Polar vortex brings springtime snow to the U.S. East Coast

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The polar vortex dumped snow and cold Arctic air on parts of the northeast United States and Canada over Mother's Day weekend, the Associated Press reports.

According to the National Oceanic and Atmospheric Administration, the polar vortex is a band of low pressure Arctic air normally centered around the North Pole. It is located in the middle and upper tropospheres and extends into the stratosphere.

The polar vortex is usually held in place by a current called the jet stream. Disturbances in the jet stream can push frigid, wintry air to parts of Canada and the U.S., while high-pressure systems of warmer air bulge northwards elsewhere.

RUNDOWN SHOWS:
1. Polar vortex seen from above the North Pole
2. Polar vortex extends from stratosphere to middle of the troposphere
3. Polar vortex bulges due to disturbances in the jetstream
4. Polar vortex brings unseasonably cold temperatures and rare winter snow

VOICEOVER (in English):
"The polar vortex unleashed frigid temperatures and rare snow on parts of the northeast United States and Canada over Mother's Day weekend."

"The polar vortex is a band of low pressure Arctic air normally centered around the North Pole. It is located in the middle and upper tropospheres and extends into the stratosphere."

"The polar vortex is held in place by a current called the jet stream. Disturbances in the jet stream can push frigid, wintry air to parts of Canada and the U.S., while high-pressure systems of warmer air bulge northwards elsewhere."

"On Mother's Day weekend the wobbly polar vortex dumped freezing temperatures on parts of the Midwest and eastern U.S., with springtime snow falling in parts of New York and New Jersey."


SOURCES: National Oceanic and Atmospheric Administration, Associated Press, Live Science, CTV News, Fox News
https://www.noaa.gov/multimedia/infographic/science-behind-polar-vortex-you-might-want-to-put-on-sweater
https://www.ny1.com/nyc/all-boroughs/ap-top-news/2020/05/09/polar-vortex-brings-rare-may-snow-low-temps-to-us-east
https://www.livescience.com/extreme-may-weather-polar-vortex.html
https://barrie.ctvnews.ca/polar-vortex-shatters-record-temperatures-across-the-region-1.4935839
https://www.foxnews.com/us/polar-vortex-may-snow-maine-power-outage-low-temperature-records-broken-east