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Archives for Chicago's hourly weather data updated 24-48 hours after end of each day. MOBILE CHGOWX.COM ...
Weather conditions on bar directly above are near Lakefront. Weather conditions with Moon are O'Hare (official).

Monday, September 20, 2021

SPC Sep 20, 2021 0100 UTC Day 1 Convective Outlook

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0758 PM CDT Sun Sep 19 2021 Valid 200100Z - 201200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE NORTH-CENTRAL U.S.... ...SUMMARY... Isolated severe thunderstorms are possible mainly across parts of the eastern Dakotas and northwest Minnesota through tonight. ...Discussion... Convection has increased in coverage/intensity over the past 1 to 2 hours across northern Minnesota, ahead of the advancing cold front, and across the high Plains of eastern Wyoming and into adjacent western South Dakota and the Nebraska Panhandle. A few storms have also developed over portions of central Nebraska, near a weak surface trough. As the upper trough -- and in tandem, the surface front -- continues to advance eastward tonight, further increases in convection will occur. As high-based storms spread eastward toward the central Dakotas, sub-cloud evaporation may contribute to gusty winds, with gusts possibly reaching severe levels in a few areas. Meanwhile, increasing convection near the aforementioned surface boundaries may also intensify locally to severe levels, with gusty winds and marginal hail possible with a stronger storm or two. However, overall risk should remain limited in coverage and marginal in nature, hence continuation of the MRGL risk across this region. ..Goss.. 09/20/2021 Read more LIVE: spc.noaa.gov
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