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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.

Monday, December 6, 2021

SPC Dec 6, 2021 1730 UTC Day 2 Convective Outlook

SPC 1730Z Day 2 Outlook Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1106 AM CST Mon Dec 06 2021 Valid 071200Z - 081200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast across the contiguous United States on Tuesday. ...Synopsis... Broadly cyclonic flow aloft will be in place across much of the CONUS early Tuesday morning, with several shortwave troughs progressing through both the northern and southern streams. Some trend towards confluence of the separate streams is expected to occur across the eastern CONUS late in the period. Notable separation in streams will remain across the western CONUS, as an upper low develops off the southern CA coast and a fast-moving shortwave trough moves across the Pacific Northwest/British Columbia. At the surface, high pressure will cover much of the eastern CONUS by early Tuesday morning. This post-frontal high pressure will result in predominantly stable conditions throughout most of the period. The only exception will be within the broad warm-air advection that occurs ahead of shortwave trough moving across the TN Valley late Tuesday night/early Wednesday morning. As a shortwave progress eastward, showers and a few isolated thunderstorms may develop across the Southeast. Most of this activity will be too shallow to produce lightning, but a few embedded lightning flashes are possible with any deeper cores. ..Mosier.. 12/06/2021 Read more LIVE: spc.noaa.gov
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