In mid-July 2026, parts of Montana, Utah, and Wyoming experienced a relentless heat dome that shattered decades-old temperature records, bringing intense heat and health concerns to the western United States.
- Heat dome raised temperatures to record highs above 110°F
- Heat-related emergency visits surged tenfold in Mountain states
- Heat waves in the U.S. have doubled since 1980
What happened
A strong ridge of high pressure settled over the northern Rockies during the weekend of July 11-12, 2026, creating what meteorologists call a heat dome. This phenomenon traps hot air near the surface and blocks cloud formation, allowing intense sunlight to heat the ground and air above it. As a result, temperatures in Montana, Utah, and Wyoming soared to record-breaking levels, with some locations exceeding 115°F.
Airports in Billings and Miles City, Montana, along with Sheridan, Wyoming, each recorded new all-time temperature highs, some surpassing previous records by up to 4°F. Across Utah, places like Salt Lake City and Deseret also saw historic heat, with temperatures reaching as high as 111°F. These records, some dating back over a century, highlight the extraordinary nature of this heat wave.
Why it feels good
While extreme heat can be dangerous, the occurrence of heat domes gives scientists and meteorologists an opportunity to better understand atmospheric patterns and climate dynamics. Monitoring such events helps improve weather prediction models, contributing to enhanced preparation and response strategies for future heat waves.
Additionally, the heat dome underlines the importance of timely climate data and satellite technology, like NASA’s GEOS model and Earth-observing satellites, which provide valuable insights into how weather phenomena develop and evolve. This knowledge is crucial for protecting vulnerable communities and improving public health responses.
What to enjoy or watch next
Forecasters anticipate that the heat dome will move eastward, bringing potentially record-setting temperatures to parts of the Midwest, New England, and Mid-Atlantic regions. Residents in these areas should prepare for the impact of soaring temperatures in the coming days.
Heat waves are increasing in frequency across the U.S., doubling in number since 1980 according to NASA research. Watching how these patterns develop and how communities adapt will be key to managing the challenges posed by extreme heat. Globally, similar heat waves are affecting Western Europe and parts of Asia, connecting local experiences to broader climate trends.