WW 487 SEVERE TSTM IL IN WI LM 230900Z – 231500Z
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
