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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.

Thursday, December 23, 2021

SPC Dec 23, 2021 1630 UTC Day 1 Convective Outlook

SPC 1630Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1024 AM CST Thu Dec 23 2021 Valid 231630Z - 241200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS THE SACRAMENTO VALLEY... ...SUMMARY... A brief/weak tornado and small hail are possible in a portion of the Sacramento Valley late this afternoon. ...Sacramento Valley... Ahead of the offshore upper trough that will reach SoCal early Friday, warm conveyor-related steady precipitation ongoing across north-central California early today will gradually shift southward, with more scattered low-topped convection expected to develop across northern California coincident with some cloud breaks later today. By late afternoon, low/mid-level lapse rates are expected to modestly steepen with the potential development of a couple hundred J/kg SBCAPE. That may coincide with a backing or persistence of south/southeasterly surface winds in the interior valley with a related modest increase in low-level hodograph curvature. This scenario could support a weak supercell or two late this afternoon, with the possibility of a brief/weak tornado and small hail. ..Guyer.. 12/23/2021 Read more LIVE: spc.noaa.gov
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