An air mass that forms in the north atlantic ocean in winter over cold water and then comes ashore is a continental polar air mass.
An air mass is a volume of air that in meteorology is identified by its temperature and humidity. Many hundreds or thousands of square miles are covered by air masses, which adjust to the properties of the land underneath them. Latitude and their continental or maritime source regions are used to categorise them. Warmer air masses are referred to as tropical, whilst colder air masses are referred to as polar or arctic. Superior and maritime air masses are moist, whereas continental and superior air masses are dry. Weather fronts divide air masses with various properties of density, temperature, or moisture.
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