The thick buildup of ice around the Valley is an obstacle for road crews and a headache for residents.
The emergency order officially went into effect at 1 p.m. Monday.
A drop in temperature in expected Monday morning which will cause a layer of ice to form on the roadway.
PennDOT has temporarily reduced the speed limit on Interstate 80 in Mercer, Venango, Clarion and Jefferson counties.
Heavy bands of snow began to move across the viewing area Sunday morning.
Scientists say the phenomenon is supposed to happen just once every few years.
Several accidents are being reported across the Valley after freezing rain moved into the area.
Storm Team 27 is on alert for freezing rain and road crews are anticipating the need to pretreat roads and highways.
The National Weather Service says accumulations of 18 to 24 inches are possible by Tuesday afternoon in several Northeast states.
Massachusetts and Maine were expected to fare the worst, with 1 to 3 feet of snow.
PennDot officials are encouraging travelers to keep alert and allow time to arrive safely.
Road crews began using an”anti-skid” mix on the roads for the first time Sunday night.
A major snowstorm packing up to three feet of snow barrels down on the region.
Parking bans are in place in Leetonia, Salem, and Struthers through 6 p.m. Monday.
The storm could dump 2 to 3 feet of snow from northern New Jersey to Connecticut.
Several multi-car crashes in icy conditions on interstates in the Philadelphia area claimed at least four lives and injured dozens on Sunday…
Mahoning County Engineer Pat Ginnetti said the county spends a couple hundred thousand dollars a year fixing potholes.
Crews work to find the right mix of road treatments for the changing weather.
The Pennsylvania Turnpike has issued a travel advisory Monday because of the snow and freezing rain.
Blowing and drifting snow is making for tedious work for road crews.