Subject: Indian-S: 1. Tropical Cyclone 20s (alistair) Warning Nr 014

From: SIU Weather Processor <[email-masked]>
Date: Fri, 20 Apr 2001 02:40:10 -0500

WTXS31 PGTW 200900
1. TROPICAL CYCLONE 20S (ALISTAIR) WARNING NR 014
   01 ACTIVE TROPICAL CYCLONE IN SOUTHERN HEMISPHERE
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
    ---
   WARNING POSITION:
   200600Z8 --- NEAR 18.4S3 114.8E4
     MOVEMENT PAST SIX HOURS - 255 DEGREES AT 16 KTS
     POSITION ACCURATE TO WITHIN 040 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   RADIUS OF 035 KT WINDS - 100 NM SOUTHEAST SEMICIRCLE
                            050 NM ELSEWHERE
   REPEAT POSIT: 18.4S3 114.8E4
    ---
   FORECASTS:
   12 HRS, VALID AT:
   201800Z1 --- 19.6S6 113.0E5
   MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   VECTOR TO 24 HR POSIT: 235 DEG/ 10 KTS
    ---
   24 HRS, VALID AT:
   210600Z9 --- 20.7S9 111.2E5
   MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   VECTOR TO 36 HR POSIT: 205 DEG/ 07 KTS
    ---
   36 HRS, VALID AT:
   211800Z2 --- 22.0S4 110.5E7
   MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT
   DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
    ---
REMARKS:
200900Z1 POSITION NEAR 18.7S6 114.3E9.
TROPICAL CYCLONE (TC) 20S (ALISTAIR), LOCATED APPROXIMATELY 235 NM
NORTH OF LEARMONTH, AUSTRALIA, HAS TRACKED WEST-SOUTHWESTWARD AT 16
KNOTS OVER THE PAST 6 HOURS. THE WARNING POSITION IS BASED ON
200530Z0 VISIBLE SATELLITE IMAGERY. THE WARNING INTENSITY IS BASED
ON CURRENT INTENSITY ESTIMATES OF 45 KNOTS. MULTI-SPECTRAL SATELLITE
IMAGERY DEPICTS A FULLY EXPOSED LOW-LEVEL CIRCULATION CENTER WITH
ASSOCIATED WEAKENING CONVECTION DECOUPLED ABOUT 36 NM TO THE SOUTH
THROUGH SOUTHEAST. TC 20S IS FORECAST TO TRACK INCREASINGLY
SOUTHWESTWARD OVER THE NEXT 24 HOURS. AFTERWARD, THE SYSTEM SHOULD
BEGIN TO TRACK MORE SOUTHWARD WITH A WEAKNESS IN THE LOW/MID LEVEL
RIDGE. TC 20S IS FORECAST TO DISSIPATE BY THE END OF THE PERIOD.
MAXIMUM SIGNIFICANT WAVE HEIGHT AT 200600Z8 IS 12 FEET. NEXT
WARNINGS AT 201500Z8, 202100Z5, 210300Z6 AND 210900Z2.//

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