Snow Accumulating in Mount Vernon's Weekend Forecast

MOUNT VERNON, NY — We all know that weather can change fast. This week's a perfect example. On Monday, meteorologists predicted a 30 percent chance of snow for the weekend. Just Wednesday, they were all in agreement that the much discussed potential-first-accumulating snow of the season wouldn't happen.

Now they're forecasting 2 to 4 inches in the lower Hudson Valley.

The short version: while waves of Arctic air continue in from Canada as expected, the Atlantic storm making its way up the East Coast got more organized and shifted its track westward.

The National Weather Service put a Winter Weather Advisory out Friday for Putnam, Rockland and Westchester counties:

6 AM SATURDAY TO 1 AM EST SUNDAY

WHAT...Snow expected. Plan on hazardous travel conditions. Total snow accumulations of 2 to 4 inches are expected.

WHERE...Portions of northeast New Jersey and southeast New York.

WHEN...From 6 AM Saturday to 1 AM EST Sunday. Highest snow accumulation should occur Saturdaymorning into Saturday evening.

ADDITIONAL DETAILS...Be prepared for reduced visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.

For a more detailed look, check out Hudson Valley Weather's Facebook page: Facebook Livestream – Saturday Snow Discussion.

Patch will keep you updated.

Meanwhile, here's the detailed weekend forecast for southern Westchester from the NWS:

• Today: Mostly cloudy, with a high near 42. Wind chill values between 30 and 35. Southwest wind around 7 mph.
• Tonight: A 20 percent chance of snow after 3am. Cloudy, with a low around 28. West wind 5 to 7 mph becoming calm after midnight.
• Saturday: Snow. High near 31. Wind chill values between 25 and 30. Calm wind becoming north 5 to 9 mph in the morning. Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible.
• Saturday Night: Snow likely, mainly before midnight. Mostly cloudy, with a steady temperature around 32. Wind chill values between 25 and 30. North wind 6 to 9 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
• Sunday: Mostly sunny, with a high near 37. West wind 10 to 15 mph, with gusts as high as 26 mph.
• Sunday Night: Partly cloudy, with a low around 24.

MAP: AccuWeather.com