

436 

WWUS20 KWNS 240246

SEL0

SPC WW 240246

ARZ000-OKZ000-240900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 350

NWS STORM PREDICTION CENTER NORMAN OK

945 PM CDT MON MAY 23 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND WEST CENTRAL ARKANSAS

       CENTRAL AND EAST CENTRAL OKLAHOMA



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 945 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 45

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES NORTHWEST

OF CHICKASHA OKLAHOMA TO 55 MILES NORTHEAST OF PINE BLUFF

ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

TORNADO WATCH NUMBER 345...TORNADO WATCH NUMBER 348. WATCH NUMBER

345 348 WILL NOT BE IN EFFECT AFTER 945 PM CDT. CONTINUE...WW

346...WW 349...



DISCUSSION...OUTFLOW BOUNDARY REINFORCED BY ONGOING CONVECTION WILL

CONTINUE TO SAG SWD ACROSS CENTRAL/ERN OK...WITH STORM DEVELOPMENT

EXPECTED ATOP THE COLD POOL IN ASSOCIATION WITH WAA AND A 35-40 KT

LLJ.  LARGE HAIL AND ISOLATED DAMAGING WINDS WILL BE THE MAIN

THREATS WITH THIS ACTIVITY.  FARTHER E INTO AR...MULTIPLE EARLIER

ROUNDS OF CONVECTION HAVE LEFT A SL0W-MOVING OUTFLOW ACROSS CENTRAL

AR.  THIS BOUNDARY WILL SERVE TO FOCUS THE EWD MOVEMENT OF THE

CLUSTER ALONG THE AR/OK BORDER.  THERE WILL BE SOME POTENTIAL FOR

FORWARD PROPAGATION AND AN ASSOCIATED RISK FOR DAMAGING WINDS...BUT

THE MAGNITUDE AND ERN EXTENT OF THE SEVERE THREAT ARE SOMEWHAT IN

QUESTION OVERNIGHT.



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

