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738 

WWUS20 KWNS 042255

SEL9

SPC WW 042255

KYZ000-TNZ000-050400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 549

NWS STORM PREDICTION CENTER NORMAN OK

555 PM CDT SAT JUL 4 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH CENTRAL KENTUCKY

       MIDDLE TENNESSEE



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 555 PM UNTIL

1100 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 45

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 70 MILES WEST OF

FORT CAMPBELL KENTUCKY TO 30 MILES EAST NORTHEAST OF NASHVILLE

TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 545...WW 546...WW

547...WW 548...



DISCUSSION...SEVERE THREAT WILL LIKELY SPREAD ESEWD ALONG SURFACE

FRONT WITH STRENGTHENING WLY LLJ FORECAST TO OVERSPREAD THE MID

SOUTH THIS EVENING.  DEEP LAYER SHEAR WILL BE MORE THAN ADEQUATE FOR

SUPERCELLS...ALONG WITH SMALL SCALE BOW ECHOES.  LARGE HAIL AND

DAMAGING WINDS WILL BE PRIMARY SEVERE THREATS...ALTHOUGH AN ISOLATED

TORNADO REMAINS POSSIBLE WHERE STORMS INTERACT WITH SURFACE

BOUNDARIES.



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 450. MEAN STORM

MOTION VECTOR 29035.





...EVANS

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