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Minnesota is setting records – cold, cold records.

Snowfall topped 30 inches Wednesday – making this month not only the snowiest February in history, but one of the top 10 snowiest months ever for the North Star State, according to the National Weather Service.

It also marked the first time Minnesota has seen more than 30 inches of snow since December 2010, when the weight of the white stuff caused the roof of the Metrodome in Minneapolis to collapse, the weather service said.

Austin Tauber walks his bicycle through heavy snow in Anoka, Minnesota, on Wednesday.
David Denney/Star Tribune/AP
Austin Tauber walks his bicycle through heavy snow in Anoka, Minnesota, on Wednesday.

About 100 million Americans are facing the threat of winter weather and flooding into Thursday morning.

The potent winter storm had prompted officials to close schools in Minnesota and the federal government to close all its offices in Washington, DC, with a handful of exceptions on Wednesday.

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More than 2,200 flights were canceled Wednesday and nearly 40% of them were scheduled to land or take off from Washington or Baltimore airports, according to FlightAware. Chicago, New York, Philadelphia and Newark, New Jersey, airports were seeing flights called off.

A guard stands in front of the White House on Thursday.
Aurora Samperio/NurPhoto/Getty Images
A guard stands in front of the White House on Thursday.

A mixture of snow, sleet, freezing rain and some flooding will linger across much of the East until Thursday morning while residents in the Southeast will face several rounds of rain into the weekend.

From Louisiana to Alabama, and the Ohio Valley, too, face the threat of dangerous flooding, forecasters said.

Coast to coast

The nasty weather has been pounding the entire country, as two separate storms – one on each coast – are bringing winter weather watches, warnings and advisories to the northern United States.

Initially, a warm moist air streaming north from the Gulf of Mexico combined with a colder storm system exiting the Rockies created a wintry mix Tuesday night that carried into Wednesday.

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Much of the Pacific Northwest is also under winter weather warnings or watches.

Washington and Baltimore to take the storm’s brunt

About 3 inches of snow have fallen in Washington and Baltimore and a wintry weather is expected to last into Thursday. As warmer air mixes in, it could leave a thin layer of ice – around 1/10 of an inch – on roads and other surfaces in the region.

The heaviest snow, 10 inches, was seen in Pennsylvania and Minnesota while parts of Maryland have seen nearly 7 inches of snow, the weather service in a preliminary report.

• Heavy snow or ice are expected from Philadelphia northward to west of New York City. Some to 2 to 3 inches of snow could fall. New York will likely see a few inches of snow Wednesday afternoon before it transitions to rain by the evening. The National Weather Service said Tuesday afternoon that some areas near the Maryland-Pennsylvania border will get up to 8 inches of snow.

A pedestrian strolls past a statue of Pittsburgh Pirate Willie Stargell outside PNC Park on Wednesday.
Gene J. Puskar/AP
A pedestrian strolls past a statue of Pittsburgh Pirate Willie Stargell outside PNC Park on Wednesday.

Students in the School District of Philadelphia – the nation’s eighth largest by enrollment – were told to stay home Wednesday, but building engineers and those in administrative roles were instructed to report for work.

In New York and Baltimore, city and transportation officials warned commuters that the snow, sleet and freezing rain could make travel difficult.

“Use mass transit where possible. Allow for extra time and exercise caution while traveling,” Joe Esposito, commissioner of New York City Emergency Management, tweeted.

The snow and wintry mix will make their way northward throughout the night, reaching Maine and northern New England by Thursday morning and turning into rain in the southern areas of Virginia and Pennsylvania.

Flooding to affect much of South, especially Tennessee

Rain continues falling from the Ohio Valley into the Southeast and threatens to bring severe flooding to some areas through the end of the week.

• A moist warmer air mass will allow for extreme rain Tuesday through the end of the week from the Ohio Valley into the Southeast. Flood or flash flood watches will extend from northern Alabama and Mississippi northward to West Virginia.
• Two to 4 inches of rain is expected across the region, with even higher amounts of 5 to 7 inches in Memphis and Nashville through the end of the week.
• Multiple rounds of rain will affect North Georgia this week. Cities such as Atlanta are likely to receive 2 to 3 inches of rain, and even higher amounts are expected in the mountains to the north.

Forecasters say to expect 2 to 4 more inches of rain but have also predicted 5 to 7 inches in parts of Tennessee, including Memphis and Nashville, through the end of the week.

A man runs across the Key Bridge in Washington D.C. on Wednesday.
Brendan Smialowski/AFP/Getty Images
A man runs across the Key Bridge in Washington D.C. on Wednesday.

Birmingham, Alabama; Louisville, Kentucky; Lexington, Kentucky; and Charleston, West Virginia, also face the threat of significant flooding.

The threat for heavy rain in parts of northern Alabama and Tennessee will diminish Wednesday afternoon, the weather service said, but may continue into central and northeast Alabama overnight.

As the rain continues through the Southeast, forecasters said, another round of heavy rain taking shape will slowly move, drenching the region through Saturday.

“The hardest hit areas will be from northern Louisiana to Kentucky, where an additional 2-4 inches of rain is expected. This is on top of the 2-5 inches that has already fallen across the same area in the last few days,” CNN meteorologist Taylor Ward said.

Multiple waves of rain will affect North Georgia this week. Atlanta is likely to receive 2 to 3 inches of rain, with higher amounts expected in the mountains to the north.

CNN’s Dave Hennen contributed to this report.