08/29/2026
Arizona and Utah may have some problems.
SOUTHWEST FLOOD RISK THIS WEEKEND⚠️a significant increase in monsoon thunderstorm activity is expected across Arizona and Utah, extending into parts of Nevada, New Mexico and Colorado this weekend, bringing a growing risk of flash flooding from Saturday into Sunday. Deep monsoonal moisture will surge northward as high pressure shifts east and a trough moves through the western U.S. In southern and southeastern Arizona, atmospheric moisture is expected to become quite high, with precipitable water values reaching 1.3-1.7 inches. Some thunderstorms could produce extremely heavy rainfall rates of 1-3 inches per hour. One important concern is that thunderstorms may continue well into the overnight hours Saturday and Sunday, rather than quickly fading after sunset. Repeated rounds of storms and the potential for training thunderstorms could result in locally significant rainfall. The greatest flood concerns will be around burn scars, slot canyons, normally dry washes, low-water crossings, urban areas and other flood-prone locations. Rivers, creeks and streams could also rise quickly. This will not be an all-day washout everywhere, but where thunderstorms repeatedly track over the same locations, rainfall totals could add up very quickly. Anyone hiking, camping or traveling through flood-prone terrain across Arizona and Utah this weekend should closely monitor conditions⚠️