A storm expected to pummel the East Coast with heavy snow ahead of Valentine’s Day will largely pass over Butler County, but may bring slippery conditions to bridges and overpasses early Tuesday morning, according to the National Weather Service.

Lee Hendricks, meteorologist with the National Weather Service in Pittsburgh, said rain will gradually turn into snow shortly after midnight.

The chance of snow is 50%, Hendricks said, with possible snow accumulation nearing 1 inch. The heaviest snowfall will occur around sunrise, he said.

“We’re not looking for the snow to stick around,” Hendricks said, noting that “ground temperatures are fairly warm.”

“The only place to consider, possibly, any slippery areas would be bridges, overpasses — those kinds of things,” he said.

In preparation for the Nor’easter that will deliver “varying amounts” of snow across the state, the Pennsylvania Department of Transportation and Pennsylvania Turnpike Commission advised motorists on Monday to “avoid unnecessary travel during the storm.”

Along with pre-treating road with salt, PennDOT announced speed and vehicle restrictions will be implemented during the storm.

“With freezing temperatures, roads that look wet may actually be icy, and extra caution is needed when approaching bridges and highway ramps where ice can form,” PennDOT said.

The full list of speed and vehicle restrictions, as well as travel alerts, can be found online at www.511pa.com.