CHICAGO — A broad and erratic patchwork of severe weather rumbled across much of the U.S. on Sunday, dumping heavy snow and making roads impassable in the Upper Midwest while damaging high winds swept across the Plains. Even Hawaii was affected, with parts hit by severe flooding.

Portions of the mid-South readied for late-day thunderstorms that forecasters say will spread eastward and by Monday threaten a large swath of the Eastern U.S., with mid-Atlantic states — including Washington, D.C. — most at risk for high winds and tornadoes.

Successive punches of snow, wind and severe weather are "going to impact the eastern half of the United States," AccuWeather senior meteorologist Tyler Roys said in an interview. Beyond the threat to lives and property, "whether it's wind gusts from a squall line, blizzard or snow, or just wind because of the storm, you're looking at several major airports being impacted."

More than a foot (30.5 centimeters) of snow fell in some portions of the Minnesota and Wisconsin as of Sunday morning, according to National Weather Service reports, with another several inches likely to fall in the Minneapolis area amid blizzard warnings by the weather service.

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.

"Roads are becoming impassable in many of Wisconsin's northern counties," the Wisconsin Department of Transportation said on social media. "Please stay off the roads to keep yourself and others safe."

The weather conditions created headaches for air travel too with hundreds of cancellations.

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.

Areas of central Wisconsin and Michigan's Upper Peninsula are likely to see over 2 feet (61 centimeters) of snow, with higher isolated totals, Roys said. Lower snow accumulations in places like Chicago and Milwaukee late Sunday and Monday w

ill still likely create troubles for commuters, he added.