Forgive me, but "Santa Anna" should read "Santa Ana"
The Santa Ana is a hot, dry, dusty wind in southwestern California that blows westward through the canyons toward the coastal areas during spring and late fall. The wind has its origin in the relatively stable, high-pressure weather system called the Great Basin High that usually exists over southern Idaho, Utah, Nevada, and eastern California. The Great Basin High is characterized by a slow but giant clockwise flow of air that is prevented from expanding eastward by the Rockies and westward by the Sierras.