Which area is the source region for a warm and moist (mT) air mass?

The Gulf of Mexico serves as a source region for warm and moist (mT) air masses due to its geographic and climatic conditions. Warm, moist air masses are characterized by their formation over large bodies of water, where evaporation adds significant moisture to the air. The Gulf of Mexico, being a warm body of water, not only has higher temperatures but also ample humidity which influences the air masses that form in that area.

In addition, the warm water of the Gulf heats the air above it, causing it to rise and flow outwards, often leading to the development of mT air masses. These air masses can then move northward, influencing weather patterns across the eastern United States, especially during certain seasons.

Other regions mentioned, such as Central Canada, primarily produce cold and dry air masses due to their cooler temperatures and lack of significant moisture sources. The Eastern United States might experience influences from mT air masses, but it is not the source region; instead, it is typically the area where these air masses move into and affect the weather. The West Coast of the US can influence air masses but is generally associated with maritime polar (mP) air, which is cool and moist rather than warm and moist.