

267 

WWUS20 KWNS 241757

SEL7

SPC WW 241757

KYZ000-TNZ000-VAZ000-WVZ000-250000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 357

NWS STORM PREDICTION CENTER NORMAN OK

200 PM EDT TUE MAY 24 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST KENTUCKY

       MIDDLE AND EASTERN TENNESSEE

       EXTREME SOUTHWEST VIRGINIA

       EXTREME SOUTHERN WEST VIRGINIA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 200 PM UNTIL

800 PM EDT.



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 30 MILES SOUTHWEST

OF NASHVILLE TENNESSEE TO 50 MILES NORTHEAST OF BRISTOL

TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 352...WW 354...WW

355...WW 356...



DISCUSSION...THUNDERSTORMS ARE RE-DEVELOPING OVER PORTIONS OF KY/TN

WHERE STRONG DAYTIME HEATING/DESTABILIZATION IS OCCURRING.

SUFFICIENT WESTERLY FLOW ALOFT AND STEEP LAPSE RATES WILL PROMOTE A

RISK OF HAIL AND DAMAGING WINDS IN THE STRONGER CELLS.



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 500. MEAN STORM

MOTION VECTOR 27030.





...HART

