

490 

WWUS20 KWNS 232224

SEL8

SPC WW 232224

ARZ000-OKZ000-240500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 348

NWS STORM PREDICTION CENTER NORMAN OK

525 PM CDT MON MAY 23 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       A SMALL PART OF WEST CENTRAL AND NORTHWEST ARKANSAS

       NORTHEAST AND EAST CENTRAL OKLAHOMA



EFFECTIVE THIS MONDAY AFTERNOON FROM 525 PM UNTIL MIDNIGHT CDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 95 STATUTE

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

BARTLESVILLE OKLAHOMA TO 35 MILES SOUTHWEST OF MCALESTER

OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 340...WW 341...WW

342...WW 343...WW 344...WW 345...WW 346...WW 347...



DISCUSSION...MASS OF CONVECTION WITH EMBEDDED SUPERCELLS OVER N

CENTRAL OK WILL CONTINUE TO EXPAND OVER THE NEXT FEW HOURS...WITH

MULTIPLE STORM MERGERS AND UPSCALE GROWTH LIKELY THIS EVENING.

INITIALLY...THE STORMS WILL BE CAPABLE OF PRODUCING A COUPLE OF

TORNADOES AND ISOLATED VERY LARGE HAIL.  LATER THIS

EVENING...MCS/BOW ECHO FORMATION WILL BE POSSIBLE AS STORMS RIDE

ESEWD ALONG A STALLED OUTFLOW BOUNDARY ACROSS E/NE OK INTO WRN AR.

DAMAGING WINDS WILL BE AN INCREASING CONCERN...THOUGH A COUPLE OF

TORNADOES WILL STILL BE POSSIBLE AS STORMS INTERACT WITH THE OUTFLOW

BOUNDARY.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 29035.





...THOMPSON

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