LI Weather: Winter Storm Likely To Cause Holiday Travel Chaos

A hazardous weather outlook has been issued for Long Island, which may see its first accumulating snow on Sunday as millions hit the road on one of the busiest travel days of the year.

"A slow moving low pressure system may bring a light snow accumulation to portions of the region Sunday morning into Sunday afternoon," the National Weather Service says. "Precipitation is likely to change to all rain Sunday evening into Monday morning, before potentially changing back to snow Monday afternoon into Monday night. This may result in a messy travel conditions for the Sunday afternoon/evening and Monday afternoon/evening commutes."

An inch or less of snow accumulation is expected Sunday before the snow turns to rain. When the snow returns Monday afternoon, another inch of accumulation is possible.

The full forecast:

Friday Night- Partly cloudy, with a low around 25. Wind chill values between 20 and 25. North wind around 9 mph.

Saturday- Sunny, with a high near 41. Wind chill values between 15 and 25. Northwest wind 10 to 13 mph.

Saturday Night- Partly cloudy, with a low around 28. North wind 5 to 10 mph becoming light and variable after midnight.

Sunday- Snow before 10am, then rain and snow between 10am and 11am, then rain after 11am. High near 42. Wind chill values between 25 and 35. East wind 7 to 16 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

Sunday Night- Rain. Steady temperature around 41. Breezy, with a northeast wind 20 to 22 mph, with gusts as high as 32 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

Monday- Rain before 1pm, then rain and snow between 1pm and 2pm, then snow after 2pm. Temperature rising to near 38 by 10am, then falling to around 34 during the remainder of the day. Breezy. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

Monday Night- Snow likely, mainly before midnight. Cloudy, with a low around 29. Chance of precipitation is 60%.

Tuesday- Mostly sunny, with a high near 38.

Tuesday Night- Partly cloudy, with a low around 32.