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000 

WWUS20 KWNS 221735

SEL5

SPC WW 221735

ALZ000-GAZ000-TNZ000-230000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 725

NWS STORM PREDICTION CENTER NORMAN OK

1235 PM CDT TUE JUL 22 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF NORTHERN ALABAMA

       PARTS OF NORTHWEST GEORGIA

       PARTS OF MIDDLE AND EASTERN TENNESSEE



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1235 PM UNTIL

700 PM CDT.



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 75

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES NORTHWEST

OF TUSCALOOSA ALABAMA TO 60 MILES EAST OF CROSSVILLE TENNESSEE.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU5).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 724...



DISCUSSION...OUTFLOW BOUNDARY FROM E OF BNA SWWD INTO NRN MS WILL

FOCUS STRONG/SEVERE THUNDERSTORMS AS IT MOVES SEWD INTO A VERY MOIST

AND UNSTABLE WARM SECTOR.  WHILE SHEAR IS GENERALLY LESS THAN 20KTS

COMBINATION OF COLD POOL DEVELOPMENT AND WET MICRO BURSTS SUPPORTS A

WIND DAMAGE THREAT AS STORMS INCREASE IN NUMBER AND INTENSITY ACROSS

THE WATCH NEXT SEVERAL HOURS.



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 550. MEAN STORM

MOTION VECTOR 27015.





...HALES

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