EXCESSIVE HEAT IN THE SOUTHWEST

Heat Outlook

Dangerous heat will continue across the Desert Southwest today and tomorrow as a strong ridge of high pressure remains firmly in place. Afternoon temperatures will climb well above 110°F across many lower-elevation locations, including Phoenix, Tucson, Las Vegas, and Palm Springs. Even higher-elevation communities, such as Prescott, will experience well above-normal temperatures, although readings there will not be as extreme as those in the desert valleys.

These temperatures are expected to run roughly 10 degrees or more above seasonal averages, creating dangerous conditions for anyone spending extended time outdoors. The prolonged heat will significantly increase the risk of heat-related illnesses, especially during the afternoon and early evening hours when temperatures are at their highest.

Little relief is expected over the next several days, and as the upper-level ridge strengthens, the excessive heat may persist into next week. While isolated afternoon thunderstorms associated with the North American monsoon may develop over the surrounding mountains, they are unlikely to provide widespread cooling for the desert communities.

Residents and visitors should take precautions by staying well hydrated, limiting strenuous outdoor activities during the hottest part of the day, checking on vulnerable individuals, and never leaving children or pets unattended in vehicles.

Overall, the Desert Southwest will remain under a prolonged period of dangerous heat through at least the next several days, with some areas likely to experience temperatures exceeding 110°F each afternoon.