A powerful and deadly winter storm that brought heavy snow and widespread flooding to the United States continued to travel east on Tuesday morning, leaving more destruction in its path.

The National Weather Service issued winter weather advisories and winter storm warnings in parts of Pennsylvania, New York and New England as the storm was poised to finally exit the country. But the storm’s fury was still being felt across the nation, particularly in the Great Plains and Ohio and Mississippi valleys, where numerous flood warnings remained in effect.

The National Oceanic and Atmospheric Administration (NOAA) said 438 river gauges across the nation were in flood stage on Tuesday morning, 53 of which were experiencing “major flooding.” Most of them were clustered in the central United States, though a few were in the southeast. In many locations, floodwaters had already reached or were threatening to surpass historic levels.

Fueled by 10 inches of rainfall in the vicinity, the Illinois River near Tahlequah, Oklahoma, reached an all-time high crest of 30.69 feet on Monday, more than 2.5 feet above the previous record that was set 65 years ago, the NOAA reported. The floodwaters had receded to about 21 feet there on Tuesday morning, though that was still more than three feet above the threshold for what is considered major flooding. The NOAA said parts of Texas, Arkansas and Missouri also saw 10 or more inches of rain, including a storm-high 12.25 inches near Union, Missouri. The storm also packed a powerful punch in Illinois, dumping 9.98 inches of rain near Roxana.

Rising waters prompted the mayor of St. Louis to declare a city emergency. Just south of the city in Arnold, the NOAA reported Meramec River was already experiencing major flooding, and was expected to surpass its all-time high level of 45.3 feet later this week. That water flows into the Mississippi River, and the NOAA projected that the further-south riverside communities of Chester, Illinois, and Cape Girardeau, Missouri, were also expected to tie or break local crest records.

That’s just a sampling of the storm’s flooding, and the 438 river gauges do not necessarily cover the lakes or other water bodies causing floods. In southern Missouri, for example, the U.S. Army Corps of Engineers reported that waters at Table Rock Lake rose approximately 17 feet between Monday and Tuesday, fueling a massive release of water into flood-prone Lake Taneycomo. The United States Geological Survey reported that waters at Ozark Beach Dam in Forsyth, some 20 miles away from Table Rock Lake, rose three feet between Monday and Tuesday.

The storm brought more than just flooding and heavy rains.

More than three inches of sleet fell in Iowa and Illinois, the NOAA reported. But an inch was enough to snarl traffic at Chicago O’Hare International Airport, one of the world’s busiest.

Flight monitoring website FlightAware.com reported that 1,366 flights to or from the airport were cancelled on Monday, more than half of the airport’s scheduled traffic. Another 303 flights involving Chicago Midway International Airport were also cancelled, according to FlightAware, and lingering effects of the storm caused an additional 236 cancellations at O’Hare on Tuesday.

According to NOAA data, no place came close to receiving the 41 inches of snow the storm dumped on Bonito Lake, located in a mountain range in New Mexico. But the storm did produce more than nine inches of snow in Oklahoma, Iowa, Michigan, Minnesota, Wisconsin and Texas.

The storm knocked out power to tens of thousands in Oklahoma, according to utility companies.

While the storm appears seems to have weakened considerably, it’s still packing a punch. According to the National Weather Service, parts of Maine could receive up to a foot of snow.