Forget the Valentine’s Day roses if you’re stuck in the Northeast this weekend — give your sweetie a sweater instead. They’ll need it.

A “life threatening” icy blast is expected to put a big chill on the romance for millions of Americans with the coldest temperatures to hit the region in over a decade, forecasters warned Friday.

The National Weather Service said the mercury will start dipping Saturday, but the coldest air would not arrive until Sunday morning — with several cities facing the prospect of subzero temperatures.

Boston’s forecasted low of 2 below zero looked relatively balmy compared to the outlook for…

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