Every winter, here in eastern Massachusetts, we are visited by Nor’easters. Each storm is plotted on weather maps days in advance. A low pressure area swoops down from the Rockies, gathers moisture in the Gulf of Mexico, rides up the east coast over the warm waters of the Gulf Stream and then stalls in the Gulf of Maine, churning itself into its full intensity. Every storm has the potential to turn into a blizzard. But whether it does or not depends on two things: First, what is the exact track of the center of the storm and second, how much cold air is in place before the storm arrives?

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