EXCESSIVE HEAT IN THE SOUTHWEST

Dangerous heat will continue across the Desert Southwest as a strong ridge of high pressure remains firmly established over the region. Afternoon temperatures will once again climb to 110°F or higher across many lower-elevation areas of Arizona, southern Nevada, and the desert regions of southeastern California.

This prolonged stretch of excessive heat is expected to continue through the remainder of the week, with little day-to-day change. Residents and visitors should continue to take heat precautions by staying well hydrated, limiting strenuous outdoor activities during the hottest part of the day, and seeking air-conditioned environments whenever possible.

Looking farther ahead, forecast guidance suggests the persistent western ridge may begin to weaken or shift later in the season. If that occurs, the Southwest could transition to a more active weather pattern during the fall, bringing more frequent storm systems and increased opportunities for rainfall. However, confidence in the details naturally decreases at longer time ranges, and the exact timing and magnitude of any pattern change remain uncertain.

As we move into autumn and eventually winter, a strengthening El Niño may increase the likelihood of wetter-than-average conditions across portions of the southern United States, including parts of the Desert Southwest. While that raises the potential for beneficial rainfall and mountain snowfall later in the year, the exact impacts will depend on how the large-scale atmospheric pattern evolves over the coming months.

For now, the immediate concern remains the dangerous and persistent heat across the Desert Southwest, where temperatures above 110°F will continue to create hazardous conditions through at least the next several days.