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The source region for the maritime tropical air mass originate over the warm waters of the southern Atlantic Ocean and the Gulf of Mexico.
the gulf of mexico
It originates in the Gulf of Mexico and is Martitime tropical (a kind of air mass).
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.
You need warm, moist air from the Gulf of Mexico and cool, dry air from Canada. When these two air masses meet, they create instability in the atmosphere.
The colliding air masses in Tornado Alley are warm, moist air from the Gulf of Mexico, cool air from Canada, and dry air from the Rockies. This collision is just part of the recipe for tornadoes.
The Gulf of Mexico provides warm, moist air.
The Hudson Bay is not an area where the maritime tropical air masses that affect north America originate.
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.
Because of the location.
high-pressure belts
The maritime tropical air mass forms over the Gulf of Mexico.