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Archives for Chicago's hourly weather data updated 24-48 hours after end of each day. MOBILE CHGOWX.COM ...
Weather conditions on bar directly above are near Lakefront. Weather conditions with Moon are O'Hare (official).

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
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