) IS EXPECTED TO CONTINUE SLOWLY
WEST-NORTHWESTWARD AND WEAKEN DUE TO THE ENTRAINMENT AND
UPPER-LEVEL VERTICAL WIND SHEAR. MAXIMUM SIGNIFICANT WAVE
HEIGHT AT 280000Z IS 15 FEET. NEXT WARNINGS AT 281500Z6
(DTG 281353Z2) AND 290300Z4 (DTG 290153Z0). REFER TO
TROPICAL CYCLONE 08S (SID) WARNINGS (WTPS31 PGTW) FOR
TWELVE-HOURLY UPDATES.//

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