WTPN32 PGTW 302100
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL DEPRESSION 21W (ETAU) WARNING NR 016//
RMKS/
1. TROPICAL DEPRESSION 21W (ETAU) WARNING NR 016
02 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
WIND RADII VALID OVER OPEN WATER ONLY
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WARNING POSITION:
301800Z --- NEAR 31.7N 166.8E
MOVEMENT PAST SIX HOURS - 050 DEGREES AT 09 KTS
POSITION ACCURATE TO WITHIN 060 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
WIND RADII VALID OVER OPEN WATER ONLY
BECOMING SUBTROPICAL
REPEAT POSIT: 31.7N 166.8E
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FORECASTS:
12 HRS, VALID AT:
310600Z --- 33.7N 167.6E
MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
WIND RADII VALID OVER OPEN WATER ONLY
SUBTROPICAL
VECTOR TO 24 HR POSIT: 005 DEG/ 13 KTS
---
24 HRS, VALID AT:
311800Z --- 36.3N 168.0E
MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
WIND RADII VALID OVER OPEN WATER ONLY
SUBTROPICAL
---
REMARKS:
302100Z POSITION NEAR 32.2N 167.0E.
30AUG26. TROPICAL DEPRESSION 21W (ETAU), LOCATED APPROXIMATELY
744 NM NORTH OF WAKE ISLAND, HAS TRACKED NORTHEASTWARD AT 09
KNOTS OVER THE PAST SIX HOURS. ANIMATED INFRARED IMAGERY REVEALS
TROPICAL DEPRESSION (TD) 21W IS A HIGHLY ELONGATED SYSTEM POSITIONED
DIRECTLY UNDER AN UPPER-LEVEL LOW. WITHIN THE LAST FEW HOURS, 21W
CROSSED THE 26C ISOTHERM AND BEGAN SUBTROPICAL TRANSITION.
ENVIRONMENTAL ANALYSIS REVEALS A HIGHLY UNFAVORABLE ENVIRONMENT,
CHARACTERIZED BY HIGH (30-35 KTS) VERTICAL WIND SHEAR, COOL (25-26 C)
SEA SURFACE TEMPERATURES, POOR OUTFLOW ALOFT, AND PERSISTENT DRY AIR ENTRAINMENT. 21W IS FORECAST TO CONTINUE TRACKING POLEWARD WHILE IT
QUICKLY COMPLETES SUBTROPICAL TRANSITION. ADDITIONALLY, DETERMINISTIC
MODEL GUIDANCE DEPICTS 21W DISSIPATING COMPLETELY WITHIN 12 HOURS.
INTENSITY AIDS ARE IN STRONG AGREEMENT THAT 21W WILL MAINTAIN ITS
INTENSITY FOR THE DURATION OF THE FORECAST PERIOD. SUBTROPICAL
TRANSITION IS FORECAST TO OCCUR WITHIN 12 HOURS. 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.
MINIMUM CENTRAL PRESSURE AT 301800Z IS 991 MB. MAXIMUM SIGNIFICANT
WAVE HEIGHT AT 301800Z IS 20 FEET. REFER TO TROPICAL STORM 20W
(BANG-LANG) FINAL WARNING (WTPN33 PGTW).//
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