Definitions for "Polar low"
a small, but fairly intense maritime cyclone that forms poleward of the main baroclinic zone (the polar front or other major baroclinic zone)
A small depression, usually without fronts, which forms in polar air at high latitudes, chiefly during the winter. They often bring heavy snowfall.
small, shallow depression which forms mainly in winter over some high-latitude seas within a polar or arctic air mass; its motion is approximately the same as the air stream in which it is embedded.