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WWUS20 KWNS 041650

SEL4

SPC WW 041650

NCZ000-TNZ000-VAZ000-WVZ000-050000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 594

NWS STORM PREDICTION CENTER NORMAN OK

1250 PM EDT MON JUL 4 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN AND CENTRAL NORTH CAROLINA

       EAST TENNESSEE

       SOUTHWEST VIRGINIA

       EXTREME SOUTHERN WEST VIRGINIA



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 1250 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 70

STATUTE MILES EITHER SIDE OF A LINE FROM 5 MILES SOUTH OF

KNOXVILLE TENNESSEE TO 55 MILES EAST NORTHEAST OF DANVILLE

VIRGINIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 593...



DISCUSSION...THUNDERSTORMS ARE INCREASING IN COVERAGE OVER THE

MOUNTAINS OF TN/NC AND EXTREME SOUTHWEST VA.  THIS ACTIVITY IS

EXPECTED TO SPREAD EASTWARD ACROSS THE WATCH AREA THROUGH THE

AFTERNOON HOURS.  HIGH LOW LEVEL THETA-E AND CAPE VALUES COUPLED

WITH SUFFICIENT WESTERLY FLOW ALOFT WILL PROMOTE STRONG DOWNDRAFTS

IN THE STRONGER CELLS CAPABLE OF LOCALLY DAMAGING WINDS.



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 27025.





...HART

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