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Severe Thunderstorm Watch 487
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WW0487 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
Severe Hail 2"+ Hail
Low 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 487
   NWS Storm Prediction Center Norman OK
   400 AM CDT Sat Jul 23 2022

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Northern Illinois
     Extreme northwestern Indiana
     Extreme southern Wisconsin
     Lake Michigan

   * Effective this Saturday morning from 400 AM until 1000 AM CDT.

   * Primary threats include...
     Scattered damaging wind gusts to 70 mph possible
     Isolated large hail events to 1.5 inches in diameter possible

   SUMMARY...An increasingly organized cluster of thunderstorms moving
   into northwestern IL, the northern gust front of which produced a
   measured 54-kt gust at DBQ, is expanding and moving into a favorably
   moist/unstable airmass west of a separate convective cluster along
   the southwest shore of Lake Michigan.  The western complex may
   continue to pose a severe-gust threat as it crosses the watch area
   this morning.

   The severe thunderstorm watch area is approximately along and 45
   statute miles north and south of a line from 60 miles west of
   Rockford IL to 70 miles east of Rockford IL. 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.

   &&

   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
   27035.

   ...Edwards
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Page last modified: July 23, 2022
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