The area in the United States were cool dry air from the West warm moist air from the Gulf of Mexico and results in an unstable atmosphere

The Golden Gate Bridge

Stone Mountain

Hurricane hallway

Tornado alley

The correct answer is Tornado alley. Tornado alley is an area in the central United States, primarily in the Great Plains region, where cool dry air from the West collides with warm moist air from the Gulf of Mexico, resulting in an unstable atmosphere that is conducive to the formation of tornadoes.