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Severe Thunderstorm Watch 742
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WW0742 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Moderate Low

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL2
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 742
   NWS STORM PREDICTION CENTER NORMAN OK
   200 PM CDT MON SEP 21 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          EXTREME NORTHWEST ARKANSAS
          SOUTHEAST KANSAS
          SOUTHWEST AND CENTRAL MISSOURI
          CENTRAL AND EASTERN OKLAHOMA
          EXTREME NORTHWEST TEXAS
   
   EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 200 PM UNTIL
   1000 PM 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 75
   STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH
   NORTHWEST OF SPRINGFIELD MISSOURI TO 40 MILES SOUTH SOUTHEAST OF
   WICHITA FALLS TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE
   THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).
   
   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...THUNDERSTORMS WILL GRADUALLY INCREASE IN
   COVERAGE/INTENSITY ACROSS MO/SE KS AND OK THIS AFTERNOON AS THE LOW
   LEVELS CONTINUE TO DESTABILIZE IN ADVANCE OF A COLD FRONT AND
   PRE-FRONTAL TROUGH.  DEEP LAYER VERTICAL SHEAR IS SOMEWHAT MARGINAL
   FOR SUPERCELLS IN THE WARM SECTOR...WHILE MLCAPE VALUES RANGE FROM
   2000-3000 J/KG BASED ON SURFACE TEMPERATURES IN THE 80S WITH
   BOUNDARY LAYER DEWPOINTS OF 68-70 F.  IT APPEARS THAT LARGE HAIL AND
   DAMAGING WINDS WILL BE THE MAIN SEVERE THREATS THIS AFTERNOON.  THE
   SEVERE THREAT WILL CONTINUE INTO THIS EVENING AND EARLY TONIGHT AS
   STORMS GRADUALLY EVOLVE INTO AN EXTENSIVE BAND ALONG THE FRONT AND
   SPREAD EWD/SEWD.
   
   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 26025.
   
   
   ...THOMPSON
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