* Updated Snowfall Forecast *
Periods of snow will fall over the SE half of the Hudson Valley this afternoon, and the further SE you go, the steadier and heavier it will be. Here’s our final thought on this…
- North and west of Zone 8 : Generally trace to 2″…
- Southern Zone 4 and Zone 8 : 1″ to 3″
- Zone 9 : 2″ to 6″
The map is a bit more detailed than we can describe in words. The NW edge of the snow has advanced about 25 miles further than expected. Unfortunately in Putnam, Rockland and Westchester counties… a short distance translates into big changes. The cold air acts like a wall, stopping the snow from advancing NW. Where it snows, it will likely snow hard… because once the air saturates, the moderate snow that falls from the sky, will reach the ground.
- North of I-84 & West of Hudson River: will likely see periodic light snow and flurries, accumulating from a possible dusting to at most a half inch.
- North of I-84 & East of Hudson River: periods of light to moderate snow are likely, roads could be slick, and you could see a dusting to an inch or so
- South of I-84 & West of the Hudson River: roads will likely deteriorate quickly… with snowfall amounts ranging from a coating near I-84, to an inch or two (maybe 3) as you get toward the NJ border. Conditions won’t be as bad as east of the river, but they won’t be any picnic either.
- South of I-84 and East of the Hudson River: This is where the worst conditions will be. Road conditions are likely to already be terrible. The steadiest and heaviest snow will be in this area, and accumulations could range from 1 to 3 or 4 inches. As you go further into Westchester county, it wouldn’t be unreasonable to see a 6 inch total.
So the 25 to 30 miles NW we shifted the western edge, means we will now likely see a plowable snow in Putnam, Rockland and Westchester. Because of the very cold air… we will get a high ratio snow. That means normally, you get 10 inches of snow, for every 1 inch of liquid. Well, in temps this cold… you can get 15 or 20 inches of snow for every 1 inch of liquid. So expect the fluff to accumulate quickly where it snows steadily.
Snow is expected to taper off from west to east between 4pm and 7pm west of the Hudson River… and between 5pm and 8pm east of the Hudson River on average. This situation will continue to develop this afternoon, and we’ll have a wide variety of conditions across the region. We’ll start a separate post for conditions reports as well. Be safe, stay warm… and take it easy on the roads. With the snow further NW than expected, road crews may be caught off guard.