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Severe Thunderstorm Watch 321
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WW0321 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
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.
   SEL1
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 321
   NWS STORM PREDICTION CENTER NORMAN OK
   1225 PM CDT TUE JUN 2 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          CENTRAL AND SOUTHERN ILLINOIS
          EXTREME SOUTHWESTERN INDIANA
          FAR NORTHWESTERN KENTUCKY
          EASTERN MISSOURI
   
   EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1225 PM UNTIL
   800 PM CDT.
   
   HAIL TO 1.5 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 75
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES SOUTH
   SOUTHWEST OF QUINCY ILLINOIS TO 55 MILES SOUTHEAST OF MATTOON
   ILLINOIS.  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.
   
   DISCUSSION...STORMS ARE DEVELOPING AHEAD OF UPPER LEVEL IMPULSES
   LOCATED IN FAR SERN IA AND SWRN MO. AIR MASS HAS BECOME MODERATELY
   UNSTABLE AND MLCAPES WILL APPROACH 3000 J/KG BY LATE AFTERNOON. THIS
   INSTABILITY ALONG WITH 20-30 KT DEEP LAYER SHEAR WILL FAVOR SEVERE
   MULTICELL SEVERE STORMS WITH HAIL AND DAMAGING WINDS.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 24020.
   
   
   ...IMY
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