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WWUS20 KWNS 122019

SEL3

SPC WW 122019

ARZ000-KSZ000-MOZ000-OKZ000-TXZ000-130300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 293

NWS STORM PREDICTION CENTER NORMAN OK

320 PM CDT THU MAY 12 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN ARKANSAS

       EXTREME SOUTHEASTERN KANSAS

       SOUTHWESTERN MISSOURI

       EASTERN OKLAHOMA

       EXTREME NORTH CENTRAL TEXAS



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 320 PM UNTIL

1000 PM 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 95

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

NORTHEAST OF SPRINGFIELD MISSOURI TO 25 MILES SOUTH SOUTHEAST OF

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 290...WW 291...WW 292...



DISCUSSION...STORMS ARE EXPECTED TO DEVELOP ALONG AND AHEAD OF EWD

ADVANCING PACIFIC FRONT WHERE THE ATMOSPHERE HAS BECOME MODERATELY

UNSTABLE WITH 2000-2500 J/KG MLCAPE. DESPITE SMALL LOW LEVEL

HODOGRAPHS...EFFECTIVE SHEAR IS SUPPORTIVE OF SUPERCELLS WITH LARGE

HAIL AND DAMAGING WIND THE MAIN THREATS. A FEW STORMS COULD ALSO

EVOLVE INTO BOWING LINE SEGMENTS WITH TIME.



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.





...DIAL

