Blizzard conditions are expected from Delaware into southern New England, and travel will be "extremely treacherous" to "nearly impossible" today, according to the National Weather Service Weather Prediction Center.

Expect travel delays along the I-95 corridor, as well as flight cancellations at airports from the Mid-Atlantic to the Northeast.

Nearly 5,600 flights in, out, or within the US were cancelled at the start of the week, according to flight-tracking website FlightAware.

Travel nightmare for Republic Airways, JetBlue, Delta Air Lines, American Airlines, and United early Monday morning, with the bulk of the cancellations affecting these airlines.