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000 

WWUS20 KWNS 211942

SEL8

SPC WW 211942

NCZ000-TNZ000-220100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 718

NWS STORM PREDICTION CENTER NORMAN OK

345 PM EDT MON JUL 21 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF WESTERN NORTH CAROLINA

       PARTS OF MIDDLE AND ALL OF EASTERN TENNESSEE



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 345 PM UNTIL 900

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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST OF

CROSSVILLE TENNESSEE TO 45 MILES NORTHEAST OF ASHEVILLE NORTH

CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 716...WW 717...



DISCUSSION...SEVERE THUNDERSTORMS OVER CENTRAL KY HAVE DEVELOP A

COLD POOL AND ARE PROPAGATING SSEWD INTO A VERY UNSTABLE AIR MASS.

DAMAGING WINDS WILL ACCOMPANY THESE STORMS AS THEY CONTINUE S/SE

ACROSS THE WATCH AREA.



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 33025.





...HALES

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