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000 

WWUS20 KWNS 230542

SEL1

SPC WW 230542

ALZ000-231300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 731

NWS STORM PREDICTION CENTER NORMAN OK

1240 AM CDT TUE OCT 23 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN AND CENTRAL ALABAMA



EFFECTIVE THIS TUESDAY MORNING FROM 1240 AM UNTIL 800 AM 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 45 STATUTE

MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH NORTHEAST OF

GADSDEN ALABAMA TO 30 MILES SOUTH SOUTHEAST OF EVERGREEN ALABAMA.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 730. WATCH NUMBER 730 WILL NOT BE IN EFFECT AFTER

1240 AM CDT. CONTINUE...WW 729...



DISCUSSION...INTENSE CLUSTERS OF THUNDERSTORMS WITH PERSISTENT

ROTATION EXPECTED TO CONTINUE OVERNIGHT ACROSS WW AREA WITHIN

MARGINAL INSTABILITY AND VERY STRONG LOW-DEEP LAYER SHEAR.  HIGH

VALUES OF RH IN THE BOUNDARY LAYER AND SFC-1 KM SRH IN EXCESS OF 200

M2/S2 SHOULD REMAIN FAVORABLE FOR ISOLATED TORNADOES AND/OR DAMAGING

WINDS.



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 22540.





...EVANS

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