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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.

Wednesday, December 15, 2021

SPC Dec 15, 2021 0830 UTC Day 3 Severe Thunderstorm Outlook

SPC 0830Z Day 3 Outlook Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0207 AM CST Wed Dec 15 2021 Valid 171200Z - 181200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated to scattered thunderstorm development will be possible from parts of the southern Plains into the mid Mississippi on Friday. A few storms may also occur across the southern Florida Peninsula. No severe threat is expected Friday or Friday night. ...DISCUSSION... An upper-level trough will move across the central and northern High Plains on Friday as west-southwest mid-level flow remains established from the southern Plains to the Eastern Seaboard. A quasi-stationary front will be in place from north Texas east-northeastward into the mid Mississippi Valley. Near and to the south of the front, surface dewpoints are forecast to be in the lower 60s F yielding weak instability by afternoon. Thunderstorm development will be possible near the front in the late afternoon. Convective coverage is expected to increase during the early evening as low-level flow strengthens. The instability could be enough to support a few strong wind gusts but there is too much spatial uncertainty to introduce a marginal risk at this time. ..Broyles.. 12/15/2021 Read more LIVE: spc.noaa.gov
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