polar vortex, coldest of Arctic

Maps show what to expect as the cold front arrives. The polar vortex is a large area ... During the winter months and when the jet stream allows, this cold air can drop farther down into lower ...
A cooler day is expected as clouds continue to hang over the region. A polar jet stream from the north has dropped into the continental United States, bringing cooler air and chances for snow showers ...
WASHINGTON, Jan 21 (Reuters) - In Earth's upper atmosphere, a fast-moving band of air called the jet stream blows with winds ... degrees Celsius), with its polar regions less hot than the rest.
It’s been warmer in Alaska than in three dozen other states. If someone asked you, “Where can I go in the United States to ...
Maps show what to expect as the cold front arrives. The polar vortex is a large area ... During the winter months and when the jet stream allows, this cold air can drop farther down into lower ...