A powerful winter storm swept across much of the U.S. on Monday, causing widespread travel disruptions. Heavy snow and ice led to the cancellation of 1,846 flights and delayed over 4,300 more by early afternoon, according to FlightAware, a flight-tracking service. Major airlines, including Delta, American, United, and Southwest, issued travel advisories to alert passengers of potential delays and cancellations.

Southwest Airlines was the most affected carrier, canceling 400 flights, followed by Republic Airways and American Airlines with 231 and 190 cancellations, respectively. Airports also bore the brunt of the storm, with Reagan National Airport in Washington, D.C., canceling 259 flights—65% of its scheduled services. The disruptions underscored the storm’s sweeping impact on transportation across the country.

The winter storm prompted warnings and advisories in more than a dozen states stretching from Kansas and Missouri to New Jersey. Meteorologists with the National Weather Service (NWS) warned that some areas could experience their heaviest snowfall in a decade. Kansas recorded up to 18 inches of snow along portions of Interstate 70, while parts of upstate New York reported accumulations of several feet.

The storm’s severity also led to emergency declarations. Washington, D.C., Mayor Muriel Bowser declared a snow emergency effective through Tuesday, urging residents to avoid nonessential travel. In neighboring Maryland, Governor Wes Moore issued a state of emergency and echoed similar warnings. Officials across the affected regions have cautioned residents to stay off the roads as icy conditions and poor visibility make travel hazardous.

This winter storm serves as a stark reminder of how quickly severe weather can disrupt daily life and critical infrastructure. As snow continues to blanket parts of the mid-Atlantic and Northeast, travelers and residents alike are bracing for continued challenges. The NWS and local authorities are urging people to monitor updates and prioritize safety during this unprecedented weather event.