The thunderstorms could bring heavy rainfall, which may lead to localized flooding in areas like Scottsdale, St. Johns, and Tucson. High humidity levels and the potential for heavy downpours may also cause reduced visibility and slippery road conditions, posing risks for drivers. Outdoor activities may be disrupted, especially in areas with a 100% chance of precipitation, such as Sedona and Winslow. Residents in affected areas should remain cautious and monitor local weather updates for any changes.