(WWLP) – The snow has stopped falling in the Berkshires, but it was a big winter storm for some- while others had just a few flurries. Why was there so big of a difference over just a few miles?
It is all caused by the upsloping and downsloping effect. When you have low-level moisture coming up to hills or mountains, such as the Berkshires, that air is forced to rise. The rising air cools and condenses, forming snow- in this case, lots of it. That snow continues falling into the hills until it gets to the other side. The air then sinks into the valley.
That sinking process warms and dries the air, ending the snow. This causes somewhat of a “shadowing” effect; keeping valley areas dry.