

000 

WWUS20 KWNS 242357

SEL3

SPC WW 242357

OKZ000-250600-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 353

NWS STORM PREDICTION CENTER NORMAN OK

655 PM CDT SAT MAY 24 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN OKLAHOMA



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 655 PM

UNTIL 100 AM CDT.



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

GUSTS TO 70 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 45 MILES NORTH OF ENID

OKLAHOMA TO 45 MILES SOUTH OF ENID OKLAHOMA.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU3).



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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 347. WATCH NUMBER 347 WILL NOT BE IN EFFECT AFTER

655 PM CDT. CONTINUE...WW 346...WW 348...WW 349...WW 350...WW

351...WW 352...



DISCUSSION...ISOLD SUPERCELL CLUSTER CONTINUES TO CYCLICALLY EXHIBIT

ENHANCED LOW-LEVEL ROTATION AND INCREASED TORNADO POTENTIAL AS IT

EVOLVES SLOWLY E ALONG WEAKENING W-E OUTFLOW BOUNDARY OVER NRN OK.

CONTINUING PRESENCE OF VERY MOIST INFLOW...AND NOCTURNAL

STRENGTHENING OF SLY LLJ...SUGGEST THAT STORMS MAY CONTINUE TO FORM

ALONG BOUNDARY.  GIVEN DEGREE OF INSTABILITY PRESENT...ANY SUCH

ACTIVITY WILL POSE A SVR THREAT DESPITE LOSS OF SFC HEATING AND

MODEST DEEP SHEAR.  WWD-RETREATING N-S DRY LINE IN WRN OK MAY ALSO

SERVE AS A FOCUS FOR STORM INITIATION LATER THIS EVENING.



AVIATION...TORNADOES AND 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 25015.





...CORFIDI

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