NWS Forecast Office Phoenix, AZ

Isolated to scattered thunderstorms will form over higher terrain of eastern Arizona, as well as southern Arizona with a high likelihood of multiple outflow boundaries with strong, gusty winds Saturday evening. Areas of dense blowing dust are likely along I-8 in Pinal County with chances of dust reaching into Maricopa County and the Phoenix area.

Scattered to numerous thunderstorms will form over southern and eastern Arizona Sunday afternoon sending multiple outflow boundaries into south-central Arizona. The atmosphere will be favorable for additional development of storms along and behind these boundaries impacting lower elevation communities during the late afternoon and evening. There is a marginal risk of severe weather with strong winds in excess of 60 mph, dense blowing dust, small hail, and locally heavy rainfall all possible. While storms will begin weakening Sunday evening, some impacts may continue well into western Arizona and southeast California into the overnight.

High pressure over the region will keep high temperatures well-above normal today leading to widespread Moderate HeatRisk with areas of Major HeatRisk. A very gradual cooling trend is expected by this weekend. Practice smart heat safety by drinking plenty of water and electrolytes and reducing your time outside during the afternoons.

Even temperatures common for the summer months in the desert southwest can be dangerous without taking the proper precautions. Please consider these tips if spending extended time outdoors during daylight hours.