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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, June 20, 2021

SPC Jun 20, 2021 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0355 AM CDT Sun Jun 20 2021 Valid 231200Z - 281200Z ...DISCUSSION... Medium-range guidance is starting to come into better agreement regarding the synoptic-scale pattern across the CONUS from the middle to latter portion of the upcoming week. Upper ridging centered over the Rockies on Day 4/Wednesday should become suppressed through Day 6/Friday as multiple shortwave troughs evolve across south-central Canada, the northern Plains, and Midwest. Low-level moisture is still forecast to return northward ahead of these mid-level perturbations, and an EML emanating from the High Plains may advect as far east as the mid/upper MS Valley and Midwest by Day 5/Thursday. A cap may inhibit robust storm development across the Midwest on Day 4/Wednesday. Still, the severe risk should increase as both instability and shear are forecast to strengthen by Day 5/Thursday. Portions of southern MN into IA and vicinity may have the best potential for severe storms on Day 5/Thursday, but predictability regarding the timing and placement of these shortwave troughs remains too uncertain to introduce a 15% severe area. Some severe threat may continue on Day 6/Friday across parts of the Midwest and mid MS Valley ahead of a cold front, as an upper trough/low possibly amplifies and develops from the north-central CONUS towards the Great Lakes. Read more LIVE: spc.noaa.gov
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