Hurricane Rosa will move into the Southwest next week and produce heavy rains that will result in flash flooding. The areas that will be hit the hardest will be Arizona, southern California, Utah and southern Nevada. That area will see 1-6 inches of rain depending on the exact track of Rosa.
Rosa will hit Baja as a strong hurricane and maybe still a tropical storm as it moves into Arizona.
In addition to the heavy rains, Rosa will produce thunderstorms and even severe weather in the form of high winds and a few tornadoes.
NHC Track Map