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944 

WWUS20 KWNS 041246

SEL0

SPC WW 041246

ARZ000-LAZ000-TXZ000-042000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 90

NWS STORM PREDICTION CENTER NORMAN OK

745 AM CDT MON APR 4 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWESTERN ARKANSAS

       NORTHWESTERN LOUISIANA

       CENTRAL AND EAST TEXAS



EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 745 AM UNTIL 300

PM CDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 105

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH

NORTHWEST OF SHREVEPORT LOUISIANA TO 35 MILES SOUTHWEST OF

COLLEGE STATION TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 87...WW 88...WW 89...



DISCUSSION...ORGANIZING BAND OF STG-SVR CONVECTION...INVOF SFC COLD

FRONT...IS FCST TO CONTINUE INTENSIFYING AS FRONTAL/CONVERGENCE ZONE

IMPINGES UPON PROGRESSIVELY RICHER LOW-LEVEL THETAE.  VERTICAL WIND

PROFILES INDICATE DOMINANT QUASI-LINEAR MODE WITH EMBEDDED LEWP/BOW

FORMATIONS.  PRIMARY THREAT IS DAMAGING WIND...THOUGH BRIEF QLCS

TORNADO CANNOT BE RULED OUT.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 26035.





...EDWARDS

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