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Severe Thunderstorm Watch 307
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WW0307 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.
   SEL7

   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 307
   NWS STORM PREDICTION CENTER NORMAN OK
   900 PM CDT MON JUN 16 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     EAST CENTRAL IOWA
     NORTHWEST ILLINOIS

   * EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 900 PM
     UNTIL 300 AM CDT.

   * PRIMARY THREATS INCLUDE...
     SCATTERED DAMAGING WIND GUSTS TO 70 MPH LIKELY
     ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE
     A TORNADO OR TWO POSSIBLE

   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST OF
   CEDAR RAPIDS IOWA TO 65 MILES EAST NORTHEAST OF MOLINE ILLINOIS. 
   FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU7).

   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 303...WW 304...WW
   305...WW 306...

   DISCUSSION...WELL-DEVELOPED MCS WITH SOME EMBEDDED SUPERCELL
   STRUCTURES WILL CONTINUE TO MOVE ESEWD/SEWD ACROSS ERN IA/NW
   IL...ALONG THE INSTABILITY GRADIENT.  THE MAIN RISK WITH THESE
   STORMS WILL BE DAMAGING WINDS...BUT A TORNADO OR TWO CANNOT BE RULED
   OUT WITH LEADING EDGE CIRCULATIONS.  THE STRONGER EMBEDDED STORMS
   MAY ALSO PRODUCE ISOLATED LARGE HAIL.

   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 550. MEAN STORM
   MOTION VECTOR 29030.


   ...THOMPSON
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Page last modified: June 17, 2014
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