Huge difference in snowfall amounts

Rain in the Mohawk Valley, but up to 9" of snow so far in the higher elevations south of the Mohawk Valley where they will continue to get more snow.

Posted: Apr 27, 2020 12:39 AM

More snowfall than expected, only for the higher elevations.

Seeing rain for most of the Mohawk Valley with temperatures above freezing. However, for the Adirondacks and south of the Mohawk Valley temperatures are colder as you travel up to the higher elevations. This is why they are seeing snow.

Here's how much snow is on the ground Sunday night:

Temperature can make a big difference. For example, Herkimer has nearly no accumulation, but about 25 miles away in Cherry Valley there is around 9" of snow. This is because of the elevation change with colder temperatures in Cherry Valley. Herkimer is at 384' and Cherry Valley is at 2,821'. Here's a photo of the snowfall accumulation from Cherry Valley.

With temperatures at freezing, which is 32°F, this creates heavy wet snow. For every 1 inch of water creates 10 inches of wet snow. To verify this, the Mohawk Valley recieved around 0.5" of rain and most the higher elevations received 5" of snow. The greatest reports were around 9" in the highest elevations, where the temperature is much colder. The colder the temperature, the more snow you can produce with less water. With temperatures in the teens, you can produce almost double the amount of snow. About 20 inches of snow with 1 inch of water.

The reason we are seeing so much snow is because we have an East wind pumping in moisture from the Atlantic. This is falling as rain in the Mohawk Valley, but as snow for the higher elevations with temperatures around or below freezing.

The snow will continue to fall in the Adirondacks and higher elevations south of the Mohawk Valley overnight and into Monday morning. The heaviest snow will be overnight, with light snow throughout the morning. By Monday afternoon, the snow transitions to scattered light rain showers, ending by the evening.

We have a Winter Weather Advisory in effect for Otsego County until 5:00am Monday. This is for heavy wet accumulating snow. The higher elevations of Otsego County can expect an additional 3-6" of snowfall.

From now until 7:00am Monday, here's how much additional snowfall is possible. Keep in mind the highest amounts are for the highest elevations. Most of the Mohawk Valley is only expecting rain.

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