"We are not out of the woods yet. If people are at home, you should stay home," Gov. Martin O'Malley said at an 11 a.m. press conference.
More precipitation was coming, the governor said. It would be a couple of inches of snow and sleet or just snow, Fox 45 reported.
The snow will hit in the late afternoon, according to officials.
"Around 4 p.m., we will see the second punch of this storm," Director of Maryland Emergency Management Agency Ken Mallette said.
Officials said that power outages may be possible Thursday afternoon.
The Maryland National Guard has deployed 50 Humvees to assist in the storm, WJZ reported.