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493 

WWUS20 KWNS 151242

SEL0

SPC WW 151242

ALZ000-LAZ000-MSZ000-152000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 140

NWS STORM PREDICTION CENTER NORMAN OK

735 AM CDT FRI APR 15 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN AND NORTHERN ALABAMA

       CENTRAL AND EASTERN LOUISIANA

       CENTRAL AND SOUTHERN MISSISSIPPI



EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 735 AM UNTIL 300

PM CDT.



TORNADOES...HAIL TO 2 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 95 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES NORTHEAST OF MUSCLE

SHOALS ALABAMA TO 45 MILES SOUTH OF NATCHEZ MISSISSIPPI.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU0).



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 139...



DISCUSSION...NE-SW MS/LA SQLN EXPECTED TO CONTINUE GENERALLY EWD

THROUGH EARLY AFTERNOON.  SYSTEM MAY BREAK INTO MORE SEMI-DISCRETE

STORMS/LINE SEGMENTS...AND ADDITIONAL STORMS MAY FORM IN

CONFLUENT/MOISTENING LOW-LVL FLOW AHEAD OF LINE...AS SFC HEATING

FURTHER DESTABILIZES REGION.  12Z KJAN SOUNDING AND UPSTREAM WIND

PROFILES SUGGEST WW AREA WILL HAVE THERMODYNAMIC AND WIND

ENVIRONMENT SUPPORTIVE OF SUSTAINED SUPERCELLS AND LEWPS.  THESE MAY

YIELD A COUPLE STRONG TORNADOES...IN ADDITION TO DMGG WIND AND HAIL.

STORMS IN NRN AL MAY REMAIN SLIGHTLY ELEVATED...BUT WILL STILL HAVE

THE POTENTIAL TO PRODUCE LOCALLY DMGG WIND AND PERHAPS ISOLD

TORNADOES.



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

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

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

550. MEAN STORM MOTION VECTOR 25040.





...CORFIDI

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