arctic air

views updated May 08 2018

arctic air Very cold air mass, generally formed north of the Arctic Circle. As air from this source moves southwards, it cools the regions in which it arrives; but being itself heated in the process it becomes convectively unstable. Polar lows sometimes form and the accompanying wintry precipitation is often heavy.

Arctic air

views updated May 21 2018

Arctic air A very cold air mass, generally formed north of the Arctic Circle. As air from this source moves southwards, it cools the regions in which it arrives; but being itself heated in the process it becomes convectively unstable. Polar lows sometimes form and the accompanying wintry precipitation is often heavy.