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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.

Friday, December 24, 2021

SPC Dec 24, 2021 1630 UTC Day 1 Convective Outlook

SPC 1630Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1014 AM CST Fri Dec 24 2021 Valid 241630Z - 251200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible over parts of the Pacific Coast States, eastern Great Basin and Colorado Plateau. ...Western States... Morning water vapor imagery shows two strong shortwave troughs affecting the western US today. One system is currently moving ashore over southern CA, and has produced scattered lightning flashes during the past few hours offshore and just inland. Radar and IR satellite imagery suggest that the main lift associated with this feature is beginning to shift eastward, with the prospects for more lightning over southern CA waning rapidly. Have therefore removed that thunderstorm area with anticipated coverage now below 10%. This same system will move eastward and result in isolated thunderstorms today over the southern Sierras, and from northwest AZ into parts of UT/CO. A second shortwave trough is approaching the WA/OR coast. Isolated thunderstorms are expected to occur along the coast through the afternoon, with lesser chances farther inland into parts of ID. Present indications are that the eastern areas will see minimal coverage of flashes, so have opted to leave those areas below 10% threshold. ..Hart/Squitieri.. 12/24/2021 Read more LIVE: spc.noaa.gov
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