Widespread snowfall totaling 4 to 6 inches is expected through Wednesday, with isolated higher amounts along the North Shore.

A winter storm watch is usually issued when a storm system is one to two days from starting. This long lead time is used to help you get ready if you have to make travel or work changes. Eventually as the storm gets closer, the winter storm watch either turns to a winter storm warning or a winter weather advisory.

According to WXCharts maps, snow will start to fall from 3am on the morning of Sunday, February 16, stretching from Stornoway in the Scottish Highlands to Manchester