An air mass that forms over a high latitude region. Continental polar air (cP) is formed over cold surface regions and is typically very stable with low moisture. Maritime polar air (mP), produced over warmer waters, is less stable with high moisture.
POLAR AIR MASS
Meaning of POLAR AIR MASS in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012