

204 

WWUS20 KWNS 181506

SEL0

SPC WW 181506

GAZ000-NCZ000-SCZ000-TNZ000-VAZ000-182200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 500

NWS STORM PREDICTION CENTER NORMAN OK

1105 AM EDT SAT JUN 18 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF NORTHERN GEORGIA

       WESTERN NORTH CAROLINA

       PARTS OF WESTERN SOUTH CAROLINA

       MUCH OF EASTERN TENNESSEE

       PARTS OF WESTERN VIRGINIA



EFFECTIVE THIS SATURDAY MORNING AND EVENING FROM 1105 AM UNTIL

600 PM EDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST

SOUTHWEST OF CHATTANOOGA TENNESSEE TO 50 MILES SOUTHEAST OF

BRISTOL TENNESSEE.  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 499...



DISCUSSION...WELL DEVELOPED SQUALL LINE EXPECTED TO INTENSIFY AS IT

MOVES ACROSS THE WATCH AREA FROM W-E.  AIR MASS IS HEATING RAPIDLY

IN ADVANCE OF THE LINE WITH MLCAPES AOA 2000 J/KG AND LITTLE

REMAINING CINH BY EARLY AFTERNOON. WITH 30-40KT OF MID LEVEL FLOW

AND STEEP LAPSE RATES BOWING SEGMENTS WITHIN THE SQUALL LINE WILL

ENHANCE WIND DAMAGE POTENTIAL.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 28030.





...HALES

