.9 Tornadoes
Which states are lumped together to form Tornado Alley

generally, a tornado alley map starts in central Texas and goes north through Oklahoma, central Kansas, and Nebraska and eastern South Dakota, sometimes doglegging east through Iowa, Missouri, Illinois, Indiana, to western Ohio.

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.