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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, September 26, 2021

SPC Sep 26, 2021 0100 UTC Day 1 Convective Outlook

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0730 PM CDT Sat Sep 25 2021 Valid 260100Z - 261200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected tonight. ...01z Update... Upper low off the northern Baja Peninsula will begin to eject slowly east later tonight. Greatest buoyancy ahead of this feature currently extends across northern Mexico into southeast AZ/southwest NM where 300-500 J/kg MLCAPE is noted at TUS/EPZ. With large-scale forcing for ascent not expected to be that significant north of the international border overnight, boundary-layer cooling should result in gradual weakening of ongoing convection. While brief gusty winds, or perhaps small hail, could be noted with the strongest updrafts for the next hour or so, severe threat appears low tonight. Elsewhere, weak convection is expected beneath the upper trough from northern Lake MI toward Lake ON. Some of this lake convection could generate a few lightning flashes. Later tonight, a few elevated thunderstorms could evolve over portions of New England in response to the approaching upper trough. ..Darrow.. 09/26/2021 Read more LIVE: spc.noaa.gov
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