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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, September 27, 2021

SPC Sep 27, 2021 0730 UTC Day 3 Severe Thunderstorm Outlook

SPC 0730Z Day 3 Outlook Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0201 AM CDT Mon Sep 27 2021 Valid 291200Z - 301200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected on Wednesday. ...Synopsis... A closed upper low within a larger-scale trough will migrate southward across New England on Wednesday. Meanwhile, an upper ridge will become centered over the MS Valley while a broad upper trough overspreads the western half of the CONUS. Deep-layer southerly flow will result in northward transport of Gulf moisture across the Plains. A surface cold front is forecast to shift east across the northern/central Plains through the period. Quality of boundary-layer moisture will decrease with northward extent, but a narrow corridor of surface dewpoints in the low 60s should materialize as far north as eastern NE/SD ahead of the front. This will support weak destabilization through peak heating, and isolated strong storms could develop. However, deep southerly flow parallel to the surface boundary may tend to favor training precipitation that becomes undercut by the front. As a result, overall severe potential appears too low to include probabilities at this time. ..Leitman.. 09/27/2021 Read more LIVE: spc.noaa.gov