Subject: Pacific-NW: 1. Extratropical Cyclone 16w (chaba) Warning Nr 036

From: SIU Weather Processor <[email-masked]>
Date: Sat, 30 Oct 2010 04:05:07 -0500

WTPN32 PGTW 300900
MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC//
SUBJ/EXTRATROPICAL CYCLONE WARNING//
RMKS/
1. EXTRATROPICAL CYCLONE 16W (CHABA) WARNING NR 036
   DOWNGRADED FROM TYPHOON 16W
   01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
   WIND RADII VALID OVER OPEN WATER ONLY
    ---
   WARNING POSITION:
   300600Z --- NEAR 33.6N 139.0E
     MOVEMENT PAST SIX HOURS - 045 DEGREES AT 22 KTS
     POSITION ACCURATE TO WITHIN 060 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   EXTRATROPICAL
   REPEAT POSIT: 33.6N 139.0E
    ---
   FORECASTS:
   12 HRS, VALID AT:
   301800Z --- 36.3N 143.0E
   MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   EXTRATROPICAL
   VECTOR TO 24 HR POSIT: 050 DEG/ 21 KTS
    ---
   24 HRS, VALID AT:
   310600Z --- 39.0N 147.1E
   MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   EXTRATROPICAL
    ---
REMARKS:
300900Z POSITION NEAR 34.3N 140.0E.
EXTRATROPICAL (XT) CYCLONE 16W (CHABA), LOCATED APPROXIMATELY 130 NM
SOUTH-SOUTHWEST OF TOKYO, JAPAN, HAS TRACKED NORTHEASTWARD AT 22
KNOTS DURING THE PAST SIX HOURS. THE CYCLONE HAS LOST ALL
IDENTIFIABLE TROPICAL CHARACTERISTICS AND IS NOW BEING CLASSIFIED AS
AN XT CYCLONE. FORMATIVE FRONTAL FEATURES HAVE BECOME MORE EVIDENT
IN ANIMATED MULTISPECTRAL SATELLITE IMAGERY OVER THE PAST FEW HOURS
AS THE SYSTEM EMBEDS WITHIN THE BAROCLINIC ZONE. EXCESSIVE VERTICAL
WIND SHEAR ASSOCIATED WITH THE POLAR JET HAS DEPLETED DEEP
CONVECTION IN ALL BUT THE NORTHEASTERN QUADRANT. HOWEVER, EVEN THIS
CONVECTION HAS WEAKENED CONSIDERABLY SINCE THE PREVIOUS FORECAST.
THE CYCLONE WILL CONTINUE TO WEAKEN AS IT ACCELERATES INTO THE MID-
LATITUDES. THE CURRENT POSITION IS BASED ON DVORAK AND RADAR FIXES
FROM PGTW AND RJTD. THE INITIAL FORECAST INTENSITY IS BASED ON AN XT
DATA-T NUMBER OF 3.5 FROM PGTW, AND A CORRESPONDING CURRENT
INTENSITY OF 4.0. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 300600Z IS 20
FEET. NEXT WARNINGS AT 301500Z, 302100Z AND 310300Z.//

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