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Partly to mostly cloudy
Mostly cloudy and colder
Mostly sunny and very cold
Snow or flurries possible
Boston will lie on the northern edge of a 1,500-mile swath of snow, slippery roads and travel disruptions for a time on Thursday. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.