Sunday, September 13, 2009

Bearing down

It is Monday morning. It's raining.
BULLETIN
TROPICAL STORM CHOI-WAN (15W) INTERMEDIATE ADVISORY NUMBER 7A
NATIONAL WEATHER SERVICE TIYAN GU WP152009
500 AM CHST MON SEP 14 2009

...TROPICAL STORM CHOI-WAN CURRENTLY DRIFTING SOUTHWESTWARD...

A TROPICAL STORM WARNING REMAINS IN EFFECT FOR TINIAN...SAIPAN AND AGRIHAN.

A TYPHOON WATCH REMAINS IN EFFECT FOR TINIAN...SAIPAN AND AGRIHAN.

A TROPICAL STORM WARNING IN CONJUNCTION WITH A TYPHOON WATCH MEANS TROPICAL STORM-FORCE WINDS ARE EXPECTED...AND TYPHOON-FORCE WINDS OF 74 MPH OR MORE ARE POSSIBLE WITHIN 24 HOURS.

AT 400 AM CHST...1800Z...TROPICAL STORM CHOI-WAN WAS CENTERED NEAR LATITUDE 15.6 DEGREES NORTH AND LONGITUDE 148.5 DEGREES EAST.

THIS IS ABOUT 290 MILES SOUTHEAST OF AGRIHAN
225 MILES SOUTHEAST OF ALAMAGAN
190 MILES EAST-NORTHEAST OF TINIAN AND SAIPAN
245 MILES NORTHEAST OF ROTA AND
290 MILES NORTHEAST OF GUAM.

TROPICAL STORM CHOI-WAN HAS SLOWED IN FORWARD SPEED DURING THE PAST FEW HOURS AND IS MOVING WEST-SOUTHWEST AT 4 MPH. A GRADUAL TURN TO THE WEST-NORTHWEST IS EXPECTED DURING THE NEXT 24 HOURS. CHOI-WAN IS EXPECTED TO PASS A LITTLE NORTH OF SAIPAN LATE MONDAY AFTERNOON.

MAXIMUM SUSTAINED WINDS ARE 70 MPH. TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 120 MILES FROM THE CENTER IN THE NORTHEAST SEMI-CIRCLE AND 60 MILES FROM THE CENTER IN THE SOUTHWEST SEMI-CIRCLE. CHOI-WAN IS EXPECTED TO INTENSIFY AND MAY BECOME A TYPHOON DURING THE NEXT 12 HOURS.

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