The primary risks include large hail, damaging winds, and potential tornadoes in northern Arizona. Baseball-sized hail has already been reported in the Phoenix area, posing a significant threat to vehicles, roofs, and outdoor structures. Flooding is a major concern, particularly in areas under flood watches, such as Phoenix, Glendale, and Scottsdale. Northern Arizona faces additional risks from tornadoes, with warnings issued for areas like Coconino and Navajo counties. Residents in these regions should remain vigilant and prepared for rapidly changing weather conditions.