

517 

WWUS20 KWNS 301726

SEL5

SPC WW 301726

ALZ000-MSZ000-310000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 785

NWS STORM PREDICTION CENTER NORMAN OK

1225 PM CDT FRI OCT 30 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN ALABAMA

       EASTERN MISSISSIPPI



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1225 PM UNTIL

700 PM CDT.



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 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES WEST NORTHWEST OF

MUSCLE SHOALS ALABAMA TO 35 MILES SOUTH SOUTHWEST OF PINE BELT

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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.



DISCUSSION...EXPECT THUNDERSTORMS TO INCREASE IN COVERAGE AND

INTENSITY ACROSS THE WATCH AREA THROUGH THE AFTERNOON AS HEATING OF

THE DAY AIDS IN BOOSTING SURFACE-BASED INSTABILITY AND STRONG COLD

FRONT PROGRESSES GRADUALLY EAST INTO VERY MOIST AIR MASS. RADAR IS

ALREADY INDICATING WEAK ROTATION WITH MANY OF THE MORE PERSISTENT

CELLS THAT HAVE INCREASED THROUGH THE MORNING. BOTH DEEP-LAYER SHEAR

AND LOW LEVEL HELICITY VALUES WILL CONTINUE TO SUPPORT STORM

ROTATION/MESOCYCLONES WITH AN INCREASING CHANCE THAT FAST-MOVING

CELLS COULD PRODUCE WIND DAMAGE OR ISOLATED BRIEF TORNADOES AS

GREATER INSTABILITY IS REALIZED.



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 21035.





...CARBIN

