

150 

WWUS20 KWNS 281824

SEL3

SPC WW 281824

KYZ000-NCZ000-OHZ000-TNZ000-VAZ000-WVZ000-290200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 313

NWS STORM PREDICTION CENTER NORMAN OK

220 PM EDT THU MAY 28 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN KENTUCKY

       FAR WESTERN NORTH CAROLINA

       EXTREME SOUTHERN OHIO

       EASTERN TENNESSEE

       WESTERN VIRGINIA

       SOUTHERN WEST VIRGINIA



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 220 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 85

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES EAST OF

CHATTANOOGA TENNESSEE TO 15 MILES NORTH NORTHEAST OF CHARLESTON

WEST VIRGINIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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.



DISCUSSION...DESTABILIZING AIR MASS COMBINED WITH INCREASING LARGE

SCALE LIFT... ASSOCIATED WITH MID LEVEL TROUGH MOVING INTO THE

WESTERN LOWER OH VALLEY...WILL RESULT IN THUNDERSTORMS TO INCREASE

IN NUMBER AND INTENSITY INTO THE EVENING HOURS. MODERATE INSTABILITY

AND INCREASING DEEP LAYER SHEAR WILL SUPPORT SEVERE MULTICELL STORMS

WITH HAIL AND WIND DAMAGE.



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 25025.





...IMY

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