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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).

Wednesday, July 21, 2021

SPC Jul 21, 2021 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0347 AM CDT Wed Jul 21 2021 Valid 241200Z - 291200Z ...DISCUSSION... Recent medium-range guidance is in good agreement that upper ridging will persist across the 2/3rds of CONUS throughout the extended period into at least the middle of next week. Weak flow aloft will accompany this ridging, resulting in limited potential for severe storms across the majority of the CONUS. A belt of westerly flow is expected to remain in place around the northern periphery of the upper ridge, extending from the Pacific Northwest through the Great Lakes and Northeast. A series of shortwave troughs will likely progress through this westerly flow, resulting in at least some potential for severe thunderstorms if enough low-level moisture precedes the shortwaves. Low predictability precludes introducing any severe probabilities with this outlook, but some elevated severe potential currently appears to be across the Upper Great Lakes on D4/Saturday, and the Northeast on D5/Sunday. Read more LIVE: spc.noaa.gov