The Southwest U.S. is facing "significant" risks of heavy rainfall and flash flooding from Tropical Storm Priscilla and another storm system that's set to move in over the weekend, forecasters warn.
Why it matters: Rains from the former Category 2 Hurricane Priscilla are set to lash much of the Southwest, including some of the driest areas of the U.S., and flood watches were in effect for much of Arizona, including Phoenix and Flagstaff, and for parts of Southern California, Nevada, Utah and Colorado.
