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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.

Wednesday, August 11, 2021

SPC Aug 11, 2021 0730 UTC Day 3 Severe Thunderstorm Outlook

SPC 0730Z Day 3 Outlook Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0210 AM CDT Wed Aug 11 2021 Valid 131200Z - 141200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM A PORTION OF THE NORTHEAST STATES INTO THE OHIO AND MIDDLE MISSISSIPPI VALLEY REGIONS... ...SUMMARY... A few strong to severe storms with locally strong to damaging wind gusts will be possible from a portion of the Northeast States into the Ohio and middle Mississippi Valleys Friday. ...Northeast States through Ohio and middle Mississippi Valleys... The upper pattern will remain characterized by a broad synoptic trough centered over the Great Lakes region. By 12Z Friday a cold front should extend from the lower Great Lakes through northern or central IL then westward into KS. A moist boundary layer will reside in the pre-frontal warm sector from the Northeast States into the OH Valley. However, there will likely be areas of ongoing thunderstorms and widespread clouds over portions of this region. Moreover, there is considerable uncertainty where the outflow boundaries and MCVs associated any ongoing activity will situated. Nevertheless, the atmosphere should become moderately unstable where diabatic heating does occur. Additional thunderstorms will redevelop along residual outflow boundaries, lake breezes as well as along the cold front. Vertical shear in the warm sector will remain weak and supportive of multicells, but storms may evolve into lines and clusters and become capable of producing isolated strong to severe gusts from afternoon into the early evening. ..Dial.. 08/11/2021 Read more LIVE: spc.noaa.gov