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Severe Thunderstorm Watch 298
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WW0298 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
High Moderate

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL8
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 298
   NWS STORM PREDICTION CENTER NORMAN OK
   940 PM CDT WED MAY 13 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTHWEST ARKANSAS
          SOUTHERN AND EASTERN OKLAHOMA
          A SMALL PART OF NORTHWEST TEXAS
   
   EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 940 PM
   UNTIL 400 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 105
   STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHWEST OF
   HARRISON ARKANSAS TO 35 MILES WEST SOUTHWEST OF ARDMORE OKLAHOMA.
    FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU8).
   
   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 293...WW 295...WW
   296...WW 297...
   
   DISCUSSION...A BROKEN BAND OF SEVERE STORMS...WITH SOME EMBEDDED
   SUPERCELLS...CONTINUES TO DEVELOP SWD/SEWD ALONG THE COLD FRONT
   ACROSS OK.  DESPITE THE LOSS OF DAYTIME HEATING...STRONG INSTABILITY
   AND PRONOUNCED CONVERGENCE/LOW-LEVEL FRONTOGENESIS WILL HELP
   MAINTAIN EXISTING STORMS AND SUPPORT NEW DEVELOPMENT FOR THE NEXT
   SEVERAL HOURS.  LARGE HAIL CAN BE EXPECTED WITH THE STRONGEST
   STORMS...WHILE THE DAMAGING WIND THREAT SHOULD INCREASE SOME AS A
   RESULT OF STORM MERGERS/INTERACTIONS AND SUBSEQUENT COLD POOL AND
   SMALL BOW ECHO FORMATION.
   
   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 32020.
   
   
   ...THOMPSON
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Page last modified: May 14, 2009
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