HAZARDOUS WEATHER OUTLOOK
Issue Date: 348 AM EST THU DEC 17 2009
Expiration: 700 PM EST THU DEC 17 2009
...STRONG THUNDERSTORMS POSSIBLE STARTING LATE TONIGHT...
...WITH ONE OR TWO SEVERE STORMS POSSIBLE...
...LOCALLY HEAVY RAINFALL POSSIBLE MAINLY ON FRIDAY...
THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH FLORIDA.
.DAY ONE...TODAY AND TONIGHT
THUNDERSTORMS: A WEAK FRONTAL BOUNDARY ACROSS SOUTHERN FLORIDA IS
FORECAST TO START LIFTING BACK UP NORTH AS A WARM FRONT LATE TODAY
OR TONIGHT AS A LOW PRESSURE SYSTEM DEVELOPS ACROSS THE GULF OF
MEXICO. AS THE LOW PRESSURE SYSTEM DEVELOPS TODAY AND MOVE ACROSS
THE NORTHERN GULF OF MEXICO TONIGHT MOISTURE WILL INCREASE ALONG
WITH THE CHANCES OF SHOWERS AND THUNDERSTORMS TODAY AND TONIGHT. AS
THIS CHAIN OF EVENTS PROGRESS THERE WILL BE AN INCREASING CONCERN
FOR A FEW STRONG STORMS AFFECTING PORTIONS OF SOUTHERN FLORIDA
STARTING MAINLY AFTER MIDNIGHT TONIGHT.
WIND: THERE IS A CONCERN FOR A FEW STORMS WITH WIND GUSTS OF 40
MPH OR GREATER MAINLY AFTER MIDNIGHT TONIGHT ACROSS THE ATLANTIC
WATERS AND MAINLAND SOUTH FLORIDA MAINLY SOUTH OF ALLIGATOR ALLEY.
THIS THREAT WILL BE GREATEST ACROSS THE SOUTHWEST FLORIDA COASTAL
WATERS AS CLUSTERS OF THUNDERSTORMS ASSOCIATED WITH THE LOW
PRESSURE SYSTEM ACROSS THE GULF OF MEXICO MAY APPROACH SOUTHEAST
PORTIONS OF THE GULF BY THEN.
TORNADOES: THERE IS ALSO A CONCERN FOR A REMOTE CHANCE OF MAINLY
WATERSPOUTS/TORNADOES TODAY ACROSS THE ATLANTIC WATERS AND
ADJACENT COASTAL SECTIONS OF SOUTHEAST FLORIDA AS A WEAK BOUNDARY
REMAINS IN PLACE ACROSS THE AREA IN THE LOW LEVEL EASTERLY FLOW.
THEN AS WE MOVE INTO TONIGHT, THE POSSIBILITY OF TORNADOES WILL
SPREAD ALSO ACROSS THE SOUTHWEST FLORIDA COASTAL WATERS AND
ADJACENT COASTAL SECTIONS OF COLLIER AND MAINLAND MONROE COUNTIES
AS WELL AS MAINLAND SECTIONS OF SOUTHERN FLORIDA ALONG AND SOUTH
OF ALLIGATOR ALLEY.
.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY
THE LOW PRESSURE SYSTEM IS FORECAST TO MOVE ACROSS NORTHERN
FLORIDA AND SOUTHERN GEORGIA ON FRIDAY WITH A TRAILING COLD FRONT
MOVING ACROSS SOUTHWEST FLORIDA AROUND MIDNIGHT FRIDAY NIGHT AND
ACROSS SOUTHEASTERN FLORIDA DURING THE EARLY MORNING HOURS ON
SATURDAY. AHEAD OF THE FRONT THERE IS A CONCERN AT THE PRESENT
TIME FOR SOME STRONG THUNDERSTORMS WITH ONE OR TWO POSSIBLY
SEVERE. THE MAIN CONCERN WILL BE STRONG WIND GUSTS OF 40 MPH OR
GREATER...LOCALLY HEAVY RAINFALL...AND A POSSIBILITY OF
TORNADOES. THE THUNDERSTORMS ARE EXPECTED TO END WITH THE PASSAGE
OF THE COLD FRONT LATE FRIDAY NIGHT INTO EARLY SATURDAY MORNING.
NO OTHER HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE NEEDED BY SOMETIME FRIDAY MORNING DEPENDING
IF THE CONCERN FOR SEVERE WEATHER BEGINS TO MATERIALIZE. FOR MORE
INFORMATION...VISIT THE NATIONAL WEATHER SERVICE IN MIAMI WEBSITE
AT WWW.WEATHER.GOV/MIAMI.
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