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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).

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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