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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.

Saturday, November 27, 2021

SPC Nov 27, 2021 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0250 AM CST Sat Nov 27 2021 Valid 301200Z - 051200Z ...DISCUSSION... It appears that mid/upper flow across North America may de-amplify by the middle of next week, in the wake of a deep cyclone migrating north-northeast of the Canadian Maritimes. However, guidance suggests that the mean pattern may remain at least broadly cyclonic east of the Mississippi Valley into the Atlantic, downstream of broad ridging across the eastern mid-latitude Pacific into the Rockies and Great Plains. As a weaker belt of westerlies also lingers from the subtropical eastern Pacific through the Gulf of Mexico and Florida Peninsula, a generally confluent mid-level regime may maintain potentially cold surface high pressure across much of the Gulf Coast and Southeast, inhibiting boundary-layer moistening over the Gulf of Mexico and substantive inland moisture return. Even if significant renewed amplification within the westerlies were to take place east of the Mississippi Valley into the Atlantic Seaboard late this week into next weekend, as at least some model output has indicated, it is not clear that low-level moistening off the Gulf of Mexico and/or western Atlantic will be sufficient to support an appreciable risk of severe weather by that time. Read more LIVE: spc.noaa.gov