Mar 16, 2026

Major weather threats bring blizzard conditions to U.S. northern tier, early heatwave to the West

Updated on: March 15, 2026 / 11:20 PM EDT / CBS/AP

Severe weather threats across the United States have millions of Americans on alert for blizzard conditions, potential tornadoes and record-breaking high temperatures in the coming days.

More than 11.5 million people are under blizzard warnings, another 4.3 million are under winter storm warnings, and about 20.6 million are under an extreme heat watch, according to forecasters.

A storm sweeping system is expected to bring life-threatening travel conditions in the Northern Plains and Upper Great Lakes, the potential for damaging winds and tornadoes across the eastern half of the country on Monday.

Across parts of the West, an unusually early heat wave is expected for much of the week.

Blizzard slams Northern Plains, Upper Great Lakes

A rapidly intensifying storm is producing blizzard conditions from eastern South Dakota through Wisconsin into Michigan's Upper Peninsula on Sunday.

Over 20 inches of snow fell in some portions of southeastern Minnesota and western Wisconsin as of Sunday afternoon, according to the National Weather Service. Transportation officials warned of worsening conditions with low visibility and snow-covered roadways.

Warnings of hazardous road conditions were issued across Minnesota, Michigan and Wisconsin, where transportation officials warned of worsening conditions Sunday with low visibility and snow-covered roadways.

More than 600 flights flying out of and into the Minneapolis-Saint Paul International Airport were canceled Sunday, according to FlightAware, a website that tracks flight disruptions. Dozens more through Detroit were also scrapped.

State officials have issued a no-travel advisory in southern Minnesota, and Gov. Tim Walz has authorized the Minnesota National Guard to support emergency operations, CBS Minnesota reported.

Wisconsin snowplow driver Aaron Haas said it was one of the worst storms he had seen in years. On Sunday, he was stacking piles of snow as high as his truck in the town of Marshfield.

"You can't see anything when you're on the highways outside of the city," he said.

Blizzard conditions are likely to stretch into Monday with additional lake-effect snow behind the storm.

Severe weather threat expanding east

The same storm fueling the blizzard is also triggering severe storms across the Midwest and South along a powerful cold front.

A developing squall line swept across parts of the Midwest and Mid-South on Sunday and is expected to move east overnight. Forecasters warn of an enhanced risk of severe weather from the Lower Great Lakes through the Ohio and Tennessee valleys.

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Tornado outlook for Monday, March 16, 2026, across the eastern U.S. CBS News

The threat is expected to intensify Monday, when a moderate risk of severe weather stretches across parts of the Mid-Atlantic. Storms could produce tornadoes, damaging wind gusts, hail and flash flooding as they push toward the East Coast, according to forecasters.

A stretch from parts of South Carolina to Maryland appeared most likely to experience particularly damaging winds Monday afternoon, the weather service said. That could include Raleigh, North Carolina; Richmond, Virginia and the nation's capital. The weather service said an increased — albeit much lower — risk stretched north to a portion of New York and south to northern Florida.

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Damaging wind outlook for much of the eastern U.S. on Monday, March 16, 2026. CBS News

Early-season heat building in the West

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