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579 

WWUS20 KWNS 120826

SEL9

SPC WW 120826

ARZ000-LAZ000-TXZ000-121600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 379

NWS STORM PREDICTION CENTER NORMAN OK

325 AM CDT TUE JUN 12 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN ARKANSAS

       NORTHERN AND CENTRAL LOUISIANA

       NORTHEAST TEXAS



EFFECTIVE THIS TUESDAY MORNING FROM 325 AM UNTIL 1100 AM 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 105

STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES NORTH

NORTHWEST OF EL DORADO ARKANSAS TO 20 MILES SOUTH OF NATCHITOCHES

LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 377...WW 378...



DISCUSSION...STRONG TO INTENSE UPDRAFTS EXPECTED TOP CONTINUE

FORMING INVOF OUTFLOW BOUNDARY INTERSECTION OVER THE ARKLATEX

REGION...AND ESEWD ALONG/ATOP REMNANT OUTFLOW OVER S CNTRL AR/NE LA.

WHILE MEAN FLOW WILL REMAIN RELATIVELY WEAK...DEGREE OF BUOYANCY

PROVIDED BY DEEP EML ATOP VERY MOIST BOUNDARY LAYER LIKELY WILL

CONTINUE TO YIELD SCTD SUSTAINED STORMS...INTERMITTENT LINE

SEGMENTS...AND COMPLEX CLUSTERS CAPABLE OF DMGG WET MICROBURSTS AND

MARGINALLY SVR HAIL.  OVERALL CENTROID OF STRONGEST ACTIVITY

EXPECTED TO SHIFT GENERALLY SE TO POSSIBLY SSE WITH TIME.



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 29020.





...CORFIDI

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