WTPN32 PGTW 231500
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE WARNING//
RMKS/
1. TROPICAL STORM 21W (DIANMU) WARNING NR 005    
   02 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
   WIND RADII VALID OVER OPEN WATER ONLY
    ---
   WARNING POSITION:
   231200Z --- NEAR 15.2N 108.9E
     MOVEMENT PAST SIX HOURS - 305 DEGREES AT 15 KTS
     POSITION ACCURATE TO WITHIN 030 NM
     POSITION BASED ON CENTER LOCATED BY A COMBINATION OF 
     SATELLITE AND RADAR
   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 LAND
   RADIUS OF 034 KT WINDS - 030 NM NORTHEAST QUADRANT
                            025 NM SOUTHEAST QUADRANT
                            000 NM SOUTHWEST QUADRANT
                            030 NM NORTHWEST QUADRANT
   REPEAT POSIT: 15.2N 108.9E
    ---
   FORECASTS:
   12 HRS, VALID AT:
   240000Z --- 16.1N 106.4E
   MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND
   VECTOR TO 24 HR POSIT: 275 DEG/ 12 KTS
    ---
   24 HRS, VALID AT:
   241200Z --- 16.2N 103.8E
   MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND
    ---
REMARKS:
231500Z POSITION NEAR 15.4N 108.3E.
23SEP21. TROPICAL STORM (TS) 21W (DIANMU), LOCATED APPROXIMATELY 
59 NM SOUTHEAST OF DA NANG, VIETNAM, HAS TRACKED NORTHWESTWARD 
AT 15 KNOTS OVER THE PAST SIX HOURS. ANIMATED ENHANCED INFRARED 
(EIR) SATELLITE IMAGERY SHOWS DEEP CONVECTION OBSCURING THE LOW 
LEVEL CIRCULATION CENTER (LLCC). THE POSITION IS BASED ON A 231109 
SSMIS MICROWAVE IMAGE SHOWING THE REMAINING CONVECTION PRIMARILY 
DISPLACED OVER VIETNAM. THE INITIAL POSITION IS PLACED WITH MODERATE 
CONFIDENCE BASED ON THE AFOREMENTIONED MICROWAVE IMAGERY. THE 
INITIAL INTENSITY IS HEDGED BETWEEN AGENCY DVORAK INTENSITY 
ESTIMATES OF T2.0/30 KNOTS AND AN AUTOMATED DVORAK INTENSITY 
ESTIMATE OF 43 KNOTS JUST BEFORE LANDFALL. INCREASING VERTICAL WIND 
SHEAR AND LAND INTERACTION WILL FURTHER DIMINISH THE INTENSITY OF TS 
21W. IT IS EXPECTED TO DISSIPATE BY TAU 24 AS IT MOVES OVER THE 
MOUNTAINOUS TERRAIN OF VIETNAM AND LAOS. 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.
REFER TO TROPICAL STORM 20W (MINDULLE) WARNINGS (WTPN31 PGTW)
FOR SIX-HOURLY UPDATES.//
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