GRAND FORKS, N.D. — Students in some North Dakota school districts will have an extended winter break as heavy snow has created dangerous travel conditions. Dozens of other school districts have delayed the start of classes Tuesday.

State transportation officials are advising against travel in northeastern, central and western North Dakota because of a storm that’s creating visibility issues on area roads.

Grand Forks County offices, including the courthouse, as well as city offices in Grand Forks are closed Tuesday.

Up to a foot of snow was expected in central North Dakota and northern Minnesota. About 8 inches already had fallen in Bismarck. Bitter cold temperatures also are forecast to blanket the region, with wind chills as low as minus 30 degrees.