Washington Post - “It’s about 20C [36 degrees Fahrenheit] warmer than normal over most of the Arctic Ocean, along with cold anomalies of about the same magnitude over north-central Asia,” Jennifer Francis, an Arctic specialist at Rutgers University, said by email.
“The Arctic warmth is the result of a combination of record-low sea-ice extent for this time of year, probably very thin ice, and plenty of warm/moist air from lower latitudes being driven northward by a very wavy jet stream.”
Francis has published research suggesting that the jet stream, which travels from west to east across the Northern Hemisphere in the mid-latitudes, is becoming more wavy and elongated as the Arctic warms faster than the equator does...
Abnormally warm air has flooded the Arctic since October. Richard James, a meteorologist who pens a blog on Alaska weather, analyzed
19 weather stations surrounding the Arctic Ocean and found that the
average temperature was about 4 degrees (2 Celsius) above the record set
in 1998.
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