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763 

WWUS20 KWNS 021835

SEL7

SPC WW 021835

ALZ000-FLZ000-MSZ000-TNZ000-CWZ000-030100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 107

NWS STORM PREDICTION CENTER NORMAN OK

135 PM CDT THU APR 2 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN AND CENTRAL ALABAMA

       THE WESTERN FLORIDA PANHANDLE

       SOUTHEAST MISSISSIPPI

       SOUTHERN MIDDLE TENNESSEE

       COASTAL WATERS



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 135 PM UNTIL

800 PM CDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

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

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 90 MILES NORTH OF HUNTSVILLE

ALABAMA TO 50 MILES SOUTHWEST OF PENSACOLA FLORIDA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU7).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 103...WW 104...WW

105...WW 106...



DISCUSSION...A PRE-FRONTAL BAND OF SEVERE STORMS IN MS WILL SPREAD

EWD/NEWD INTO AL/TN DURING THE NEXT FEW HOURS IN ASSOCIATION WITH A

LEAD SHORTWAVE TROUGH EJECTING AHEAD OF THE PRIMARY SYNOPTIC WAVE

NEAR TXK.  THOUGH THE ONGOING GULF COAST CONVECTION HAS DISRUPTED

MOIST INFLOW ACROSS AL AND WILL TEND TO LIMIT THE ERN EXTENT OF THE

SEVERE THREAT FOR THE NEXT FEW HOURS...BOUNDARY LAYER DEWPOINTS IN

THE 60S AND SOME HEATING IN CLOUD BREAKS WILL CONTRIBUTE TO

SUFFICIENT INSTABILITY TO MAINTAIN A SEVERE STORM THREAT A LITTLE

FARTHER W THROUGH THE AFTERNOON.  LOCAL VWP/S ALSO SHOW SUFFICIENT

VEERING AND SPEED INCREASES WITH HEIGHT TO SUPPORT SUPERCELLS AND AN

ATTENDANT THREAT FOR A FEW TORNADOES...LARGE HAIL...AND DAMAGING

WINDS THROUGH THE AFTERNOON.



AVIATION...TORNADOES AND 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.





...THOMPSON

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