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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).

Tuesday, July 20, 2021

SPC Jul 20, 2021 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0349 AM CDT Tue Jul 20 2021 Valid 231200Z - 281200Z ...DISCUSSION... Recent medium-range guidance is in good agreement that the upper ridging that is expected to build across the southern third of CONUS early this week will persist through the weekend and into next week. Weak flow aloft will accompany this ridging, resulting in limited potential for severe storms. At the same time, 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. Predictability is too low to introduce any outlook areas but the elevated severe potential currently appears to be across the northern Plains on D4/Friday, Upper Great Lakes on D5/Saturday, and the Northeast on D6/Sunday. Read more LIVE: spc.noaa.gov