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978 

WWUS20 KWNS 150424

SEL8

SPC WW 150424

LAZ000-TXZ000-150900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 138

NWS STORM PREDICTION CENTER NORMAN OK

1125 PM CDT THU APR 14 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST LOUISIANA

       NORTHEAST TEXAS



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1125 PM

UNTIL 400 AM CDT.



HAIL TO 2 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 70

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH

NORTHWEST OF SHREVEPORT LOUISIANA TO 50 MILES SOUTH SOUTHWEST OF

LONGVIEW TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 136...WW 137...



DISCUSSION...BROKEN LINE OF SEVERE STORMS ALONG THE DRYLINE/COLD

FRONT WILL CONTINUE TO MOVE ESEWD THROUGH THE OVERNIGHT

HOURS...ACROSS NE TX AND NW LA.  STEEP LAPSE RATES AND MID 60S

DEWPOINTS WILL PROVIDE MODERATE INSTABILITY...WHILE VERTICAL SHEAR

WILL REMAIN FAVORABLE FOR SUPERCELLS WITHIN THE LINE.  AN ISOLATED

TORNADO CANNOT BE RULED OUT...BUT LARGE HAIL AND DAMAGING WINDS WILL

BE THE MAIN SEVERE WEATHER CONCERNS.



AVIATION...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 29025.





...THOMPSON

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