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Weather conditions on bar directly above are near Lakefront. Tabs under Moon Phases refer to O'Hare (official).

Archives for SPC Convective outlook are updated daily with a live map a the beginning of the article. Touch or click map to get possible update, and follow link at end of article for referral to NOAA/NWS Storm Prediction Center. Archives for Chicago's hourly weather data were updated 24-48 hours after end of each day prior to Dec. 2020.

Friday, December 10, 2021

SPC Dec 10, 2021 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0245 AM CST Fri Dec 10 2021 Valid 131200Z - 181200Z ...DISCUSSION... ...Day 4/Monday and Day 5/Tuesday... A cool, dry and stable airmass will be in place across the central and eastern United States on Monday and Tuesday. For this reason, severe thunderstorm development is not expected across the continental United States early in the week. ...Day 6/Wednesday to Day 8/Friday... On Wednesday and Thursday, a fast moving upper-level trough is forecast to move northeastward from the central Rockies to the Great Lakes region. Moisture return will take place ahead of the system from the southern Plains into the mid Missouri Valley, where surface dewpoints could reach the upper 50s to lower 60s F. Thunderstorm development will be possible along and to the west of the moist corridor Wednesday afternoon and evening. Thunderstorm development will again be possible along the moist corridor in the central Great Lakes region on Thursday. Although deep-layer shear will be strong on both days, weak instability should keep any severe potential isolated. On Friday, surface high pressure is forecast to move across the central United States. A moist airmass should be in place in the western Gulf Coast region where isolated thunderstorm development will be possible during the afternoon. Although instability should remain weak Friday afternoon, a marginal severe threat could still develop in areas that destabilize the most. At this time, model differences concerning the distribution of instability and the upper-level pattern for Friday are substantial in the southern U.S. For this reason, will go predictability too low. Read more LIVE: spc.noaa.gov