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Air masses affect climate in the same way mountains or mountain barriers do.
The source region for the maritime tropical air mass originate over the warm waters of the southern Atlantic Ocean and the Gulf of Mexico.
Mountains are large high land masses.
Rain Shawdow Effect
The Hudson Bay is not an area where the maritime tropical air masses that affect north America originate.
Dry air masses come off the Rocky Mountains as a result of the rain shadow effect. When this plows into warm, moist air from the Gulf of Mexico it creates a dry line. The dry air lifts the less dense moist air, which triggers powerful thunderstorms. These thunderstorms have the potential to produce tornadoes.
high-pressure belts
Chocolate grows in the masses
It is masses that cause gravity in the first place.
Some maritime tropical air masses originate in the subtropical Pacific Ocean, where it is warm and air must travel a long distance over water. These rarely extend north or east of southern California. Some maritime tropical air masses originate over the Gulf of Mexico and Caribbean Sea. They can be associated with fog and low clouds as they moves northward. In the spring and summer, this air mass accounts for the thunderstorms in the Great Plains and elsewhere.
Two land masses crunching together will form mountains E.g. Himalayas
Tornadoes in the United States are generally associated with collisions of air masses. In mmany cases there is a warm, moist air mass that originates over the Gulf of Mexico. This meets a cool air mass from Canada, a warm, dry air mass from the Rocky Mountains, or both.