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000 

WWUS20 KWNS 100056

SEL0

SPC WW 100056

NCZ000-SCZ000-TNZ000-100500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 290

NWS STORM PREDICTION CENTER NORMAN OK

855 PM EDT FRI MAY 9 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN NORTH CAROLINA

       FAR NORTHWESTERN SOUTH CAROLINA

       EASTERN TENNESSEE



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 855 PM

UNTIL 100 AM 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 5 MILES SOUTH OF

CROSSVILLE TENNESSEE TO 15 MILES NORTHEAST OF CHARLOTTE NORTH

CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 287...WW 288...WW 289...



DISCUSSION...ASCENT FROM SHORTWAVE TROUGH MOVING ACROSS THE

APPALACHIANS AND SURFACE HEATING HAS SUPPORTING INCREASE IN

THUNDERSTORMS OVER ERN TN THIS EVENING.  AREA REMAINS UNDER FAIRLY

STRONG WNWLY FLOW ALOFT AND RELATIVELY COLD MID LEVEL AIR MASS.

THIS SHOULD SUSTAIN A FEW ORGANIZED STORMS...INCLUDING

SUPERCELLS...EWD ACROSS WW THROUGH THE REST OF THE EVENING.  LARGE

HAIL WILL BE PRIMARY SEVERE THREAT...ALTHOUGH ISOLATED DAMAGING

WINDS ARE ALSO LIKELY WITH THE STRONGER CORES.



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 28035.





...EVANS

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