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Severe Thunderstorm Watch 345
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WW0345 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.
   SEL5

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 345
   NWS Storm Prediction Center Norman OK
   540 PM CDT Sat Jun 17 2017

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Southern and eastern Iowa
     Northern and central Illinois
     Northeast Missouri
     Lake Michigan

   * Effective this Saturday afternoon and Sunday morning from 540
     PM until 100 AM CDT.

   * Primary threats include...
     Scattered large hail and isolated very large hail events to 2.5
       inches in diameter possible
     Scattered damaging wind gusts to 70 mph possible
     A tornado or two possible

   SUMMARY...Storms will continue to intensify generally near a front
   where the preceding air mass is most and very unstable. With the aid
   of an approaching mid/upper-level system and jet streak, relatively
   strong deep-layer winds will help organize storms into
   east/southeastward-moving bands through the evening. Damaging winds
   and severe hail are the primary concerns.

   The severe thunderstorm watch area is approximately along and 60
   statute miles north and south of a line from 65 miles west northwest
   of Quincy IL to 45 miles east of Marseilles IL. For a complete
   depiction of the watch see the associated watch outline update
   (WOUS64 KWNS WOU5).

   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.

   &&

   AVIATION...A few severe thunderstorms with hail surface and aloft to
   2.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
   few cumulonimbi with maximum tops to 600. Mean storm motion vector
   28035.

   ...Guyer
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Page last modified: June 18, 2017
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