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Severe Thunderstorm Watch 334
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WW0334 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Low Low
Severe Hail 2"+ Hail
Low 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.
   SEL4

   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 334
   NWS STORM PREDICTION CENTER NORMAN OK
   840 AM CDT FRI JUN 21 2013

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     EASTERN IOWA
     NORTHERN ILLINOIS
     LAKE MICHIGAN

   * EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 840 AM UNTIL
     100 PM CDT.

   * PRIMARY THREATS INCLUDE...
     A FEW VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE
     A FEW DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55
   STATUTE MILES EITHER SIDE OF A LINE FROM 20 MILES SOUTHWEST OF
   CEDAR RAPIDS IOWA TO 40 MILES NORTHEAST OF MARSEILLES ILLINOIS. 
   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 333...

   DISCUSSION...MOST FAVORABLE INFLOW OF MOIST POTENTIALLY UNSTABLE AIR
   REMAINS ON THE SOUTHERN FLANK OF THE WEAKENING MESOSCALE CONVECTIVE
   SYSTEM NOW ADVANCING EASTWARD AND SOUTHWARD ACROSS PARTS OF THE
   UPPER MIDWEST.  AS THE SUPPORTING MID-LEVEL SHORT WAVE IMPULSE
   CONTINUES EASTWARD INTO A MORE STABLE ENVIRONMENT ACROSS THE GREAT
   LAKES REGION...SIGNIFICANT RE-INTENSIFICATION OF STORMS CURRENTLY
   APPEARS UNLIKELY.  BUT THE RISK FOR SEVERE WIND GUSTS AND HAIL MAY
   BE SLOW TO DIMINISH WITH STORMS SPREADING SOUTHWARD ACROSS EASTERN
   IOWA AND NORTHERN ILLINOIS.

   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 32040.


   ...KERR
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