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Severe Thunderstorm Watch 504
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WW0504 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.
   SEL4

   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 504
   NWS STORM PREDICTION CENTER NORMAN OK
   215 PM CDT SAT SEP 20 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     NORTHERN ILLINOIS
     NORTHERN INDIANA
     SOUTHWEST LOWER MICHIGAN
     LAKE MICHIGAN

   * EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 215 PM UNTIL
     900 PM CDT.

   * PRIMARY THREATS INCLUDE...
     ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
     ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTH OF
   BURLINGTON IOWA TO 50 MILES SOUTHEAST OF KALAMAZOO MICHIGAN.  FOR
   A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU4).

   PRECAUTIONARY/PREPAREDNESS ACTIONS...

   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 503...

   DISCUSSION...EXPECT STORM COVERAGE AND INTENSITY TO GRADUALLY
   INCREASE ACROSS PARTS OF THE MIDWEST THROUGH LATE AFTN. BULK OF
   CONVECTION SHOULD FOCUS ALONG A PRE-FRONTAL TROUGH AXIS SITUATED
   FROM THE MS RIVER EAST-NORTHEAST ACROSS NORTHERN IL AND INTO
   NORTHERN IND AND SOUTHWEST MI. SBCAPE WITHIN THIS CORRIDOR WAS
   AROUND 2000 J/KG AND BOTH SHEAR AND LARGER SCALE FORCING ARE
   EXPECTED TO STRENGTHEN SUFFICIENTLY TO RESULT IN ORGANIZED STORMS
   AND A FEW SUPERCELLS CAPABLE OF GENERATING DAMAGING WINDS AND HAIL.
   STORM MERGERS AND INCREASING CONVERGENCE ALONG A COLD FRONT SETTLING
   INTO THE REGION LATER TODAY COULD MAINTAIN THE CHANCE FOR SEVERE
   STORMS...AT LEAST INTO THE EARLY EVENING.

   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 450. MEAN STORM
   MOTION VECTOR 28025.


   ...CARBIN
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Page last modified: September 21, 2014
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