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Severe Thunderstorm Watch 477
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WW0477 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Low
Severe Wind 65 kt+ Wind
Moderate 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.
   SEL7
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 477
   NWS STORM PREDICTION CENTER NORMAN OK
   715 AM CDT FRI JUN 19 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          EASTERN IOWA
          NORTHERN ILLINOIS
          SOUTHERN WISCONSIN
          LAKE MICHIGAN
   
   EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 715 AM UNTIL 300
   PM 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 60
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTHWEST
   OF CEDAR RAPIDS IOWA TO 20 MILES SOUTH OF MEIGS FIELD ILLINOIS. 
   FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU7).
   
   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 475...WW 476...
   
   DISCUSSION...E CNTRL IA STORM CLUSTER EXPECTED TO CONTINUE GENERALLY
   ENE INTO WRN IL...WITH A CONTINUED THREAT FOR HIGH WIND/HAIL.  OTHER
   STORMS MAY FORM IN ITS VICINITY IN RESPONSE TO SFC HEATING A BIT
   LATER THIS MORNING...AND ATOP OUTFLOW LEFT BY OVERNIGHT MCS IN NRN
   IL.  AREA WIND PROFILES AND THERMODYNAMIC ENVIRONMENT APPEAR
   FAVORABLE FOR BOWING SEGMENTS WITH HIGH WIND/HAIL.  EXACT NATURE OF
   STORM INTERACTION WITH/DEVELOPMENT ALONG THE NRN IL OUTFLOW BOUNDARY
   IS UNCERTAIN ATTM.  BUT A NON-ZERO THREAT COULD DEVELOP FOR LOW
   LEVEL STORM ROTATION/POSSIBLE TORNADOES AS BOUNDARY LAYER RECOVERY
   OCCURS IN WAKE OF GUST FRONT.
   
   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 500. MEAN STORM
   MOTION VECTOR 26040.
   
   
   ...CORFIDI
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