Air masses most often originate in mid latitudes is not true in characterizing an air mass.
A large body of air with related to the right temperature and humidity is referred to as an air mass. The characteristics of an air mass are determined by the area from which it originates. The longer the air mass remains over its initial location, the more probably it will acquire surface properties. The heat and moisture character traits of their source regions are used to classify air masses. Temperature classifications include tropical (warm), polar (cold), and arctic (extremely cold).
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