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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 266

NWS STORM PREDICTION CENTER NORMAN OK

740 PM CDT MON MAY 7 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST LOUISIANA

       NORTHEAST TEXAS



EFFECTIVE THIS MONDAY NIGHT FROM 740 PM UNTIL MIDNIGHT CDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

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

NORTHWEST OF SHREVEPORT LOUISIANA TO 35 MILES SOUTH SOUTHWEST OF

SHREVEPORT LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 261...WW 263...WW

264...WW 265...



DISCUSSION...CLUSTER OF SEVERE STORMS THAT FORMED EARLIER IN SW AR

CONTINUES TO MOVE SSEWD NEAR THE INTERSECTION WITH A SEPARATE N-S

OUTFLOW BOUNDARY ACROSS LA.  FARTHER W...SCATTERED STORMS HAVE

FORMED ALONG THE COLD FRONT IN NE TX...AND THESE STORMS SHOULD

SPREAD SEWD WITH THE FRONT AND MERGING OUTFLOW TRAILING W FROM THE

SW AR CLUSTER.  MODERATE INSTABILITY TO THE S OF THE ONGOING STORMS

SHOULD MAINTAIN A DAMAGING WIND/LARGE HAIL RISK FOR A FEW MORE

HOURS...BEFORE THE BOUNDARY LAYER STABILIZES WITH NOCTURNAL COOLING.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 33020.





...THOMPSON

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