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A large high-pressure zone over Greenland is expected to create a phenomenon known as the "Greenland block," so named because it blocks the usual path of the Northern Hemisphere's jet stream, later this month. A Greenland block redirects the jet stream southward, often creating colder (and often wetter) conditions on the East Coast of the U.S. Most of the Washington, DC area's biggest snowstorms, including the 2009 "Snowpocalypse" storm that dumped about two feet of snow in 24 hours, resulted from a Greenland block. www.washingtonpost.com/weather/2022/11/29/greenland-block-snow-dc-midatlantic/
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