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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.

Tuesday, September 21, 2021

SPC Sep 21, 2021 0100 UTC Day 1 Convective Outlook

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0753 PM CDT Mon Sep 20 2021 Valid 210100Z - 211200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM CENTRAL WISCONSIN SOUTH-SOUTHWESTWARD TO CENTRAL MISSOURI... ...SUMMARY... A couple of severe thunderstorms -- capable of producing locally damaging wind gusts and hail -- will continue through mid evening across parts of the Upper Mississippi Valley southward to central Missouri. ...Discussion... A semi-continuous line of thunderstorms is ongoing at this time from western Lake Superior south-southwestward to far southeastern Kansas, near the advancing cold front. While this band of storms is expected to continue through the overnight hours, limited instability -- diminishing gradually with the loss of daytime heating -- is indicated across most of the region. As such, severe-weather potential is also expected to continue to gradually wane through the evening hours. In the mean time however, will maintain a narrow corridor of SLGT risk, from central Wisconsin to central Missouri, to reflect the zone of greatest potential for damaging winds and/or hail. ..Goss.. 09/21/2021 Read more LIVE: spc.noaa.gov