UPDATED: Jan. 23, 2014 9:57 p.m.
ORIGINAL: Jan. 23, 2014 6:01 a.m.
LANHAM, Md. (CBSDC) — The Washington area is heading into a fourth day of frigid weather and school closings and delays.
Following Tuesday’s winter storm, which dumped as much as 10 inches of snow on the region, many schools in Maryland have continued to delay the start of class while many major school systems in Virginia remain closed Friday.
Public schools in Anne Arundel County, Calvert County, Fairfax County, Manassas City, Prince George’s and Prince William County will open two hours late on Friday.
Culpeper County, Fauquier County, Frederick County, Loudoun County, Spotsylvania County, St. Mary’s County and Stafford County Public Schools will be closed.
A Wind Chill Advisory is in effect until 9 a.m. Friday for Montgomery, Howard and Frederick counties in Maryland and Loudoun County in Virginia.
Temperatures will struggle to reach the mid-20s Friday, with wind chills making the air feel in the single digits.
The frigid air will keep the snow and ice around until at least the weekend. Channel 9 meteorologist Howard Bernstein says temperatures will not rise above freezing until Saturday, when another batch of snow is expected to make its way to the region.
Flurries are possible on Saturday, which may leave a light coating of snow across most of the D.C. area.
Overnight low temperatures Thursday are expected to drop below zero in some places, Channel 9 meteorologist Topper Shutt says.
Prolonged exposure to the cold air can lead to hypothermia or frost bite on exposed skin.
Federal workers were told Thursday to report to work on time for the first time since the storm.
The extreme cold also impacted rail travel Thursday. Metro riders experienced delays of up to 30 minutes on the Blue and Yellow Lines due to a cracked rail between Braddock Road and National Airport. Rails can become damaged by sharp changes in temperature, according to Metro officials.