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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.

Tuesday, January 4, 2022

SPC Jan 4, 2022 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0308 AM CST Tue Jan 04 2022 Valid 071200Z - 121200Z ...DISCUSSION... A large upper trough is expected to be over the eastern CONUS on Friday/D4, and is forecast to move out of the Northeast on Saturday/D5. An associated area of high pressure will move from the MS Valley to the Mid Atlantic during the same period, with low-level moisture return occurring late Saturday/D5 into Sunday/D6 across the Southeast as a positive-tilt upper trough moves from the Four Corners area across the southern Plains. At least a low-end severe threat may develop around Sunday/D7 across the lower MS Valley as mid to upper 60s F dewpoints spread north ahead of a cold front. At this time, it appears the positive-tilt nature of the upper trough and the fast/potentially undercutting nature of the cold front will preclude any significant severe potential. However, front-parallel winds aloft and MUCAPE of 500-1000 J/kg may support some damaging wind potential. The aforementioned shortwave trough will then become absorbed into a larger-scale upper trough which is forecast to amplify across much of the Great Lakes and Northeast, with high pressure rapidly stabilizing much the eastern half of the CONUS. Read more LIVE: spc.noaa.gov
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