Heavy snow as well as ice could make driving hazardous during the winter storm warning period, according to the National Weather Service.

MARYLAND — With forecasters projecting several inches of heavy snow across the Baltimore-Washington region, winter storm warnings have supplanted the earlier watches in most of Maryland. Up to 8 inches of snow could fall in parts of the state by Thursday morning, the National Weather Service warns.

A winter storm warning means snow, sleet and ice could make travel very difficult or impossible, according to the National Weather Service.

About 4 to 6 inches of heavy snow and 0.1 inch ice are in the forecast Wednesday for much of central Maryland.

Here are the weather alerts that take effect on Wednesday, Feb. 20:

  • 1 a.m. to 7 p.m. —Howard, Montgomery and Prince George's counties are under a winter storm warning for 4 to 6 inches of snow and up to 0.1 inch ice.
  • 4 a.m. to 7 p.m. — Anne Arundel, Baltimore, Carroll and Harford counties are under a winter storm warning for 4 to 6 inches of snow and up to 0.1 inch ice.
  • 1 a.m. Wednesday to 1 a.m. Thursday — Allegany, Frederick and Washington counties are under a winter storm warning for 5 to 8 inches of snow and up to 0.2 inch ice.
  • 6 a.m. to 7 p.m. — Caroline, Cecil, Kent, Queen Anne's and Talbot counties are under a winter storm watch calling for 2 to 5 inches of snow.

Travel could be very difficult, particularly for the morning and evening commutes, due to slippery road conditions, weather officials said.

Snow melt may lead to localized flooding on Thursday, according to a hazardous weather outlook from the National Weather Service.