

556 

WWUS20 KWNS 200442

SEL7

SPC WW 200442

GAZ000-NCZ000-SCZ000-201100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 177

NWS STORM PREDICTION CENTER NORMAN OK

1245 AM EDT MON APR 20 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF NORTHEAST GEORGIA

       PARTS OF SOUTHWESTERN NORTH CAROLINA

       PARTS OF WESTERN SOUTH CAROLINA



EFFECTIVE THIS MONDAY MORNING FROM 1245 AM UNTIL 700 AM EDT.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE

MILES EITHER SIDE OF A LINE FROM 35 MILES WEST SOUTHWEST OF

ATHENS GEORGIA TO 50 MILES EAST NORTHEAST OF SPARTANBURG SOUTH

CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 175...WW 176...



DISCUSSION...STRONG COUPLED JET ACCOMPANYING UPPER TROUGH

TRANSLATING ACROSS WATCH AREA PROVIDING VERY FAVORABLE SHEAR

PROFILES FOR LOW TOPPED SUPERCELLS.  INSTABILITY LIMITED...HOWEVER

SUFFICIENT...REF OBSERVED LIGHTNING IN NERN GA FOR THUNDERSTORMS.

THUS TORNADOS WILL BE POSSIBLE WITH ANY ROTATING STORM THAT DEVELOPS

IN THIS FAVORABLE SHEAR AND KINEMATIC ENVIRONMENT.



AVIATION...TORNADOES AND 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 400.

MEAN STORM MOTION VECTOR 24040.





...HALES

