It mightn’t be quite a case of the flapping of a Brazilian butterfly’s wings causing a tornado in Texas, but a team of climate researchers has found a correlation between melting Arctic sea ice and the formation of tornadoes in the United States, with fewer tornadoes being reported when northern sea ice is unseasonably low.

"A relationship between Arctic sea ice and tornadoes in the US may seem unlikely," says study co-author Jeff Trapp, an atmospheric sciences researcher with the University of Illinois at Urbana. "But it is hard to ignore the mounting evidence in support of the connection."
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An mass of cold Arctic air has descended from the north over the continent, causing temperatures to plunge across Canada and the eastern half of the United States. Many regions between Nunavut and Ontario are seeing temperatures well below zero — Fahrenheit, that is (-32ºC), cold enough to crack windows in Alberta and Saskatchewan. Although low-temperature records in many regions aren’t being broken, these conditions are encroaching on century-old records for the duration of regional cold snaps.
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A mysterious pinging sound has been reported over the past year coming from the waters of Fury and Hecla Strait in Canada’s Nunavut territory. The sound, apparently readily detectable by sonar equipment, is being blamed for a sudden scarcity of marine wildlife, normally-abundant in the channel that runs between the western end of Baffin Island and the mainland.
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Despite a cool, cloudy summer, the ice levels in the Arctic have shrunk enough to tie with the second-lowest Arctic sea ice minimum, recorded in 2007. "Historically such weather conditions slow down the summer ice loss, but we still got down to essentially a tie for second lowest on the satellite record," reports US National Snow and Ice Data Center (NSIDC) director Mark Serreze.
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