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WWUS20 KWNS 280647

SEL0

SPC WW 280647

FLZ000-CWZ000-281400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 70

NWS STORM PREDICTION CENTER NORMAN OK

245 AM EDT MON MAR 28 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST FLORIDA AND THE EASTERN FLORIDA PANHANDLE

       COASTAL WATERS



EFFECTIVE THIS MONDAY MORNING FROM 245 AM UNTIL 1000 AM EDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45

STATUTE MILES EITHER SIDE OF A LINE FROM 80 MILES WEST NORTHWEST

OF CROSS CITY FLORIDA TO 10 MILES EAST NORTHEAST OF GAINESVILLE

FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



DISCUSSION...NERN GULF OF MEXICO TSTMS THAT HAVE BEEN

MOVING/DEVELOPING ENE TOWARD THE FL CSTL BEND ARE IN AN ENVIRONMENT

CHARACTERIZED BY 50+ KT DEEP WLY SHEAR AND MODERATE SFC-BASED

INSTABILITY WITH NEAR 70F SFC DEWPOINTS.  ACTIVITY APPEARS TO MARK

LEADING EDGE OF MORE MOISTURE-RICH AIR SPREADING ENE FROM THE ERN

GULF.  THEY MAY POSE A THREAT FOR SVR HAIL...SMALL BOWING SEGMENTS

WITH DMGG WIND...AND PERHAPS A BRIEF TORNADO AS THEY MOVE/DEVELOP

INLAND THROUGH LATER THIS MORNING.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 25035.





...CORFIDI

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