

626 

WWUS20 KWNS 022234

SEL0

SPC WW 022234

ALZ000-GAZ000-NCZ000-TNZ000-030400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 610

NWS STORM PREDICTION CENTER NORMAN OK

635 PM EDT SUN SEP 2 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN AND CENTRAL ALABAMA

       NORTHWEST GEORGIA

       FAR WESTERN NORTH CAROLINA

       SOUTHEAST TENNESSEE



EFFECTIVE THIS SUNDAY NIGHT FROM 635 PM UNTIL MIDNIGHT EDT.



HAIL TO 1 INCH 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 50

STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTHEAST OF

CHATTANOOGA TENNESSEE TO ANNISTON ALABAMA.  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 608...WW 609...



DISCUSSION...CURRENT TRENDS IN RADAR DATA INDICATE THAT STORMS OVER

NRN AL ARE EVOLVING INTO A QLCS WITH GENERAL EWD MOTION OF AROUND 30

KT.  A GROWING/DEEPENING COLD POOL SHOULD EVENTUALLY ALLOW FOR MORE

OF A SEWD PROPAGATION TO CONVECTIVE SYSTEM AS A HOT AND MOIST

BOUNDARY LAYER WITH MLCAPE OF 1000-2000 J/KG IS ENTRAINED ALONG

LEADING GUST FRONT.  WHILE A BRIEF TORNADO IS POSSIBLE...IT APPEARS

THAT DAMAGING WINDS WILL BE THE PRIMARY SEVERE WEATHER HAZARD.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

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

VECTOR 27030.





...MEAD

