WDPN31 PGTW 091500
MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC//
SUBJ/PROGNOSTIC REASONING FOR TROPICAL STORM 13W (DUJUAN)/
WARNING NR 25//
RMKS/
1. FOR METEOROLOGISTS.
2. 12 HOUR SUMMARY AND ANALYSIS.
    A. TROPICAL STORM (TS) 13W (DUJUAN) HAS MAINTAINED ITS INTENSITY 
OVER THE PAST 12 HOURS AS IT UNDERGOES EXTRATROPICAL TRANSITION. THE 
SYSTEM IS TRACKING TO THE NORTHEAST TO EAST-NORTHEAST IN EXCESS OF 
30 KNOTS. DESPITE THE RAPID FORWARD MOTION THE SYSTEM CURRENTLY 
REMAINS WARM CORE IN NATURE, ALTHOUGH THE INTENSITY OF THE WARM 
ANOMALY ALOFT HAS WEAKENED OVER THE PAST 18 HOURS, AND HAS LOWERED 
IN THE ATMOSPHERIC COLUMN DURING THAT TIME. THE SYSTEM IS CURRENTLY 
TRACKING OVER COOLER WATERS (APPROXIMATELY 24 C) AS IT TRANSITIONS 
TO AN EXTRATROPICAL CYCLONE. A 090724Z AMSU IMAGE SHOWS THAT SOME 
DEEP CONVECTION REMAINS NEAR THE CENTER, WITH THE DEEPEST CONVECTION 
DISPLACED TO THE NORTHWEST OF THE SYTEM. THE SYSTEM HAS BECOME 
ELONGATED AND HAS DEVELOPED FRONTAL CHARACTERISTICS OVER THE PAST 12 
HOURS. 
3. FORECAST REASONING.
    A. THE FORECAST TRACK PHILOSOPHY HAS NOT CHANGED SINCE THE 
PREVIOUS PROGNOSTIC REASONING BULLETIN.
    B. TS DUJUAN WILL CONTINUE TO ACCELERATE NORTHEASTWARD ALONG THE 
NORTHERN PERIPHERY OF THE SUBTROPICAL RIDGE AND CONTINUE TO UNDERGO 
EXTRATROPICAL TRANSITION (ET). ET SHOULD BE COMPLETE BY TAU 12. THE 
SYSTEM IS EXPECTED TO MAINTAIN INTENSITY AS AN EXTRATROPICAL 
CYCLONE.//
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