WTPN32 PGTW 231500
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL STORM 21W (DIANMU) WARNING NR 005//
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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