A blast of Arctic air straight from Siberia is poised to spread across the continental U.S. around Christmas, shattering records and potentially spinning up major storms.
Computer model map showing temperature departures from average in °F on Dec. 23. Image: Weatherbell.com
The end result may revive talk of more extreme cold as a paradoxical effect of human-caused global warming since the Arctic will wind up milder than average while the lower latitudes freeze. There is an unusually powerful area of high pressure over Greenland, known as the Greenland Block, which enhances the odds of cold and snow in Europe and the U.S.
Next, the final key piece will move into place: An area of high pressure across eastern Siberia and Alaska that will funnel frigid air across the Arctic and into the U.S.Recently, the astonishing cold has been building up in Siberia, with temperatures as low as -61°C recorded this week. That air mass will slither toward the U.S., moderating some as it does so.
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