Some rain Sunday put a damper on things, and more is expected, with a low pressure frontal boundary moving across the region.
A NOAA satellite image showed a storm system through most of the East, producing snow in the Great Lakes, thunderstorms in the Southeast and icy rain in New England.
In the Washington/Baltimore area, flash flooding was a concern as rain, heavy at times, was predicted for Monday.
Downpours could pose hazards on the roads just as travelers were headed to holiday destinations, weather experts warned. Flights could also be delayed.After Monday's rains, the air is expected to turn progressively colder through Christmas Day, with as much as a 30-degree temperature drop.
Snow showers will cross Washington, D.C., Tuesday afternoon, with some dusting of snow a possibility. Skies are expected to be sunny after that.