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Severe Thunderstorm Watch 340
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WW0340 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Moderate 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.
   SEL0
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 340
   NWS STORM PREDICTION CENTER NORMAN OK
   1055 AM CDT MON MAY 23 2011
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTHWEST ILLINOIS
          WESTERN KENTUCKY
          EASTERN MISSOURI
   
   EFFECTIVE THIS MONDAY MORNING AND EVENING FROM 1055 AM UNTIL 600
   PM CDT.
   
   HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75
   MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES WEST
   SOUTHWEST OF FORT LEONARD WOOD MISSOURI TO 10 MILES NORTH OF
   CARBONDALE ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE
   THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).
   
   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 337...WW 338...WW 339...
   
   DISCUSSION...MCS WITH WELL-DEFINED MCV IS EXPECTED TO RE-INTENSIFY
   THIS AFTERNOON AS IT PROGRESSES EWD AND ENCOUNTERS AN INCREASINGLY
   MOIST AND UNSTABLE AIR MASS ALONG THE MS RIVER WITH MLCAPE
   INCREASING TO 2000-3000 J/KG.  THIS INSTABILITY COUPLED WITH A DEEP
   WSWLY WIND FIELD WILL SUPPORT FORWARD-PROPAGATION OF MCS WITH THE
   PRIMARY HAZARDS BEING CORRIDORS OF WIND DAMAGE AND LARGE HAIL.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 27035.
   
   
   ...MEAD
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