PORTLAND – Just as things were returning to normal after back-to-back snowstorms, more wintry weather rolled into Maine on Tuesday with a mix of snow, sleet and freezing rain.

Classes and activities were delayed or canceled because of the weather front that prompted a winter storm warning in northern Maine and a winter weather advisory in southern regions.

This weather system was expected to have two waves of precipitation and to move out of the area quickly, said Jim Mansfield, a meteorologist with the National Weather Service in Gray. Northern parts of Aroostook, Piscataquis and Somerset counties were expected to see between 4 inches and 10 inches of snow by Wednesday morning, while coastal areas were expected to receive from 1 inch to 3 inches.

The winter weather came hours after Portland lifted a parking ban Monday night that was imposed because the snow from earlier storms had made some roads nearly impassable and had reduced visibility.

During the “snow emergency,” parking was allowed only on the odd-numbered side of streets while crews removed the snow. A similar parking emergency remained in effect in Biddeford, where parking is banned on even-numbered sides of all streets except Main Street.

The wet, heavy snow took its toll on a building that collapsed Monday morning in Naples. The Quonset-style building housed an electrical supply retail shop and storage and work areas for a refrigeration and air-conditioning business.

The tunnel-shaped steel building collapsed under the weight of the snow that had accumulated through the winter.

“The sides of the building were snow-covered, and we really have not had the melting,” said Carmen Caron, one of the owners. “Therefore, the snow on the top of the building could not slide down.”