"Tornado Alley

The Midwestern United States is home to "Tornado Alley," a portion of Texas, Oklahoma, Kansas, and Nebraska commonly plagued with powerful and plentiful tornadoes. Tornado Alley is located at a point where the jet stream drives cool, dry, high-pressure air masses from the deserts and mountains of the West toward the East Coast."

When the cool, dry, high-pressure system moves into "Tornado Alley", which type of air mass does it run into where a tornado could be the result?

When the cool, dry, high-pressure system moves into "Tornado Alley," it typically encounters warm, moist, low-pressure air masses from the Gulf of Mexico. The clash between these two contrasting air masses creates an unstable atmospheric condition, which increases the likelihood of severe weather including tornado formation.