During a negative phase of the AO, the polar vortex over the Arctic is weaker, resulting in a slackening of the upper level winds ringing the Arctic from west-to-east. This can allow frigid ...

According to AccuWeather a blast of Arctic air will grip much of the eastern and central ... with the possibility of a snowstorm developing in the early part of the week. A polar vortex is a large ...

For the scientists aboard the Norwegian Polar Institute's research vessel Kronprins Haakon, these fleeting encounters were the culmination of months of planning and decades of Arctic fieldwork.

For the scientists aboard the Norwegian Polar Institute's research vessel Kronprins Haakon, these fleeting encounters were the culmination of months of planning and decades of Arctic fieldwork.