

000 

WWUS20 KWNS 300952

SEL9

SPC WW 300952

OKZ000-TXZ000-301600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 309

NWS STORM PREDICTION CENTER NORMAN OK

450 AM CDT WED MAY 30 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST AND SOUTH-CENTRAL OKLAHOMA

       NORTH-CENTRAL TEXAS



EFFECTIVE THIS WEDNESDAY MORNING FROM 450 AM UNTIL 1100 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 50

STATUTE MILES EITHER SIDE OF A LINE FROM 20 MILES NORTH NORTHWEST

OF FORT SILL OKLAHOMA TO 35 MILES EAST NORTHEAST OF DALLAS TEXAS.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU9).



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.



DISCUSSION...MCS ONGOING OVER PORTIONS OF CNTRL AND SWRN OK IS

EXPECTED TO CONTINUE SEWD INTO N-CNTRL TX LATER THIS MORNING.  GIVEN

MODERATE INSTABILITY /MUCAPES OF 2000-3000 J PER KG/ IN PLACE ACROSS

DOWNSTREAM AIR MASS...POTENTIAL WILL EXIST FOR EMBEDDED SEVERE

STORMS CAPABLE OF DAMAGING WINDS.  OTHER MORE DISCRETE STORMS

DEVELOPING DOWNSTREAM FROM MCS OVER S-CNTRL OK INTO N-CNTRL TX WILL

POSE A LARGE HAIL THREAT.



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 500. MEAN STORM

MOTION VECTOR 31035.





...MEAD/HALES

