Salt Lake City, Utah — A powerful heat dome that has fueled dangerous temperatures across the central Plains is expected to shift west later this week, bringing extreme heat, increased wildfire danger, and potentially record-breaking temperatures to much of the Southwest and interior California. Forecasters warn that millions could experience the hottest weather of the year as the high-pressure system settles over the region heading into the weekend.
Heat Dome Expands Across the Southwest
Meteorologists say the center of the heat dome is forecast to move over Utah by Friday, allowing intense heat to spread across Arizona, Nevada, Utah, New Mexico, and interior California. Forecast models also suggest the system could shift slightly farther southwest in early August, prolonging the dangerous conditions.
The expansive area of high pressure will suppress cloud development and trap hot air near the surface, causing temperatures to climb well above seasonal averages across much of the West.
Residents are being urged to prepare for multiple days of excessive heat, especially in areas that have already experienced prolonged warm weather this summer.
Los Angeles Could See Unusually Hot Weekend
Southern California is also expected to feel the effects of the strengthening heat dome.
Forecasters say easterly winds could push intense inland heat into the Los Angeles Basin, where afternoon highs well into the 90s are possible next weekend.
For comparison, average highs in Los Angeles during this time of year are typically in the lower 80s, meaning temperatures could run 10 to 15 degrees above normal.
Weather experts noted that while downtown Los Angeles endured an intense heat wave in March 2026, this upcoming event could bring even higher temperatures to some neighborhoods.
Desert Cities Could Experience Their Hottest Days of the Year
The most dangerous heat is expected across the Desert Southwest.
Forecasters predict high temperatures between 110 and 120 degrees in many locations by next weekend, creating hazardous conditions for anyone spending extended time outdoors.
Cities such as Phoenix, Las Vegas, and Palm Springs are all forecast to potentially record their highest temperatures of 2026 so far.
Health experts warn that the danger won’t end after sunset. Exceptionally warm overnight temperatures will limit the body’s ability to recover from daytime heat, significantly increasing the risk of heat exhaustion and heat stroke, particularly among older adults, young children, and those without reliable air conditioning.
Wildfire Threat Expected to Increase
While the North American monsoon typically brings scattered thunderstorms to parts of the Southwest during summer, forecasters expect storm activity to become less widespread as the heat dome strengthens.
Although fewer storms are anticipated, dry lightning strikes remain a concern.
Combined with extreme heat, dry vegetation, and low humidity, any lightning-triggered fires could spread rapidly, increasing wildfire danger through the weekend.
Fire officials may closely monitor conditions as the combination of heat and dry fuels creates an environment favorable for new wildfire starts.
Extreme Heat May Also Impact Air Travel
The unusual heat could affect more than just outdoor activities.
Aviation experts note that extremely hot temperatures reduce air density, meaning aircraft require longer distances to safely take off.
As a result, some airlines may closely monitor passenger and baggage weights during periods of extreme heat, particularly at airports located in high-elevation or desert regions where performance is more heavily affected.
With forecasters expecting dangerous heat to persist into early August, residents across the West are encouraged to stay hydrated, avoid strenuous outdoor activities during peak afternoon hours, and closely follow local weather advisories.
Do you live in an area expected to be impacted by this heat dome? How are you preparing for the extreme temperatures? Share your thoughts in the comments below.
