

394 

WWUS20 KWNS 131743

SEL7

SPC WW 131743

ALZ000-GAZ000-NCZ000-SCZ000-TNZ000-140000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 307

NWS STORM PREDICTION CENTER NORMAN OK

145 PM EDT THU JUN 13 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHERN ALABAMA

  NORTHERN GEORGIA

  WESTERN NORTH CAROLINA

  NORTHWEST SOUTH CAROLINA

  MIDDLE AND EASTERN TENNESSEE



* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 145 PM UNTIL

  800 PM EDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL SIGNIFICANT DAMAGING WIND GUSTS TO 75 MPH POSSIBLE

  SEVERAL VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES NORTH

NORTHWEST OF MUSCLE SHOALS ALABAMA TO 40 MILES EAST NORTHEAST OF

CHARLOTTE NORTH CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH

SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 305...WW 306...



DISCUSSION...POTENTIAL FOR SEVERE THUNDERSTORMS WILL INCREASE ACROSS

THE WATCH AREA THROUGH THE AFTERNOON AS A COLD FRONT SUPPORTED BY

STRONG UPPER TROUGH SPREADS SOUTHWARD. VERY UNSTABLE AIRMASS NOW

SITUATED AHEAD OF THE FRONT AND UPPER SYSTEM WILL FUEL INTENSE

THUNDERSTORM UPDRAFTS THAT WILL DEVELOP AMIDST STRONG UNIDIRECTIONAL

SHEAR. RESULTING STORMS SHOULD ATTAIN SUPERCELL/SPLITTING CELL

CHARACTER WITH LARGE HAIL AND HIGH WINDS LIKELY. WITH TIME...CELL

MERGERS OR SOME CLUSTERING MAY SUPPORT THE DEVELOPMENT OF LINE

SEGMENTS/LEWPS WITH INCREASING CHANCE FOR MORE WIDESPREAD WIND

DAMAGE.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 32035.





...CARBIN

