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Summer Heat and Flooding Likely Today

Dangerous and intense summer heat is likely in several locations today, from the central Plains to the Great Lakes and Northeast and in the Pacific Northwest. Meanwhile, heavy to excessive rainfall from organized areas of rain and thunderstorms are likely going to produce flood issues in the Upper Mississippi Valley. Also, monsoonal showers and storms may result in flooding in the Four Corners. Read More >

Overview of the December 10-11, 2021 Winter Storm

A strong area of low pressure tracked northeastward from the Central Plains to northern Lake Michigan Friday December 10 into Saturday December 11. The low reached 980 mb east of the U.P. by Saturday afternoon. This storm brought significant snowfall to most of the area - the second significant widespread snowfall in 5 days.

Precipitation had to fight through dry air initially, but once the atmosphere was saturated, snow fell heavily across the area Friday night. Snowfall rates of around an inch per hour were observed in many areas. This snow was wet and dense due to the atmosphere being relatively warm, with snow-to-liquid ratios of generally 10:1 or less.

Snow mostly ended early Saturday morning. However, a secondary burst of heavy snow tracked northeastward along the Lake Michigan shoreline through Menominee, Escanaba, Manistique, and eventually into Newberry the following morning (Saturday). Snow also lingered longer in Marquette and Alger Counties due to lake effect snow behind the system.

The heavy amounts of wet snow, along with gusty winds behind the storm, led to numerous power outages throughout south-central and eastern Upper Michigan.

This same storm system was responsible for several long-track and violent tornadoes in Illinois, Missouri, Kentucky, and Arkansas. Reviews of the severe weather aspect of this storm can be found from NWS Paducah, NWS Memphis, and NWS St. Louis.

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Storm Total Snowfall

Click here for a complete list of snowfall reports from this storm

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