

098 

WWUS20 KWNS 302201

SEL7

SPC WW 302201

OKZ000-310500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 237

NWS STORM PREDICTION CENTER NORMAN OK

500 PM CDT SUN MAY 30 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTH CENTRAL OKLAHOMA



EFFECTIVE THIS SUNDAY AFTERNOON FROM 500 PM UNTIL MIDNIGHT 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 60

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

PONCA CITY OKLAHOMA TO 40 MILES WEST SOUTHWEST OF CHANDLER

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 236...



DISCUSSION...TSTMS EXPECTED TO DEVELOP SWD INTO CNTRL OK ALONG LOW

LVL CONFLUENCE ZONE EXTENDING THROUGH SFC LOW NEAR KEND...WHERE

BACKED LOW LVL FLOW IS PRESENT TO ENHANCE CONVERGENCE.  WEAK DEEP

SHEAR SHOULD LIMIT STORM SUSTENANCE/ORGANIZATION.  BUT DEGREE OF

SFC-BASED INSTABILITY COUPLED WITH FOCUSED LOW LVL ASCENT SUGGESTS

POTENTIAL FOR A FEW INSTANCES OF LARGE HAIL AND POSSIBLY DMGG WIND.



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 28010.





...CORFIDI

