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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, July 18, 2021

SPC Jul 18, 2021 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0356 AM CDT Sun Jul 18 2021 Valid 211200Z - 261200Z ...DISCUSSION... Medium-range guidance is in good agreement that upper ridging will persist across the western CONUS through at least the middle of next week. Thereafter, the upper ridge is then expected to dampen as a shortwave trough progresses through its northern periphery. Some severe may occur as this shortwave moves through the Upper MS Valley/Upper Great Lakes, but uncertainty exists regarding the speed and strength of the wave as well as how buoyant the air mass will be. Modest troughing may also persist across eastern Canada, the Upper Great Lakes, and the Northeast, reinforced by shortwave troughs rotating through its base every few days. Even so, stronger mid-level flow accompanying the shortwave troughs moving through the base of the upper trough may encounter enough low-level moisture to support organized storms. However, predictability of the timing of these shortwaves is low, as is the predictability of how buoyant the air mass will be as the shortwaves move through. Overall, predictability is too low to outlook any areas, but it does look like some potential for severe may materialize across the Upper Midwest/Upper Great Lakes and Northeast during the second half of next week. Read more LIVE: spc.noaa.gov
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