Mild and rainy conditions Tuesday gave way to snow and cold by early Wednesday morning, with close to an inch of snow falling in some parts of Carroll, Baltimore and Harford counties.
A few tenths of an inch of snow was reported in areas along the Interstate 95 corridor, according to the National Weather Service.
Accumulation kept mostly to grassy surfaces because pavement is relatively warm from days of mild weather. But State Highway Administration officials urged motorists to be careful on ramps, bridges and overpasses, because those structures can freeze more quickly than other roadways.
“Patchy ice possible on roads early this morning,” the weather service said Wednesday morning. “Snow falling on warm roads has left many highways wet early this morning. With temperatures continuing to fall until sunrise, the risk of some spots icing up exists. The spots most vulnerable to icing are bridges and overpasses. The risk of icy patches should end after sunrise.”
Temperatures are forecast to reach the upper 30s Wednesday afternoon, with sunny skies helping to melt any snow and dry roadways. Significantly colder air is forecast overnight, with lows forecast in the lower 20s by Thursday morning.
Temperatures reached at least 59 degrees Tuesday afternoon at Baltimore-Washington International Thurgood Marshall Airport, about 10-15 degrees warmer than normal for this time of year, and were expected to drop to around the freezing mark by daybreak Wednesday.
Snow can fall even if temperatures are above freezing on the ground because in higher layers of the atmosphere, temperatures drop as elevation increases.
Thursday is expected to be sunny but cold, with a high near 36 degrees. The temperature should drop below freezing by kickoff of a game at M&T Bank Stadium between the Ravens and the New York Jets, at 8:20 p.m.
Sunshine is in the forecast Friday, with a high near 45 degrees. Rain is likely in the afternoon and evening hours. Rain showers could continue into Saturday and Saturday night, with otherwise cloudy skies. Sunday should be partly sunny with highs near 50 degrees.