From the NWS Pittsburgh:

We've transitioned to heavier snow showers this afternoon. We are keeping an eye on these heavier banded snow showers as they push east into the evening rush hour as observations in eastern Ohio have dropped down to 1/4 mile visibility and a quick coating on roadways.

Note that we will issue snow squall warnings if needed on top of an existing winter weather advisory, but we will not do so where the winter storm warnings are. We'll continue to monitor over the next couple hours

Jeff. WB1AAL