TROPICAL STORM BILL ADVISORY NUMBER 4
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL032009
500 AM AST SUN AUG 16 2009

...BILL STRENGTHENS A LITTLE...

AT 500 AM AST...0900 UTC...THE CENTER OF TROPICAL STORM BILL WAS
LOCATED NEAR LATITUDE 11.4 NORTH...LONGITUDE 37.2 WEST OR ABOUT 1640
MILES...2645 KM...EAST OF THE LESSER ANTILLES.

BILL IS MOVING TOWARD THE WEST NEAR 13 MPH...20 KM/HR. A GRADUAL
TURN TOWARD THE WEST-NORTHWEST WITH AN INCREASE IN FORWARD SPEED IS
EXPECTED DURING THE NEXT 24 TO 48 HOURS.

MAXIMUM SUSTAINED WINDS HAVE INCREASED TO NEAR 45 MPH...75
KM/HR...WITH HIGHER GUSTS. SOME STRENGTHENING IS FORECAST...AND
BILL IS EXPECTED TO BECOME A HURRICANE DURING THE NEXT FEW DAYS.

TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 70 MILES...110 KM
FROM THE CENTER.

ESTIMATED MINIMUM CENTRAL PRESSURE IS 1002 MB...29.59 INCHES.

...SUMMARY OF 500 AM AST INFORMATION...
LOCATION...11.4N 37.2W
MAXIMUM SUSTAINED WINDS...45 MPH
PRESENT MOVEMENT...WEST OR 270 DEGREES AT 13 MPH
MINIMUM CENTRAL PRESSURE...1002 MB

THE NEXT ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE CENTER AT
1100 AM AST.