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Severe Thunderstorm Watch 426
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WW0426 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
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.
   SEL6
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 426
   NWS STORM PREDICTION CENTER NORMAN OK
   210 PM CDT SAT JUN 4 2011
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          PARTS OF NORTHEAST ILLINOIS
          MUCH OF NORTHERN INDIANA
          PARTS OF SOUTHERN LOWER MICHIGAN
          PARTS OF NORTHWEST OHIO
          LAKE ERIE
          LAKE MICHIGAN
   
   EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 210 PM UNTIL
   900 PM CDT.
   
   HAIL TO 2.5 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 70
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTH
   SOUTHWEST OF MARSEILLES ILLINOIS TO 35 MILES SOUTH SOUTHEAST OF
   MOUNT CLEMENS MICHIGAN.  FOR A COMPLETE DEPICTION OF THE WATCH
   SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).
   
   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...WITH AIR MASS ACROSS THE WATCH VERY UNSTABLE WITH
   MLCAPES AOA 3000J/KG AND LITTLE REMAINING CINH...THUNDERSTORMS
   EXPECTED TO DEVELOP RAPIDLY REMAINDER OF AFTERNOON AND SPREAD
   EASTWARD.  WITH STEEP LAPSE RATES COUPLED WITH 30-40KT OF
   SHEAR...LARGE HAIL AND DAMAGING WINDS WILL BE POSSIBLE WITH THE
   STRONGEST STORMS.  INITIAL DEVELOPMENT WILL TAKE PLACE ON SUBTLE
   SURFACE BOUNDARIES SUCH AS LAKE BREEZE FRONTS OF LM/LH.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM
   MOTION VECTOR 27025.
   
   
   ...HALES
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