December 29, 2016

As cold air filtered into the United States over the Great Lakes, the lake effect snow machine turned on burying nearby locations.

March 11, 2016

For the third winter in a row, temperatures were well above normal for much of Alaska, leaving Alaskans to wonder, where's winter?

February 24, 2015

A stalled atmospheric set-up has made Boston and surrounding areas in the Northeast the most popular truck stop for storms travelling the atmospheric highway known as the jet stream. And stop they have, like a caravan of tractor-trailers idling in a rest stop parking lot.

January 20, 2014

The Arctic Oscillation describes simultaneous, geographically “choreographed” shifts in multiple features of the polar vortex: air pressure, temperature, and the location and strength of the jet stream. They all follow the hemisphere-wide oscillation of atmospheric mass back and forth between the Arctic and the middle latitudes, sort of like water sloshing in a bowl.

January 8, 2014

Meteorologists have known for years that the pattern of the polar vortex determines how much cold air escapes from the Arctic and makes its way to the U.S. during the winter. Climate scientists are wondering if a warmer Arctic could explain its odd behavior in recent years.

October 23, 2017

The Climate Prediction Center's Mike Halpert dives into the 2017-2018 winter outlook, and talks about how La Niña winters today are different from La Niña winters of the past. 

Forecasters at NOAA’s Climate Prediction Center released the U.S. Winter Outlook today, with La Nina potentially emerging for the second year in a row as the biggest wildcard in how this year’s...

NOAA’s Climate Prediction Center will host a media teleconference to announce the U.S. temperature and precipitation outlook for winter – December through February – and to discuss the latest...

December 21, 2016

How does La Niña and the jet stream impact winter conditions in the United States?

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