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WWUS20 KWNS 072219

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ARZ000-OKZ000-TXZ000-080300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 265

NWS STORM PREDICTION CENTER NORMAN OK

520 PM CDT MON MAY 7 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST ARKANSAS

       EXTREME SOUTHEAST OKLAHOMA

       EXTREME NORTHEAST TEXAS



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 520 PM UNTIL

1000 PM 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 55

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTHEAST OF

DE QUEEN ARKANSAS TO 35 MILES WEST SOUTHWEST OF EL DORADO

ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 262...WW

263...WW 264...



DISCUSSION...A CLUSTER OF SEVERE STORMS HAS DEVELOPED NEAR THE

INTERSECTION OF A COLD FRONT AND AN OUTFLOW BOUNDARY IN SW AR.

MODERATE-STRONG INSTABILITY IS PRESENT IN ADVANCE OF THESE

STORMS...WHICH WILL LIKELY PROGRESS SEWD ALONG THE RESIDUAL OUTFLOW

BOUNDARY...WITH SOME POSSIBILITY OF WWD DEVELOPMENT INTO SE OK/NE

TX.  VERTICAL SHEAR IS SOMEWHAT ENHANCED ALONG THE OUTFLOW...WHICH

WILL PROMOTE ORGANIZED MULTICELL CLUSTERS CAPABLE OF PRODUCING LARGE

HAIL AND DAMAGING WINDS THROUGH LATE EVENING.



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 32015.





...THOMPSON

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