Continental tropical.
Hot, dry and low pressure forms over hot deserts. Known as a tropical continental air mass.
A desert is dry. It does not produce a lot of water vapor. An air mass that forms over a desert will have low humidity.The desert receives an extremely low amount of precipitation (rain, snow, etc. that has fallen at a place in a given period) or lack of water. This would make an air mass that forms over a desert have low humidity (The air mass would not be moist).
A hot air mass that forms over land is called a continental air mass.
Maritime Air Mass
cT represents a continental tropical air mass, which is warm and dry in nature. This air mass typically forms over desert regions and brings hot and dry conditions when it moves to other areas.
mP air mass
An air mass classified as cT usually forms over hot and dry desert or semi-arid regions, such as in the southwestern United States or northern Mexico. It derives its characteristics from being a continental (c) air mass and originating from the tropics (T).
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An air mass that forms over water at high latitude is most likely cold. The air mass over the water would also be quite humid.
Air masses with those characteristics are termed "maritime tropical".