Subject: Pacific-NW: 1. Tropical Depression 17w (seventeen) Warning Nr 008

From: SIU Weather Processor <[email-masked]>
Date: Sat, 23 Oct 2010 08:43:10 -0500

WTPN33 PGTW 231500
MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC//
SUBJ/TROPICAL CYCLONE WARNING//
RMKS/
1. TROPICAL DEPRESSION 17W (SEVENTEEN) WARNING NR 008
   03 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
   WIND RADII VALID OVER OPEN WATER ONLY
    ---
   WARNING POSITION:
   231200Z --- NEAR 22.8N 154.9E
     MOVEMENT PAST SIX HOURS - 055 DEGREES AT 10 KTS
     POSITION ACCURATE TO WITHIN 060 NM
     POSITION BASED ON CENTER LOCATED BY A COMBINATION OF
     SATELLITE AND EXTRAPOLATION
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   REPEAT POSIT: 22.8N 154.9E
    ---
   FORECASTS:
   12 HRS, VALID AT:
   240000Z --- 24.3N 156.7E
   MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   VECTOR TO 24 HR POSIT: 035 DEG/ 13 KTS
    ---
   24 HRS, VALID AT:
   241200Z --- 26.4N 158.4E
   MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
    ---
REMARKS:
231500Z POSITION NEAR 23.2N 155.4E.
TROPICAL DEPRESSION (TD) 17W (SEVENTEEN), LOCATED APPROXIMATELY
745 NM EAST-SOUTHEAST OF IWO TO, JAPAN, HAS TRACKED NORTHEASTWARD
AT 10 KNOTS OVER THE PAST SIX HOURS. ANIMATED INFRARED SATELLITE
IMAGERY SHOWS THE CONVECTION ASSOCIATED WITH THE SYSTEM HAS WEAKENED
AS THE EXPOSED LOW LEVEL CIRCULATION CENTER (LLCC) ACCELERATED AND
FURTHER OPENED DISTANCE FROM THE MAIN CONVECTION. UPPER LEVEL
ANALYSIS INDICATES THE SYSTEM IS JUST SOUTH OF A DEEP-LAYERED
SUBTROPICAL RIDGE TO THE NORTH THAT IS CAUSING MODERATE EASTERLY
VERTICAL WIND SHEAR OVER THE SYSTEM. IN CONTRAST, THE LLCC IS BEING
STEERED NORTHEASTWARD BY A LOW LEVEL RIDGE TO THE SOUTHEAST. DUE TO
THE CONVECTION BEING DECOUPLED FROM THE LLCC, TD 17W IS EXPECTED TO
DISSIPATE AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER WITHIN THE
NEXT 12 HOURS. THIS IS THE FINAL WARNING ON THIS SYSTEM BY THE JOINT
TYPHOON WARNING CENTER (NAVMARFCSTCEN).  THE SYSTEM WILL BE CLOSELY
MONITORED FOR SIGNS OF REGENERATION. MAXIMUM SIGNIFICANT WAVE HEIGHT
AT 231200Z IS 12 FEET. REFER TO TROPICAL DEPRESSION 16W (SIXTEEN)
WARNINGS (WTPN32 PGTW) FOR SIX-HOURLY UPDATES.//

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