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Severe Thunderstorm Watch 480
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WW0480 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
High 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.
   SEL0
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 480
   NWS STORM PREDICTION CENTER NORMAN OK
   225 PM CDT FRI JUN 19 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTHEAST AND EAST CENTRAL IOWA
          NORTHERN AND CENTRAL ILLINOIS
          NORTHWEST INDIANA
          NORTHEAST MISSOURI
          LAKE MICHIGAN
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 225 PM UNTIL
   1000 PM CDT.
   
   HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
   MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 100
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES WEST
   SOUTHWEST OF BURLINGTON IOWA TO 45 MILES NORTH NORTHEAST OF
   DANVILLE 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 477...WW 478...WW 479...
   
   DISCUSSION...WIDELY SCATTERED STORMS ARE DEVELOPING OVER CENTRAL IL
   IN A VERY UNSTABLE AIR MASS...WHILE UPSTREAM STORMS OVER NWRN MO AND
   SWRN IA ARE EXPECTED TO INTENSIFY AND ACCELERATE EWD LATER THIS
   AFTERNOON AND EVENING.  IN ADDITION...INITIALLY ELEVATED STORMS OVER
   CENTRAL MO MAY BECOME SURFACE-BASED SOON AND INTENSIFY AS THEY MOVE
   NEWD INTO NERN MO.  MLCAPE OF 2000-3000 J/KG COUPLED WITH 40-50 KT
   DEEP LAYER SHEAR WILL PROMOTE SEVERE STORM DEVELOPMENT...INCLUDING
   ISOLATED SUPERCELLS EARLY IN THE CONVECTIVE LIFE CYCLE TRANSITIONING
   TO BOW-ECHO SYSTEMS WITH TIME. THERE IS POTENTIAL FOR WIDESPREAD
   DAMAGING WINDS TO DEVELOP IN ADDITION TO LARGE HAIL...ESPECIALLY IF
   NWRN MO/SWRN IA STORMS GROW UPSCALE INTO A FORWARD-PROPAGATING MCS.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
   MOTION VECTOR 25040.
   
   
   ...WEISS
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