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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 20, 2021

SPC Dec 20, 2021 0830 UTC Day 3 Severe Thunderstorm Outlook

SPC 0830Z Day 3 Outlook Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0227 AM CST Mon Dec 20 2021 Valid 221200Z - 231200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated general thunderstorms are possible along a portion of the West Coast into interior northern California, mainly Wednesday evening and night. ...West Coast and northern CA... In the wake of a lead shortwave impulse shifting east from the Northwest to the northern Rockies, a more amplified trough will approach the Pacific Northwest coast by 12Z/Thu. In response, onshore flow will be maintained but more importantly strengthen, especially during the latter half of the period. While buoyancy will likely remain scant with surface dew points peaking in the mid to upper 40s, steep low to mid-level lapse rates and increasing large-scale ascent may prove sufficient for sporadic lightning production along the immediate coast. A low-probability thunder threat may spread into interior northern CA as well, mainly on Wednesday night. ..Grams.. 12/20/2021 Read more LIVE: spc.noaa.gov
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