DULUTH — Heavy snowfall has canceled or delayed school in some northeastern Minnesota communities.

All public, private, parochial and charter schools are closed today in Duluth. The Lake Superior School District, which includes Two Harbors and Silver Bay along with schools in Proctor, Hermantown and the Cook County school district are also closed.

The National Weather Service says more than a foot of snow has accumulated in Duluth and Two Harbors. Forecasters are expecting another 1 to 3 inches of snow through Tuesday afternoon when another round of heavy snow is expected to move into the region. Snow accumulations may exceed 20 inches from Grand Rapids to Duluth.

The weather service has issued a winter storm warning for the region through late Wednesday.