WTPS31 PGTW 111500
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE 28P (TWENTYEIGHT) WARNING NR 004//
RMKS/
1. TROPICAL CYCLONE 28P (TWENTYEIGHT) WARNING NR 004    
   01 ACTIVE TROPICAL CYCLONE IN SOUTHPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
   WIND RADII VALID OVER OPEN WATER ONLY
    ---
   WARNING POSITION:
   111200Z --- NEAR 27.5S 170.7E
     MOVEMENT PAST SIX HOURS - 135 DEGREES AT 19 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
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT
                            055 NM SOUTHEAST QUADRANT
                            040 NM SOUTHWEST QUADRANT
                            040 NM NORTHWEST QUADRANT
   REPEAT POSIT: 27.5S 170.7E
    ---
   FORECASTS:
   12 HRS, VALID AT:
   120000Z --- 29.9S 172.9E
   MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
    ---
REMARKS:
111500Z POSITION NEAR 28.1S 171.2E.
11APR21. TROPICAL CYCLONE 28P (TWENTYEIGHT), LOCATED APPROXIMATELY 
409 NM SOUTHEAST OF NOUMEA, NEW CALEDONIA, HAS TRACKED SOUTHEASTWARD 
AT 19 KNOTS OVER THE PAST SIX HOURS. ANIMATED ENHANCED INFRARED 
(EIR) SATELLITE IMAGERY INDICATES THAT TC 28P HAS SIGNIFICANTLY 
WEAKENED, WITH THE LOWER LEVELS DECOUPLING AND LAGGING BEHIND THE 
UPPER-LEVEL CLOUD FEATURES. AN EXTRAPOLATION OF A PARTIAL 111013Z 
ASCAT-B PASS LENT HIGH CONFIDENCE IN THE INITIAL POSITION. THE SAME 
ASCAT PASS SHOWED A SMALL AREA OF 35-40KT WINDS CONFINED TO THE 
WESTERN PERIPHERY OF THE QUICKLY WEAKENING CIRCULATION. IN 
CONJUNCTION WITH A PGTW DVORAK INTENSITY ESTIMATE OF T2.0 (30 KTS) 
AND AN ADT ESTIMATE OF T2.8 (41 KTS), CONFIDENCE IS HIGH IN THE 
INITIAL INTENSITY. TC 28P IS MOVING SOUTHEASTWARD ALONG THE 
PERIPHERY OF A DEEP-LAYER STR TO THE EAST, BUT FORWARD SPEED HAS 
SLOWED AS IT DECOUPLES FROM THE UPPER-LEVEL FLOW. AS THE SYSTEM 
MOVES FURTHER SOUTHEASTWARD, VWS WILL INCREASE TO OVER 35 KNOTS AND 
SSTS WILL COOL TO LESS THAN 25C, LEADING TO RAPID DISSIPATION BELOW 
WARNING CRITERIA BY TAU 12. THIS IS THE FINAL WARNING ON THIS SYSTEM 
BY THE JOINT TYPHOON WRNCEN PEARL HARBOR HI. THE SYSTEM WILL BE 
CLOSELY MONITORED FOR SIGNS OF REGENERATION. MAXIMUM SIGNIFICANT 
WAVE HEIGHT AT 111200Z IS 15 FEET.//
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