November started out pretty normal for the Arctic. The sun had set for the season, temperatures were dropping, ice was growing rapidly. Winter was coming, right on schedule. And then, a few days ago, everything came screeching to a halt. Ice stopped forming. And then it actually started to melt, thanks to a sudden heat wave that blistered the region with temperatures 20 to 30 degrees Fahrenheit above average. For now, the mass of warm air doesn't appear to be going anywhere.

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