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WWUS20 KWNS 101908

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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 21

NWS STORM PREDICTION CENTER NORMAN OK

105 PM CST WED MAR 10 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF CENTRAL AND SOUTHERN ALABAMA

       PARTS OF SOUTHERN AND EASTERN MISSISSIPPI



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 105 PM UNTIL

800 PM CST.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

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

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH OF MONTGOMERY

ALABAMA TO 55 MILES WEST NORTHWEST OF MERIDIAN MISSISSIPPI.  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...CONTINUE...WW 19...WW 20...



DISCUSSION...THUNDERSTORMS ARE DEVELOPING ACROSS THE WATCH AREA IN

RESPONSE TO SURFACE HEATING AND INCREASING INSTABILITY.  VEERING

SHEAR PROFILES...PARTICULARLY VICINITY WNW/ESE THERMAL BOUNDARY

FROM CENTRAL MS TO CENTRAL AL ARE FAVORABLE FOR SUPERCELL

DEVELOPMENT.  STEEP MID LEVEL LAPSE RATES AND DRY AIR AS NOTED ON

18Z JAN SOUNDING ARE VERY FAVORABLE FOR LARGE HAIL.  ALSO TORNADOS

WILL  BE POSSIBLE ASSOCIATED WITH ANY SUPERCELL THAT FORMS.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 24025.





...HALES

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