Subject: Indian-S: 01 Active Tropical Cyclone In Southern Hemisphere

From: SIU Weather Processor <[email-masked]>
Date: Thu, 22 Apr 1999 21:42:31 -0500

999
WTXS31 PGTW 230300
1. TROPICAL CYCLONE 33S (HAMISH) WARNING NR 008
   01 ACTIVE TROPICAL CYCLONE IN SOUTHERN HEMISPHERE
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
    ---
   WARNING POSITION:
   230000Z5 --- NEAR 17.1S9 85.7E0
     MOVEMENT PAST SIX HOURS - 270 DEGREES AT 09 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
   RADIUS OF 035 KT WINDS - 180 NM SOUTH SEMICIRCLE
                            060 NM ELSEWHERE
   REPEAT POSIT: 17.1S9 85.7E0
    ---
   FORECASTS:
   12 HRS, VALID AT:
   231200Z8 --- 17.2S0 84.0E2
   MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   VECTOR TO 24 HR POSIT: 265 DEG/ 09 KTS
    ---
   24 HRS, VALID AT:
   240000Z6 --- 17.4S2 82.2E2
   MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   VECTOR TO 36 HR POSIT: 260 DEG/ 11 KTS
    ---
   36 HRS, VALID AT:
   241200Z9 --- 17.7S5 79.9E5
   MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
   DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
    ---
REMARKS:
230300Z8 POSITION NEAR 17.1S9   85.3E6.
TROPICAL CYCLONE (TC) 33S (HAMISH) HAS TRACKED WESTWARD AT 09 KNOTS
DURING THE PAST 6 HOURS. THE WARNING POSITION IS BASED ON 222330Z2
INFRARED SATELLITE IMAGERY ANALYSIS. THE WARNING INTENSITY IS BASED
ON A SATELLITE CURRENT INTENSITY ESTIMATE OF 30 KNOTS AND THE TIGHT
BANDING OF LOW-LEVEL CUMULUS CLOUD LINES. TC 33S (HAMISH) REMAINS
FULLY EXPOSED, THEREFORE, LOWERING THE STEERING LEVEL. THE LOW-LEVEL
SUBTROPICAL RIDGE TO THE SOUTH IS STEERING THE SYSTEM MORE WESTWARD
OVER THE PAST 18 HOURS. THIS WESTWARD FLOW IS FORECAST TO CONTINUE
TO STEER THE SYSTEMS LOW-LEVEL CIRCULATION CENTER (LLCC) AS THE
CONVECTION REMAINS SHEARED TO THE EAST. TC 33S (HAMISH) IS FORECAST
TO GRADUALLY WEAKEN AND DISSIPATE BY THE 36 HOUR POSITION DUE TO
CONTINUED MODERATE TO STRONG VERTICAL WINDSHEAR. THE WIND
RADII REFLECTS A PREVIOUS SCATTEROMETER IMAGE AND AN ENHANCED
PRESSURE GRADIENT SOUTH OF THE SYSTEM. MAXIMUM SIGNIFICANT WAVE
HEIGHT AT 230000Z5 IS 15 FEET. NEXT WARNINGS AT 231500Z1 (DTG
231351Z5) AND 240300Z9 (DTG 240151Z3).//
BT
#0001

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