It's been happening for several years now, especially in the autumn, but it never ceases to unsettle meteorologists like myself: Temperatures in the Arctic are astonishingly warmer than they should be. According to the University of Maine's Climate Reanlayzer, this weekend the Arctic Circle was an average 12 degrees Fahrenheit above normal. "It's all but becoming an annual reminder of the rapid climate change we have observed in the Arctic," explains Dr. Zack Labe, an Arctic climate specialist from Colorado State University. While the pace of global warming is the fastest we have seen in millions of years, nowhere is...