Meteorology · Air Masses — Source Regions
A maritime polar (mP) air mass affecting a coast is typically:
- AWarm and moist from the tropics
- BHot and dry from a desert
- CCool and moist, having formed over cold ocean waters at high latitudes✓ Correct
- DWithout any moisture
Explanation
Air masses are named for their source: maritime (m, moist) or continental (c, dry), and polar (P, cold) or tropical (T, warm). Maritime polar air is cool and moist, often bringing showery, unstable weather as it warms over a coast. Continental polar (cP) is cold and dry.
Authority: Bowditch (Pub. No. 9), Air Masses
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