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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, August 21, 2021

SPC Aug 21, 2021 0730 UTC Day 3 Severe Thunderstorm Outlook

SPC 0730Z Day 3 Outlook Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0216 AM CDT Sat Aug 21 2021 Valid 231200Z - 241200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe risk appears low across the U.S. for Monday.. ...Discussion... As tropical system Henri weakens Monday across New England, and broad ridging prevails across the southern half of the country, little potential for any appreciable severe potential is indicated at this time. Meanwhile in the West, troughing will advance across the Intermountain region, on the southern fringe of a closed low progged to move from southern British Columbia to southern Saskatchewan through the period. Accompanying this system, a cold front will also move across the West, and should emerge into the northern Plains overnight. The low-level airmass ahead of this system is progged to remain moisture-starved, and thus convection largely weak. A very deep surface-based mixed layer is expected ahead of the front across the eastern Montana vicinity during the afternoon and evening, and so a stronger gust or two with isolated/high-based convection could occur. However, as any lingering convection moves eastward into North Dakota overnight, boundary-layer cooling should further limit any potential for strong/gusty outflow winds at the surface. ..Goss.. 08/21/2021 Read more LIVE: spc.noaa.gov