The first week of December could turn wintry rather than feel like late autumn, perhaps to get everyone into an early holiday mood, or at least some sledding.

The National Weather Service in Mount Holly, New Jersey, said Sunday that a storm system is scheduled to bring snow and rain Tuesday to the Lehigh Valley and outlying regions.

Areas of the Valley along Interstate 78 could get 1-4 inches of snow beginning early Tuesday, with possible snowfall rates of a half inch to 1 inch per hour.

There’s a 50-50 chance of the Valley seeing at least 2 inches, according to the forecast, before the snow is scheduled to change to rain by Tuesday afternoon.

The southern Poconos and northwest New Jersey could see up to 8 inches, according to the forecast.

After the first measurable snowfall of December, the remainder of the week will see chilly, at times windy, days and nights, but no more snow or rain is scheduled until Friday night.

Here is the Weather Service’s extended forecast:

Sunday night: Mostly cloudy, then gradually becoming mostly clear, with a low around 30. West wind around 10 mph, with gusts up to 20 mph.

Monday: Sunny, with a high near 41. Northwest wind 5-10 mph, with gusts up to 20 mph.

Monday night: A chance of snow after 1 a.m. Increasing clouds, with a low around 26. North wind around 5 mph becoming calm. Chance of precipitation is 50%. New snow accumulation of less than 1 inch possible.

Tuesday: Snow before 10 a.m., then rain and snow. The snow could be heavy at times. High near 38. East wind 5-10 mph becoming northwest in the afternoon. Chance of precipitation is 90%. New snow accumulation of 1 to 4 inches possible.

Tuesday night: A slight chance of rain and snow before 10 p.m. then a slight chance of snow until 1 a.m. Partly cloudy, with a low around 23. Chance of precipitation is 20%.

Wednesday: Sunny, with a high near 37.

Wednesday night: Mostly cloudy, with a low around 24.

Thursday: Mostly cloudy, with a high near 39.

Thursday night: Partly cloudy, with a low around 14.

Friday: Partly sunny, with a high near 30.

Friday night: Snow likely. Mostly cloudy, with a low around 21. Chance of precipitation is 60%.

Saturday: A chance of rain and snow. Mostly cloudy, with a high near 36. Chance of precipitation is 40%.