Millions of travelers across the United States are facing travel delays and difficulties as a powerful winter storm system continues to move across the country. The storm, which brought blizzard conditions to the central and northern Plains over Christmas, is slowly moving eastward, leaving a trail of heavy snow, ice, and rain in its wake.

Several locations experienced significant snowfall, with Spearfish, South Dakota reporting a whopping 14.6 inches, while Chadron, Nebraska saw 13 inches of snow. Parts of Colorado received over a foot of snow, and the Denver metro area saw a range of half an inch to over 6 inches.

As the storm system advances, a combination of ice and snow is causing problems in parts of eastern Colorado, Nebraska, South Dakota, Minnesota, and Missouri. Road conditions remain treacherous, and a messy mix of ice and snow is expected to continue, further exacerbating travel difficulties.

The storm is expected to push further east on Thursday, bringing light rain and snow showers to the Midwest, the Great Lakes, and the Ohio River Valley. In the Ohio Valley and the Tennessee River Valley, a light icy mix is possible on Thursday night into Friday. Although little to no snowfall accumulation is expected in southern locations, any flakes that do fall will be a novelty for these areas.

While the Midwest grapples with the winter storm, the East Coast faces a different set of challenges – dense fog and heavy rain. A new storm system developing in the Southeast is making its way up the East Coast, bringing with it more heavy rain and potential flooding in the mid-Atlantic, Northeast, and New England.

The mid-Atlantic, including the New York City area, can expect another 1 to 2 inches of rain, with local amounts possibly reaching up to 3 inches. River flooding is a concern, with the Passaic and Millstone rivers in the Northeast, as well as the Charles River in Dover, Massachusetts, being closely monitored.

Travel delays are expected in major airports along the East Coast, including Reagan National, Philadelphia, Newark, La Guardia, JFK, and Boston Logan, due to morning fog and later rain. The heaviest rain is projected to fall during the afternoon and evening hours on Wednesday for Washington, D.C., Philadelphia, and New York City. Boston will see the heaviest rain between midnight and 12 p.m. ET on Thursday.

With road and air travel affected by the winter storm and heavy rain, authorities advise travelers to exercise caution, plan for delays, and stay updated on the latest weather conditions.