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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.

Sunday, December 12, 2021

SPC Dec 12, 2021 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0251 AM CST Sun Dec 12 2021 Valid 151200Z - 201200Z ...DISCUSSION... ...Wednesday/Day 4 to Friday/Day 6... An upper-level trough will move quickly northeastward across the central Plains on Wednesday. Thunderstorm development is expected during the afternoon and evening along an associated cold front from eastern Nebraska into southern Minnesota. Instability should be weak keeping any severe threat isolated. On Thursday, another upper-level trough is forecast to move into the Great Lakes region as the cold front advances southeastward into the Ohio and mid Mississippi Valleys. Thunderstorm development should take place along the front during the afternoon and evening. Instability should again be weak suggesting any unconditional severe threat should be isolated. For Friday, an upper-level trough is forecast to move across the north-central U.S. with west to southwest mid-level flow located in the southern and eastern U.S. A moist airmass is forecast to remain in place across the eastern southern Plains and lower Mississippi Valley, where isolated thunderstorm development will be possible Friday afternoon and evening. Again, weak instability should keep any potential for severe thunderstorm activity on the low side. ...Saturday/Day 7 and Sunday/Day 8... On Saturday and Sunday, a cold front is forecast to advance slowly southeastward across the eastern Gulf Coast states and Georgia as an upper-level trough moves across the Ohio and Tennessee Valleys. Thunderstorm development could occur each afternoon along parts of the cold front from Alabama northeastward into the Carolinas. But instability should remain weak minimizing any potential severe threat. Read more LIVE: spc.noaa.gov
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