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Severe Thunderstorm Watch 318
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WW0318 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
Severe Hail 2"+ Hail
Moderate 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.
   SEL8

   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 318
   NWS STORM PREDICTION CENTER NORMAN OK
   1015 PM CDT TUE JUN 17 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     NORTHEAST IOWA
     NORTHERN ILLINOIS
     EXTREME NORTHWEST INDIANA
     SOUTHERN WISCONSIN
     LAKE MICHIGAN

   * EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1015 PM
     UNTIL 400 AM CDT.

   * PRIMARY THREATS INCLUDE...
     SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2
       INCHES IN DIAMETER POSSIBLE
     SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
     A TORNADO OR TWO POSSIBLE

   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES NORTH
   NORTHWEST OF CEDAR RAPIDS IOWA TO 60 MILES SOUTHEAST OF RACINE
   WISCONSIN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

   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 313...WW 314...WW
   315...WW 316...WW 317...

   DISCUSSION...STORMS WILL CONTINUE TO INCREASE IN COVERAGE/INTENSITY
   FROM E/NE IA INTO NRN IL ALONG THE WARM FRONT DURING THE NEXT FEW
   HOURS.  ADDITIONAL STORM DEVELOPMENT WILL ALSO BE POSSIBLE JUST N OF
   THE BOUNDARY INTO SRN WI AS A STRENGTHENING LOW-LEVEL JET OVER IA
   SUPPORTS INCREASING WARM ADVECTION.  THE COMBINATION OF STRONG
   INSTABILITY AND VERTICAL SHEAR WILL BE SUFFICIENT FOR SUPERCELLS
   INITIALLY...WHEN A TORNADO CANNOT BE RULED OUT.  HOWEVER...THE
   PRIMARY RISKS WILL BE LARGE HAIL WITH THE INITIAL STORMS...AND
   DAMAGING WINDS AS STORMS EVENTUALLY GROW UPSCALE INTO OR MORE
   CLUSTERS.

   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 550. MEAN STORM
   MOTION VECTOR 28025.


   ...THOMPSON
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Page last modified: June 18, 2014
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