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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, November 26, 2021

SPC Nov 26, 2021 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0230 AM CST Fri Nov 26 2021 Valid 291200Z - 041200Z ...DISCUSSION... A weak belt of high-level westerlies may persist from the subtropical eastern Pacific through the Gulf of Mexico and Florida Peninsula vicinity through this period. However, models suggest that a belt of mid/upper westerlies emanating from the mid-latitude Pacific will remain much more prominent. Within this regime, it appears that broad mid-level ridging will persist across the northern Pacific coast into much of the northern Great Plains, while downstream troughing only gradually loses amplitude and broadens across the eastern U.S. into western Atlantic. Beneath resultant confluent mid/upper flow between the two regimes, cold surface high pressure appears likely to maintain relatively dry and stable conditions across much of the Gulf Coast states/Southeast and Gulf of Mexico into the middle to latter portion of next week. Thereafter, models indicate that there may be substantive amplification of troughing within the mid-latitude westerlies across the Mississippi Valley vicinity by late next week. While this probably will be accompanied by the development of southerly or southwesterly return flow off the Gulf of Mexico, low-level moistening supportive of appreciable severe thunderstorm potential seems unlikely through at least next Friday (December 3rd). Read more LIVE: spc.noaa.gov