A bitter wind has been blowing over parts of North America, Europe and Asia. Some places have been colder than ever, like Melbourne, Fla., which dipped to 28 degrees last Thursday, a record low. Europe has been walloped by snowstorm after snowstorm.
What’s going on? Global cooling?
Nope. A mass of high pressure is sitting over Greenland like a rock in a river, deflecting the cold air of the jet stream farther to the south than usual.
This situation is caused by Arctic oscillation, in which opposing atmospheric pressure patterns at the top of the planet occasionally shift back and forth, affecting weather across much of the Northern Hemisphere.
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