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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.

Thursday, September 23, 2021

SPC Sep 23, 2021 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0237 AM CDT Thu Sep 23 2021 Valid 261200Z - 011200Z ...DISCUSSION... General model trends in the 4-8 period have been for a blocking upper pattern to evolve. Low-level moisture will remain very limited day 4 (Sunday). By later day 5, a slow-moving southern-stream cutoff upper low may reach the southern High Plains with Gulf moisture returning to TX by day 6. However, winds aloft and vertical shear accompanying the closed upper low will remain relatively weak. While predictability decreases by days 7-8, some models (including the ECMWF) suggest an Omega block will persist in some form across the U.S., which will result in limited severe potential. Read more LIVE: spc.noaa.gov
http://dlvr.it/S8734T