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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 0600 UTC Day 1 Convective Outlook

SPC 1200Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1129 PM CST Fri Nov 26 2021 Valid 271200Z - 281200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not forecast across the contiguous United States on Saturday. ...Discussion... Gradual amplification of the upper flow pattern over the U.S. is expected today, as short-wave troughing progressing southeastward across the Canadian Priairie provinces and northern/central Plains states eventually begins phasing with a southern-stream trough crossing the south-central states. The eventual result will be a broad trough over the East, and upstream ridging over the West. At the surface, a weak low/front will shift out of the Plains and across the mid and lower MS/OH/TN valleys with time, while high pressure prevails elsewhere. With a continental airmass largely in place over the U.S., little potential for thunderstorms is evident. The lone exception could be across the Texas vicinity, where a few sporadic lightning flashes could occur with weak/elevated convection, within an area of QG-forced precipitation associated with the aforementioned upper short-wave trough. However, coverage appears likely to remain sparse, precluding inclusion of the 10% area. ..Goss/Elliott.. 11/27/2021 Read more LIVE: spc.noaa.gov
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