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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 1730 UTC Day 2 Convective Outlook

SPC 1730Z Day 2 Outlook Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1103 AM CST Sat Nov 27 2021 Valid 281200Z - 291200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorm chances will remain negligible on Sunday. ...Synopsis... An amplified upper ridge will encompass the western half of the CONUS while a large scale upper trough pivots across the eastern half. An embedded upper low/shortwave trough will shift east/southeast across the Great Lakes vicinity, bringing a strong jet streak across the upper Ohio Valley during the late afternoon/evening. Cold temperatures aloft with steep lapse rates from near the surface through 700 mb will be in place, and shallow convection with lake-effect snow bands is possible downstream from a relatively warm Lake Erie. While a lightning flash could occur, coverage will be less than 10% as instability will remain less than 100 J/kg MLCAPE through a shallow -15 C to -20 C layer. Elsewhere across the country, dry and stable conditions will preclude thunderstorm activity. ..Leitman.. 11/27/2021 Read more LIVE: spc.noaa.gov
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