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000 

WWUS20 KWNS 182350

SEL8

SPC WW 182350

ALZ000-FLZ000-CWZ000-190500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 208

NWS STORM PREDICTION CENTER NORMAN OK

640 PM CDT FRI APR 18 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST ALABAMA

       FAR WESTERN PARTS OF THE FLORIDA PANHANDLE

       COASTAL WATERS



EFFECTIVE THIS FRIDAY NIGHT FROM 640 PM UNTIL MIDNIGHT CDT.



TORNADOES...HAIL TO 1 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 50 STATUTE

MILES EAST AND WEST OF A LINE FROM 45 MILES NORTHWEST OF

EVERGREEN ALABAMA TO 35 MILES SOUTH OF MOBILE ALABAMA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU8).



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 207...



DISCUSSION...SCTD SEMI-DISCRETE SUPERCELLS MAY CONTINUE TO FORM

AHEAD OF SRN MS/SE LA COLD FRONT THROUGH THIS EVENING AS THE FRONT

CONTINUES E INTO AL.  TEMPORAL VEERING OF FLOW WILL OCCUR AT ALL

LEVELS OVER SW AL AS NEGATIVELY-TILTED LWR MS VLY UPR TROUGH

CONTINUES NEWD.  THIS SHOULD SUPPORT INCREASED LOW-LEVEL MOISTURE

ADVECTION INTO WW AREA AT THE SAME TIME THAT DEEP DIRECTIONAL SHEAR

STRENGTHENS.  OVERALL RESULT MAY BE AN EXTENTION OF CURRENT

SVR/ISOLD TORNADO THREAT IN SE MS/SE LA EWD INTO SW AL...BEFORE

DIURNAL COOLING/NVA ULTIMATELY SUPPRESS STORM DEVELOPMENT LATER

TONIGHT.



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

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.

MEAN STORM MOTION VECTOR 26035.





...CORFIDI

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