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311 

WWUS20 KWNS 120225

SEL7

SPC WW 120225

ARZ000-OKZ000-120900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 377

NWS STORM PREDICTION CENTER NORMAN OK

925 PM CDT MON JUN 11 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME WEST CENTRAL ARKANSAS

       SOUTH CENTRAL AND SOUTHEAST OKLAHOMA



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 925 PM UNTIL

400 AM CDT.



HAIL TO 2.5 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 20 MILES SOUTH

SOUTHWEST OF ARDMORE OKLAHOMA TO 10 MILES EAST SOUTHEAST OF

POTEAU OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 374...WW 375...WW 376...



DISCUSSION...SEVERE STORMS IN N TX WILL LIKELY SPREAD ENEWD INTO S

CENTRAL OK...ALONG A SLOW-MOVING FRONT...WITH ADDITIONAL DEVELOPMENT

POSSIBLE ALONG THE FRONT INTO E CENTRAL/SE OK.  A RESERVOIR OF

STRONG INSTABILITY REMAINS ALONG AND S OF THE FRONT...IN AN

ENVIRONMENT WITH SUFFICIENT DEEP-LAYER VERTICAL SHEAR FOR

SUPERCELLS.  THUS...THE DEVELOPING STORMS WILL POSE A RISK FOR LARGE

HAIL /SOME OF WHICH COULD EXCEED 2 INCHES IN DIAMETER/...AS WELL AS

DAMAGING GUSTS.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 27020.





...THOMPSON

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