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Archives for the SPC Convective Outlook are updated daily (approximately) with a live map at the beginning of each article. Follow the link at the end of the article to check for current updates on the NOAA/NWS Storm Prediction Center website. Also, see Archives for Chicago's hourly weather data on CARDINAL NEWS Magazine.


Wednesday, September 15, 2021

SPC Sep 15, 2021 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0334 AM CDT Wed Sep 15 2021 Valid 181200Z - 231200Z ...DISCUSSION... Organized severe potential across the CONUS appears low this upcoming weekend as an upper ridge moves slowly eastward from the central to eastern CONUS. Farther west, a large-scale upper trough should gradually amplify while moving eastward across the western CONUS. This upper trough is forecast to eventually eject from the Rockies across the Plains and MS Valley from the early to middle part of next week. Low-level moisture should return northward across these regions ahead of the upper trough. Some increase in organized severe potential is possible from Day 6/Monday through the end of the forecast period. However, the upper trough may evolve into a closed low while moving slowly over the Plains. If this occurs, then the stronger mid-level winds would tend to remain to the cool side of the related surface cold front, which would limit severe potential. Regardless, there is still a fair amount of uncertainty regarding the evolution of the upper trough/low early next week, suggesting low predictability. Read more LIVE:
SUNRISE AND SUNSET TIMES IN UTC (if you're not logged in to Google)
CHICAGO UTC-6 during CST (Central Standard Time, e.g., winter)
CHICAGO UTC-5 during CDT (Daylight Savings Time, e.g., summer)