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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 25, 2021

SPC Dec 25, 2021 0830 UTC Day 3 Severe Thunderstorm Outlook

SPC 0830Z Day 3 Outlook Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0147 AM CST Sat Dec 25 2021 Valid 271200Z - 281200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms will be possible along the California Coast and from eastern Oklahoma into the Ohio Valley. ...Synopsis... An upper-level trough is forecast to move from somewhere near the California Coast Monday morning to the southern High Plains by Tuesday morning. As this trough crosses the Rockies, expect strong lee cyclogenesis in eastern Colorado early Tuesday morning. A warm front is forecast to extend from the surface low across northern Oklahoma/southern Kansas and into the Tennessee Valley. ...Eastern Plains into the Ohio Valley... Significant mass response is expected across the southern Plains as a result of the upper-level shortwave trough and associated strong jet streak approaching the region. This will result in a strengthening low-level jet across much of the Plains and increasing isentropic ascent north of the warm front between 06Z and 12Z Tuesday. The strengthening low-level jet will also bring Gulf moisture northward which is expected to result in some buoyancy to support thunderstorms. While sufficient for thunderstorms, the moisture will likely not be great enough to support greater instability necessary for a severe weather threat. ..Bentley.. 12/25/2021 Read more LIVE: spc.noaa.gov
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