A coating of snow in the Baltimore region Wednesday evening could make for a slick commute Thursday morning, the National Weather Service warned.

About a half-inch of snow started to accumulate in the Baltimore area Wednesday night as temperatures dipped below freezing. Meteorologists expected the snow to taper off by 11 p.m., but said untreated surfaces would likely remain slick through the morning, until temperatures begin to rise.


“Temperatures will stay around or several degrees below freezing, so any untreated surfaces will remain slippery through the morning,” said Meteorologist Dean Hofmann, “even though the snow will have stopped by then.”

In a weather advisory, the National Weather Service cautioned drivers that the combination of Wednesday evening snow and frigid temperatures “could lead to hazardous traveling conditions, multiple accidents, and extensive delays,” the weather service warned.

AAA encouraged drivers to delay their morning commute, if possible.

“Any time drivers can avoid being on the road when it’s snowing, even if it’s not snowing heavily, that’s going to be the safest choice,” said Ragina Cooper Averella, a spokeswoman for AAA Mid-Atlantic. “If you must be on the road, give yourself extra time and take it slow.

Maryland State Highway Administration said in a tweet that roads had been pre-treated, but also cautioned drivers on the road overnight and early Thursday.

Baltimore’s Department of Transportation said crews pretreated city gateways with brine.

Bitter Arctic cold is forecast to remain over the region into the weekend. Temperatures fell to 20 degrees early Wednesday morning at Baltimore-Washington International Thurgood Marshall Airport, the coldest there since March 15.

That was also the last time temperatures did not rise above freezing all day at BWI — something that could occur again Wednesday. Steady 20 mph winds and gusts up to 30 mph were making it feel no warmer than the lower 20s throughout the day.

Lows are forecast in the mid-20s overnight into Thursday, with wind chills in the mid-teens.

Cold temperatures are expected to continue through the weekend, with highs only reaching the 30s each day and overnight lows in the 20s. But by next week, more normal temperatures for this time of year are expected. Highs will be in the mid 40s to 50s.

More snow is possible Friday night, but is expected to be “more hit or miss,” forecasters said.