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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, June 20, 2022

SPC Jun 20, 2022 0730 UTC Day 3 Severe Thunderstorm Outlook

SPC 0730Z Day 3 Outlook Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0212 AM CDT Mon Jun 20 2022 Valid 221200Z - 231200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS THE OHIO VALLEY AND LOWER GREAT LAKES REGION... ...SUMMARY... Isolated strong to severe thunderstorms are possible across the Ohio Valley and Lower Great Lakes region on Wednesday afternoon and evening. ...Synopsis... Expansive upper ridging covering much of the southern CONUS is forecast to be centered over the southern Plains Wednesday morning. A shortwave trough will likely be progressing through the northern periphery of this ridge, beginning the day over western Ontario and the Upper Great Lakes before continuing eastward into western Quebec and the Lower Great Lakes. ...OH Valley into the Lower Great Lakes... Progression of this shortwave will push an attendant cold front southeastward across the OH Valley and Lower Great Lakes region during the afternoon and evening. A warm and moist air mass will likely be in place ahead of this cold front, with dewpoints in the upper 60s/low 70s and temperatures reaching the 90s during the late afternoon. These thermodynamic conditions will support a very unstable air mass, and the potential for thunderstorms as the front moves through. Vertical shear throughout much of the region will be weak, limiting storm organization, but the robust buoyancy will still support robust updrafts capable of damaging wind gusts and/hail. Disorganized storm mode is currently expected to limit the coverage and persistence of any severe storms, with only isolated coverage currently anticipated. ..Mosier.. 06/20/2022 Read more CHECK UPDATE ZOOM GRAPHIC
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