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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.

Friday, July 2, 2021

SPC Jul 2, 2021 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0329 AM CDT Fri Jul 02 2021 Valid 051200Z - 101200Z ...DISCUSSION... Medium-range guidance is fairly consistent in maintaining a generally low-amplitude, weak flow upper-level pattern for much of the Day 4-8 period. A weak shortwave trough will migrate across the Upper Midwest/Great Lakes vicinity on Day 5/Tue. An associated surface front will drop southward across parts of the Mid-MO/Upper MS Valley and become a focus for thunderstorm development. However, poor vertical shear and midlevel lapse rates will likely limit organized severe thunderstorm potential. A stronger upper shortwave trough is forecast to develop east/southeast across the northern Plains and Upper Midwest around Day 8/Fri. Stronger west/northwesterly deep-layer flow is expected with this system as a deepening surface low develops and sweeps a cold front across the region. Increasing severe potential could accompany this system and probabilities may be needed in subsequent outlooks if forecast trends are maintained. Read more LIVE: spc.noaa.gov
http://dlvr.it/S2w7G0