A blizzard warning has been issued for parts of upstate New York along Lake Ontario, as dangerously cold temperatures move to the Northeast from across the Upper Midwest.

Arctic air and wind gusts approaching 70 mph threatened the New York region with dangerous cold. The National Weather Service said blizzard warnings were in effect Thursday until 1 a.m. Friday.

Forecasters said lake-effect snow was accompanied by winds of 30 mph to 50 mph, causing whiteout conditions in some places.

Storms that began Wednesday dumped a foot of snow on parts of the Buffalo area, where dozens of schools south and east of the city canceled classes Thursday.

(AP)