The National Weather Service has extended its winter storm warning until 7 a.m. Monday for most of northeast Indiana and northwest Ohio.
And in Kosciusko and Wabash counties, where the warning has been canceled, it was replaced with a blizzard warning, the weather service said tonight.
In areas north of Fort Wayne, it said, heavy snow with rates of 1 inch per hour will continue through mid-evening before ending, with storm totals of 8 to 16 inches expected.
The weather service said northwest winds of 20 to 30 mph, with gusts to 35 mph, will cause significant blowing and drifting snow tonight into Monday, which could produce near white-out blizzard conditions at times.
Temperatures will drop to between 7 below zero and 20 below zero tonight, it said, with deadly wind chills between 30 degrees below zero and 45 degrees below zero through Tuesday.
In Adams County, Ind., and Van Wert County, Ohio, 6 to 10 inches of snow are expected, the weather service said. The lows will reach 5 below zero to 15 below zero, with similar deadly wind chills.
In Kosciusko and Wabash counties, the snow will taper off through mid-evening, but accumulations of 10 to 16 inches are expected, the weather service said.
Winds of 25 to 35 mph, with gusts to 40 mph, are expected this evening, it said. Similar deadly wind chills are expected through Tuesday.