After a mix of snow, sleet and rain fell across Central Maryland and created icy conditions on roads Monday, significant snowfall is possible in northern portions of the Baltimore region through this morning.

Another several inches of snow and a glaze of ice are possible by this morning in Carroll, northwestern Harford and northern Baltimore counties, with 3 inches to 7 inches of total accumulation expected by this morning, including snowfall from Sunday night and Monday. A winter storm warning is in effect through 10 a.m. today in those areas.

As much as 9 inches of total snowfall is possible in some spots in Baltimore and Harford counties along the Pennsylvania line, the National Weather Service said.

Across most of the rest of the Baltimore region, a winter weather advisory warned of a glaze of ice overnight. A few inches of snow is also forecast across southeastern Harford County.

But wintry precipitation is forecast to taper off in the morning hours, starting around Baltimore.

“We’re expecting it to change over to plain rain, probably even before sunrise,” National Weather Service meteorologist Cody Ledbetter said.

It will be a cold rain, though. Temperatures around Baltimore are forecast to only reach the mid-30s today.

Throughout Monday, precipitation fluctuated between rain and snow or sleet. Illustrating how narrow the dividing line was, temperatures held steady at 32 degrees for at least 14 hours straight at Baltimore-Washington International Thurgood Marshall Airport on Monday, while the Inner Harbor hovered around 33-34 degrees.

“Anything that’s not treated will be slippery,” said Dan Hofmann, a meteorologist with the weather service.

Drivers were urged to drive slowly to avoid accidents, he said.

Around the state, some drivers hydroplaned and skidded into barrier walls during the Monday morning commute, according to a spokesman with the State Highway Administration.

“We’re asking people that they slow down, go a little below the speed limit,” said spokesman Charlie Gischlar.

The weather caused most schools in the region to close Monday. By Monday evening, school systems in Baltimore, Carroll and Harford counties had announced two-hour delays for today.

The weather service reported as much as 4.7 inches of snow in Bel Air, 3.2 inches in Manchester, 2.7 inches in Parkton and 2.8 inches in Perry Hall.

Rain is forecast to continue through tonight, and, with cold air blowing in as the system departs early Wednesday, another brief period of flurries is possible, Ledbetter said.

Then, mild conditions are forecast by Thursday and Friday, when highs are expected to reach the lower 50s.

Baltimore Sun reporters Lillian Reed, Christina Tkacik, Sarah Meehan and Yvonne Wenger contributed to this article.

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