The storm is predicted to affect millions of people as it makes its way from the West Coast to New England.
The National Weather Service (NWS) in Pittsburgh issued a winter storm warning for the area that went into effect Friday.
Lee Hendricks, NWS spokesman, said Fayette County residents can expect to wake up to rain and sleet Sunday morning, with possible snow accumulations in the afternoon.
Hendricks said the storm system is actually bringing in milder temperatures that will hit the mid-30s before falling into the upper 20s throughout the afternoon and late evening.
Hendricks said the snow is expected to taper off into flurries late Sunday night into Monday morning with temperatures dipping down to 5 or 10 degrees in the evening.
According to Hendricks, the remainder of the week appears to be dry until Thursday.