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Weather conditions directly above are near Lakefront. Top tabs refer to O'Hare (official).

Archives for the SPC Convective Outlook are updated daily (approximately) with a live map at the beginning of each article. Follow the link at the end of the article to check for current updates on the NOAA/NWS Storm Prediction Center website. Also, see Archives for Chicago's hourly weather data on CARDINAL NEWS Magazine.

Friday, August 26, 2022

SPC Aug 27, 2022 0100 UTC Day 1 Convective Outlook

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0736 PM CDT Fri Aug 26 2022 Valid 270100Z - 271200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR PARTS OF THE WESTERN DAKOTAS...SOUTHEAST MONTANA...AND NORTHEAST WYOMING THIS EVENING... ...SUMMARY... Isolated severe thunderstorms are possible across parts of the western Dakotas and southeast Montana and northeast Wyoming this evening. ...Synopsis... Water-vapor imagery this evening shows a mid-level shortwave trough progressing east along the MT/Canadian border. A convectively augmented mid-level shortwave trough/MCV is moving east-northeast across the eastern Dakotas and moving into northwest MN later tonight. Farther east, a mid-level trough will continue moving east across the Northeast and southeast Canada through tonight. In the low levels, a front will move east clearing much of the Northeast coastline by early Saturday morning. An ill-defined surface pattern exists across the north-central U.S. Going forward this evening into tonight, widely scattered storms this evening in the vicinity of the Black Hills will likely continue to pose an isolated risk for large hail/severe gusts through the late evening. Steep low- to mid-level lapse rates and adequate 50-kt westerly 8-km flow (per KUDX VAD) will support some storm organization. As the boundary layer cools this evening, a gradual lessening of instability and storm intensity is expected before the severe risk diminishes tonight. Elsewhere, general thunderstorms over parts of the Appalachians and Interior West will lessen in coverage through the evening. ..Smith.. 08/27/2022 Read more CHECK UPDATE ZOOM GRAPHIC
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