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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.

Saturday, September 4, 2021

SPC Sep 5, 2021 0100 UTC Day 1 Convective Outlook

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0756 PM CDT Sat Sep 04 2021 Valid 050100Z - 051200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS SANDHILLS OF NEBRASKA... ...SUMMARY... A localized risk for hail may accompany a thunderstorm or two in central Nebraska during the overnight. ...Synopsis... A cold front will continue to progress southeast across OK and the Ozarks region this evening. Widely scattered thunderstorms near the front will progress east-southeast within a moist boundary layer. Although a strong gust may occur with a couple of the stronger cores, the gradual reduction in buoyancy due to the loss of heating will lead to storms diminishing in coverage/intensity by later this evening. Farther north over NE, isolated thunderstorms are forecast late tonight as a mid-level shortwave trough --evident this evening in water vapor imagery over northern WY-- moves into the north-central Great Plains. Strengthening large-scale ascent and steep mid-level lapse rates will favor storms developing primarily after 09z. A localized risk for large hail may occur with the strongest updrafts. ..Smith.. 09/05/2021 Read more LIVE: spc.noaa.gov
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