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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.

Sunday, December 12, 2021

SPC Dec 12, 2021 1630 UTC Day 1 Convective Outlook

SPC 1630Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1026 AM CST Sun Dec 12 2021 Valid 121630Z - 131200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few thunderstorms will be possible across the coastal Pacific Northwest through tonight. ...Synopsis... A deep midlevel trough and associated cold air aloft/steep lapse rates, as evidenced by the large area of low-topped convection west of the WA/OR coasts, will spread slowly inland and southward through the outlook period. Weak buoyancy will be possible close to the coast in this flow regime, where isolated lightning flashes will be possible through the period with convective cells spreading inland. Otherwise, low-level moisture will linger along and south of a baroclinic zone drifting into central FL. Some shallow convection is expected along the front and along a separate pre-frontal band across southeast FL, but a pronounced stable layer near 700 mb suggests that convection deep enough to produce lightning is unlikely. ..Thompson.. 12/12/2021 Read more LIVE: spc.noaa.gov
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