

602 

WWUS20 KWNS 240251

SEL1

SPC WW 240251

OKZ000-TXZ000-241000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 191

NWS STORM PREDICTION CENTER NORMAN OK

955 PM CDT SAT APR 23 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       LARGE PART OF CENTRAL AND EASTERN OKLAHOMA

       PARTS OF NORTHERN TEXAS



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 955 PM

UNTIL 500 AM CDT.



HAIL TO 2.5 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 80

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES EAST

NORTHEAST OF BARTLESVILLE OKLAHOMA TO 20 MILES SOUTH SOUTHWEST OF

SHERMAN TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 187...WW 189...WW 190...



DISCUSSION...WITH CONSIDERABLE ELEVATED INSTABILITY AND INCREASING

LOW LEVEL JET...THUNDERSTORMS ARE DEVELOPING NWD THRU ERN HALF OF

OK.  WITH MUCAPES UPWARDS TO 2500 J/KG AND BRN SHEAR OF

40-50KT...ELEVATED SUPERCELLS ARE LIKELY WITH LARGE HAIL POTENTIAL.



AVIATION...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 500. MEAN STORM

MOTION VECTOR 24035.





...HALES

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