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Weather conditions on bar directly above are near Lakefront. Tabs under Moon Phases refer to O'Hare (official).

Archives for SPC Convective outlook are updated daily with a live map a the beginning of the article. Touch or click map to get possible update, and follow link at end of article for referral to NOAA/NWS Storm Prediction Center. Archives for Chicago's hourly weather data were updated 24-48 hours after end of each day prior to Dec. 2020.

Wednesday, July 28, 2021

SPC Jul 29, 2021 0100 UTC Day 1 Convective Outlook

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0804 PM CDT Wed Jul 28 2021 Valid 290100Z - 291200Z ...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS OVER A PORTION OF THE UPPER MIDWEST AND GREAT LAKES REGION... ...SUMMARY... Widespread severe storms with occasional significant severe wind damage are expected this evening into tonight along a corridor from northeastern Minnesota across Wisconsin to southwest Lower Michigan. ...Upper Midwest and Great Lakes region... As of early evening, robust surface-based thunderstorm initiation is underway in several areas across the Upper Midwest including along a cold front over northeast MN as well as along a pre-frontal boundary across northwest WI. Storms are expected to increase in coverage this evening over northern WI in response to an strengthening southwesterly low-level jet coupled with a low-amplitude shortwave trough moving southeast along the northern periphery of an upper ridge. Some of the initial storms may exhibit supercell characteristics given 45+ kt effective bulk shear and 3000+ J/kg MLCAPE. Very large hail and isolated tornadoes are possible mainly through mid-evening. However, storms should eventually congeal into a forward-propagating MCS with line/bowing segments and spread southeast along the instability gradient. Widespread damaging wind (some significant) and possibly a few QLCS tornadoes should become the main threats later this evening into the overnight. ..Dial.. 07/29/2021 Read more LIVE: spc.noaa.gov