Eastern PA under winter weather advisory as projected snow totals for region increase. When it will start and what to expect.

More snow is on the way for southeastern Pennsylvania as yet another winter storm is set to impact the area.

The National Weather Service has issued a winter weather advisory for the entire region for 3 to 5 inches of snow, up from the 2 to 4 inches that was initially expected. The advisory is in effect from 4 a.m. to 10 p.m. Friday.

Snowfall projections from the weather service’s Mount Holly, N.J., forecast office now show most of southeastern Pennsylvania on the higher end of the expected range. However, areas to the north and west, including northwestern Berks County, are likely to see lower totals in the 3-4 inch range.

Slick road conditions are likely, and will lead to a potentially hazardous morning and evening commute, the weather service warns. With temperatures set to plummet even further after the storm late Friday night, flash freezing of untreated roads is likely.

Light snow is expected to develop early Friday morning, later than initially expected, and will continue throughout the day as surface low pressure moving over the Ohio Valley transfers to a strengthening low developing off the mid-Atlantic coast, according to the weather service forecast discussion. Unlike the storm earlier this week that saw snow turn to rain, temperatures are expected to remain below freezing, keeping the precipitation as all snow, the forecast discussion notes.

Coming in behind the storm will be another arctic air mass that will cause low temperatures to drop from the 20s Friday night to the teens Saturday morning, according to the weather service. Wind chill values will range from single digits to as low as 10 below zero.

The deep freeze will last through the weekend, before things warm up, relatively speaking, early next week. Temperatures by Tuesday and Wednesday should be around average for this time of year.