A significant heat wave is poised to bring record-breaking temperatures to large swaths of the Western United States this weekend, as a phenomenon known as a 'heat dome' traps intense heat close to the ground.
The ridge of high pressure is expected to affect areas from Arizona to Montana, with meteorologists cautioning that the extreme conditions could pose a danger to residents. While the heat is anticipated to be relatively short-lived, its intensity is a primary concern.
Cities such as Las Vegas, Phoenix, and El Centro, California, are forecast to experience some of the hottest temperatures of the year. Las Vegas is anticipating a high of 115 degrees Fahrenheit (46 degrees Celsius) on Saturday, with the mercury expected to reach 114F (45.5C) on Sunday. Phoenix could see temperatures climb to 116F (47C), while El Centro is projected to hit a record 118F (48C).
Even areas further north are not exempt from the scorching conditions. Great Falls, Montana, is forecast to reach a record 104F (40C).
The danger is compounded by high overnight low temperatures, with readings expected in the upper 80s to low 90s. This lack of relief overnight prevents bodies from recovering, according to National Weather Service meteorologist Morgan Stessman, who noted that "There’s just no relief overnight."
In addition to the immediate health risks associated with extreme heat, the dry conditions and high temperatures are heightening the risk of wildfires in regions already susceptible to blazes. Fire officials are urging caution in areas experiencing or expecting extreme heat.