TUCSON (AP) — Much of southern and south-central Arizona will be under flash flood watches from Tuesday afternoon through Wednesday evening as tropical moisture associated with Hurricane Newton flows into the region.
The U.S. National Hurricane Center predicted the storm would make landfall in the Mexican state of Sonora still a hurricane. After passing over relatively little populated areas in Sonora, Newton could push into southeastern Arizona as a tropical storm at midday Wednesday, and drop 1 to 3 inches of rain over parts of Arizona and New Mexico through Thursday, forecasters said.
"Heavy rain could cause life-threatening flash floods and mud slides, especially in mountainous terrain," the center said.
Watch areas includes Phoenix, Tucson, Sierra Vista, Nogales, Safford and Glove, and forecasters say flash flooding in normally dry washes and low-lying areas will be possible from numerous showers and thunderstorms.
Northern Arizona will be on the northwestern edge of the remnants of Newton. The greatest threat for heavy rainfall and flash flooding will be Wednesday over southern Navajo and Apache Counties, as well as adjacent portions of Gila County.
Thursday may see a few storms in northern Arizona before a transition back to dry weather for the weekend.