

576 

WWUS20 KWNS 200143

SEL7

SPC WW 200143

GAZ000-NCZ000-SCZ000-TNZ000-200700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 517

NWS STORM PREDICTION CENTER NORMAN OK

945 PM EDT SUN JUN 19 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST GEORGIA

       WESTERN NORTH CAROLINA

       WESTERN SOUTH CAROLINA

       EASTERN TENNESSEE



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 945 PM UNTIL

300 AM 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 45

STATUTE MILES EITHER SIDE OF A LINE FROM 60 MILES WEST OF

KNOXVILLE TENNESSEE TO 25 MILES NORTHEAST OF ANDERSON SOUTH

CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 513...WW 514...WW

515...WW 516...



DISCUSSION...SMALL MCS NOW IN ERN PART OF MIDDLE TN EVOLVED FROM

EARLIER DISCRETE SUPERCELLS FARTHER WNW.  00Z BNA SOUNDING AND AREA

VWP DATA SHOW PLUME OF WARM/MOIST LOWER TROPOSPHERIC FLOW OVER THE

TN VLY...ALONG WITH FAIRLY STEEP LAPSE RATES.  COUPLED WITH WNW MID

LVL FLOW...SETUP MAY FOSTER CONTINUE ESE TO PERHAPS SE MOTION OF

MCS...WITH AN ASSOCIATED RISK FOR LOCALLY DMGG WIND AND MARGINALLY

SVR HAIL AS SYSTEM ENCOUNTERS HIGHER TERRAIN OF THE SRN

APPALACHIANS.



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 30030.





...CORFIDI

