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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.

Monday, July 26, 2021

SPC Jul 27, 2021 0100 UTC Day 1 Convective Outlook

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0738 PM CDT Mon Jul 26 2021 Valid 270100Z - 271200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF NORTHERN MINNESOTA INTO NORTHWEST WISCONSIN... ...SUMMARY... Supercells and bowing structures with large hail and damaging winds are expected overnight from eastern North Dakota into northern Wisconsin. ...ND to WI... Weak mid-level disturbance appears to be affecting northern MN this evening. This feature will track southeast toward northern Lake MI overnight with mid-level height rises expected in its wake across the upper MS Valley. Several clusters of severe thunderstorms have evolved across northern MN and this activity is propagating southeast at 30-35kt toward the western portions of Lake Superior/northwestern WI. Latest thinking is this convection will continue to grow upscale as a reservoir of buoyancy currently extends ahead of this activity downstream across northern WI. Severe damaging winds and large hail are likely with this evolving complex of storms. Across eastern ND, strong surface heating allowed temperatures to rise well into the 90s to near 100F ahead of the surface low. Isolated thunderstorms have developed along the boundary west of JMS but updrafts are currently struggling. It's not entirely clear how much additional convection will develop along the front, but a very unstable air mass does exist across eastern ND/western MN. Any storms that mature in this environment may produce damaging winds/hail. ..Darrow.. 07/27/2021 Read more LIVE: