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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, December 11, 2021

SPC Dec 11, 2021 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0245 AM CST Sat Dec 11 2021 Valid 141200Z - 191200Z ...DISCUSSION... ...Tuesday/Day 4 to Thursday/Day 6... The medium-range models move an upper-level trough quickly northeastward from the coast of California on Tuesday to the Great Lakes region on Thursday. Thunderstorms will be possible Wednesday as the trough moves into the central Plains. Although an isolated severe threat could develop in parts of the mid Missouri Valley Wednesday afternoon, instability is forecast to remain weak. This should keep any severe threat marginal. As the trough moves into the Great Lakes region on Thursday, thunderstorm development will be possible along a cold front from the Ohio Valley southwestward into the mid Mississippi Valley. Instability is again forecast to be weak along the front suggesting any potential for organized thunderstorms will remain minimal. ...Friday/Day 7 and Saturday/Day 8... On Friday and Saturday, the models maintain west-southwesterly mid-level flow across the central and eastern United States and keep a moist airmass in place across the Gulf Coast region. Isolated to scattered thunderstorm development will be possible each day along the northern edge of this moist airmass from north Texas eastward into the lower Mississippi Valley and central Gulf Coast states. Instability is forecast to be weak along this corridor both on Friday and Saturday afternoon suggesting any severe threat will remain marginal. Read more LIVE: spc.noaa.gov
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