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WWUS20 KWNS 042029

SEL9

SPC WW 042029

KYZ000-TNZ000-VAZ000-050200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 659

NWS STORM PREDICTION CENTER NORMAN OK

430 PM EDT TUE AUG 4 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEASTERN KENTUCKY

       MIDDLE AND EASTERN TENNESSEE

       FAR WESTERN VIRGINIA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 430 PM UNTIL

1000 PM EDT.



HAIL TO 1.5 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES WEST

SOUTHWEST OF NASHVILLE TENNESSEE TO 35 MILES NORTHEAST OF BRISTOL

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 657...WW 658...



DISCUSSION...STRONG TO SEVERE THUNDERSTORMS ARE ALREADY BECOMING

WIDESPREAD ACROSS WW LATE THIS AFTERNOON AHEAD OF WEAKENING LINEAR

MCS MOVING OUT OF KY.  SHEAR REMAINS MODEST...BUT AIRMASS ACROSS

MIDDLE TN INTO NERN TN IS VERY UNSTABLE.  EXPECT ISOLATED DAMAGING

WINDS/HAIL WILL ACCOMPANY STRONGER STORMS AS STORMS INCREASE IN

COVERAGE THROUGH THE EARLY EVENING.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 33035.





...EVANS

