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588 

WWUS20 KWNS 120452

SEL8

SPC WW 120452

ARZ000-OKZ000-TXZ000-121100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 378

NWS STORM PREDICTION CENTER NORMAN OK

1155 PM CDT MON JUN 11 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST ARKANSAS

       EXTREME SOUTHEAST OKLAHOMA

       NORTHEAST TEXAS



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1155 PM

UNTIL 600 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 45

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES SOUTHWEST

OF SHERMAN TEXAS TO 40 MILES NORTH NORTHEAST OF EL DORADO

ARKANSAS.  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 376...WW 377...



DISCUSSION...MASS OF CONVECTION ACROSS THE RED RIVER VALLEY COULD

EVENTUALLY LEAD TO MORE MERGERS AND UPSCALE GROWTH...WHILE OTHER

STORMS FORM IN THE ZONE OF WAA IMMEDIATELY NE OF THE RESIDUAL

OUTFLOW BOUNDARY ACROSS SW AR.  GIVEN STRONG INSTABILITY THE REMAINS

INVOF THE ARKLATEX...THERE WILL BE THE POTENTIAL FOR ISOLATED LARGE

HAIL WITH THE INITIAL STORMS...AND PERHAPS AN INCREASING THREAT FOR

DAMAGING WINDS IF/WHEN UPSCALE GROWTH OCCURS INTO A LARGER MCS.



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 31020.





...THOMPSON

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