On Sunday, there’s a chance of snow, but current forecasts indicate it could be light, the weather service said. “Even if it develops, the system will be rather weak and progressive, so snowfall totals and resulting impacts appear minor,” the weather service said in its Thursday morning forecast discussion.

A Winter Weather Advisory began for Pittsburgh and Western Pennsylvania at 4 a.m. and will be in effect until 4 a.m. Friday. The National Weather Service issued an alert at 4 a.m. saying to expect between one to three inches of snow,

Snowfall totals on Thursday are expected to be light. The weekend forecast for a more serious winter storm remains uncertain.

Separate rounds of winter storms could impact the Northeast as cold air tightens its grip, forecasters say. Key Highlights: Bitter cold temperatures, 10 to 20 degrees below average, are expected starting Tuesday,