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WWUS20 KWNS 081758

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ALZ000-FLZ000-GAZ000-CWZ000-082300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 65

NWS STORM PREDICTION CENTER NORMAN OK

200 PM EDT THU APR 8 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EXTREME SOUTHEAST ALABAMA

       THE FLORIDA PANHANDLE

       SOUTHWEST GEORGIA

       COASTAL WATERS



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 200 PM UNTIL

700 PM EDT.



TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHEAST OF ALBANY

GEORGIA TO 25 MILES SOUTH SOUTHWEST OF PANAMA CITY FLORIDA.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU5).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



DISCUSSION...DISCRETE WARM SECTOR STORM DEVELOPMENT SHOULD PERSIST

THROUGH THE AFTERNOON ALONG THE MOIST AXIS AND IN ADVANCE OF A

SURFACE COLD FRONT.  LOW-LEVEL AND DEEP-LAYER SHEAR ARE SUFFICIENT

FOR SUPERCELLS IN AN ENVIRONMENT OF WEAK-MODERATE INSTABILITY.

GIVEN EFFECTIVE SRH AROUND 150-200 M2/S2 AND BOUNDARY LAYER

DEWPOINTS IN THE MID-UPPER 60S...A COUPLE OF TORNADOES WILL BE

POSSIBLE.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

450. MEAN STORM MOTION VECTOR 25025.





...THOMPSON

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