Bushman's Typhoon Blog: Typhoon CHOI-WAN (15W)

Sunday, September 20, 2009

Typhoon CHOI-WAN (15W) - Final Update

for Sunday, 20 September 2009 [12:28 PM PST]

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Typhoon2000 (T2K) NEWS (Sun September 20 2009):

Ending the 6-hrly advisories (except 12:00 AM) on TS CHOI-WAN (15W)...as it becomes Extratropical.

CHOI-WAN (15W) MAX WIND SPEED PER AGENCY:

+ Taiwan (CWB/10-min avg): 120 km/hr
+ Japan (JMA/10-min avg): 120 km/hr
+ Korea (KMA/10-min avg): 120 km/hr
+ Beijing (NMC/2-min avg): 120 km/hr
+ USA (JTWC/1-min avg): 110 km/hr

TROPICAL STORM CHOI-WAN [15W/0914]
T2K E-MAIL ADVISORY NUMBER 023 [FINAL]
12:00 PM PST (04:00 GMT) Sun 20 September 2009
Source: T2K ANALYSIS / JTWC WARNING #033 (FINAL)
View: Advisory Archives (2004-2009)

CHOI-WAN (15W) losing tropical characteristics...downgraded to a Tropical Storm...expected to become Extratropical tonight.

*This is the Final Advisory on this tropical cyclone.

*Kindly refer to your local warnings & bulletins issued by your country's official weather agency. This advisory is intended for additional information purposes only.

+ Forecast Outlook: N/A.

+ Effects: N/A.

[Important Note: Please keep in mind that the above forecast outlook, effects, current monsoon intensity, & tropical cyclone watch changes every 6 to 12 hrs!]
Time/Date: 12:00 PM PST Sun September 20 2009
Location of Eye: 34.6º N Lat 148.0º E Lon
Distance 1: 765 km (413 nm) ESE of Tokyo, Japan
Distance 2: 1,180 km (638 nm) South of Kuril Islands
MaxWinds (1-min avg): 110 kph (60 kts) near the center
Peak Wind Gusts: 140 kph (75 kts)
Saffir-Simpson Scale: Tropical Storm
Coastal Storm Surge Height: 1-3 feet [0.3-0.9 m]
Central Pressure: 978 millibars (hPa)
Recent Movement: NE @ 39 kph (21 kts)
General Direction: NW Pacific Ocean
Size (in Diameter): 945 km (510 nm) / Very Large
Max Sea Wave Height (near center): 30 ft (9.1 m)
Wunder TrackMap (for Public): 8 AM PST Sun Sep 20
JTWC Ship Avoidance TrackMap: 00Z Sun Sep 20
Multi-Agency Forecast TrackMap: 8 AM Sun Sep 20
TSR Wind Probabilities: Current to 1-day Ahead
Zoomed Satellite Pic: Near Real-Time
Wunderground Animation: 6-12 hr. GIF Loop

JTWC 12 HR. FORECAST & REMARKS:

8 PM (12 GMT) 20 SEPTEMBER: 37.6N 152.7E / 85-100 KPH (Tropical Storm) / --- @ -- KPH

REMARKS: 8 AM (00 GMT) 20 SEPTEMBER POSITION: 33.9N 146.8E.
^TS 15W HAS ACCELERATED TO THE NORTHEAST UNDER THE COM-
BINED STEERING INFLUENCE OF THE NORTHWESTERN PERIPHERY OF THE SUB-
TROPICAL RIDGE AND AN APPROACHING MID-LATITUDE TROUGH. RECENT ANI-
MATED MULTISPECTRAL IMAGERY DEPICTS A DETERIORATING TROPICAL STORM
WITH THE DEEP CONVECTION RAPIDLY ERODING ON THE SOUTHERN HALF OF THE
SYSTEM. THE CONVECTION IS BEING ADVERSELY AFFECTED BY DRY MID-
LATITUDE AIR WRAPPING INTO THE LOW LEVEL CIRCULATION CENTER (LLCC)
AND FULLY EXPOSING THE LLCC. ALSO, THE SYSTEM IS EXHIBITING STRONG
BAROCLINIC CHARACTERISTICS SUCH AS WARM FRONTOGENESIS TO THE NORTH-
EAST OF THE LLCC AND COLD FRONTOGENESIS TO THE SOUTHEAST. AN
INCREASINGLY UNFAVORABLE ENVIRONMENT WITH INCREASING VERTICAL WIND
SHEAR ASSOCIATED WITH THE JET STREAM ALOFT, DECREASING SEA SURFACE
TEMP-ERATURES AND COLD AIR ADVECTION ASSOCIATED WITH THE MID-
LATITUDE TROUGH HAVE BEEN THE MAJOR FACTORS IN THE RAPID DECLINE IN
BOTH THE SYSTEM STRUCTURE AND INTENSITY. 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...(more)

>> CHOI-WAN, meaning: Colorful Cloud. Name contributed by: Hong Kong, China.
__________________________________________________________________________________________________________________________________________________________

RECENT WUNDERGROUND.COM TRACKING CHART:

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RECENT MTSAT-1R SATELLITE IMAGE:

> Image source: NOAA SATELLITE CENTER

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RECENT WUNDERGROUND SATELLITE ANIMATION:

> Image source: Wunderground.com (http://www.wunderground.com/)

____________________________________________________________________________________________________________________

NOTE:

^ - JTWC commentary remarks (for Meteorologists) from their latest warning.

__________________________________________________________________________________________

>> To know the meteorological terminologies and acronyms used on this update visit the ff:

    http://typhoon2000.ph/tcterm.htm
    http://www.nhc.noaa.gov/aboutgloss.shtml
    http://www.srh.noaa.gov/oun/severewx/glossary.php
    http://www.srh.weather.gov/fwd/glossarynation.html
    http://www.nhc.noaa.gov/acronyms.shtml
__________________________________________________________________________________________

For the complete details on TS CHOI-WAN (15W)...go visit our website @:

> http://www.typhoon2000.com
> http://www.maybagyo.com

> http://www.typhoon2000.ph

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