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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).

Sunday, August 22, 2021

SPC Aug 22, 2021 0730 UTC Day 3 Severe Thunderstorm Outlook

SPC 0730Z Day 3 Outlook Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0222 AM CDT Sun Aug 22 2021 Valid 241200Z - 251200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE MID MISSOURI AND UPPER MISSISSIPPI VALLEYS... ...SUMMARY... A few severe storms will be possible from the Mid Missouri Valley to the Upper Mississippi Valley Tuesday. ...Synopsis... Large-scale ridging will become further entrenched across the southern half to two-thirds of the U.S. Tuesday, as height rises spread gradually northward with time. At the surface, a cold front -- advancing eastward in tandem with a south-central Canada/northern U.S. upper short-wave trough -- will traverse the northern and central Plains through the period. This front will focus afternoon and evening convective activity. ...Eastern Nebraska/southeastern South Dakota into the Upper Mississippi Valley area... As a cold front advances eastward across the northern Plains, diurnal heating of a moist warm sector will result in moderate destabilization. This will support afternoon development of scattered showers and thunderstorms, from the eastern Dakotas and western Minnesota southwestward into Nebraska. With a belt of 40 kt west-southwesterly mid-level flow forecast atop this area, on the southeastern fringe of the upper system, shear sufficient for a few storms to organize/become severe is evident. As such, MRGL risk is being introduced, for all-hazards severe potential, but which may remain sparse in coverage due to rather weak large-scale forcing. As evolution becomes a bit more clear in future updates, SLGT risk upgrade may become warranted. ..Goss.. 08/22/2021 Read more LIVE: spc.noaa.gov
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