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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.

Monday, September 13, 2021

SPC Sep 13, 2021 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0314 AM CDT Mon Sep 13 2021 Valid 161200Z - 211200Z ...DISCUSSION... Low-level moisture return should occur across portions of the northern Plains and Upper Midwest on Day 4/Thursday ahead of an upper trough/low moving eastward across central Canada and the north-central CONUS. There may be some potential for surface-based storms posing an isolated severe risk ahead of a cold front, mainly Thursday evening/night over parts of the Upper Midwest. However, there remains too much uncertainty regarding the quality of low-level moisture return and overall storm coverage to include a 15% severe area at this time. Any organized severe potential becomes less clear late this week into the upcoming weekend, as a fairly zonal upper pattern is forecast across much of the central/eastern CONUS. There are some indications that another upper trough may develop across parts of the northwestern/north-central CONUS around Day 7/Sunday or Day 8/Monday, but predictability remains low. Read more LIVE: spc.noaa.gov
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