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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, November 21, 2021

SPC Nov 21, 2021 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0321 AM CST Sun Nov 21 2021 Valid 241200Z - 291200Z ...DISCUSSION... Medium-range guidance is in good agreement that expansive upper troughing will be in place across the western and central CONUS early D4/Wednesday. Several shortwave troughs are forecast to move within this parent upper trough as it gradually moves eastward. Guidance has trended towards a more split-flow solution, with a more progressive shortwave trough moving through the northern stream across the Upper Midwest/Upper Great Lakes on D5/Thursday. At the same time, a closed cyclone is forecast to develop off the coast of the Baja Peninsula. A surface low associated with the progressive northern-stream shortwave trough will move eastward just ahead of it while an attendant cold front sweeps southeastward across much of the Plains on D4/Wednesday and through the remainder of the southern Plains and the MS and OH Valleys on D5/Thursday. Thunderstorms are possible in the vicinity of this front as it moves across OK and TX, modest buoyancy and displacement south/east of the stronger flow should limit severe-storm chances. Read more LIVE: spc.noaa.gov
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