Acontinental tropical air mass formed over the southwest u. s. this area is called its home region mass region source region front region

The answer to your question is Source region.

front region

Explanation:

As the continental tropical air mass is formed over the southern western U.S the area forms a source for the mixing of the two different and contrasting fonts to meet and interact and form two frontal regions of distinct characteristics and their interactions give rise to the cyclone and hurricanes and other temperate storms that prevail in this region. As this air mass is hot and dry thus brings the dryness in the western side of California and other states and drives the col and cold waters farther away.

Answer the use of flood plains and irrigation;