Western US heat dome brings dangerously hot temperatures to tens of millions | CNN

An unusually intense heat dome is bringing dangerous temperatures to parts of the West on Sunday, where about 45 million people are under heat alerts. Most of those people are in portions of California, Nevada and Arizona, although heat alerts stretch north to the Canadian border. 🥵 Get your heat forecast in the CNN Weather app Heat waves are getting more dangerous with climate change — and we may still be underestimating them Extreme heat is the number one weather-related killer in the US each year, according to the National Weather Service. One factor that makes heat so dangerous is when temperatures remain elevated at night, and in Phoenix and Las Vegas in particular, low temperatures will only reach the upper 80s and low 90s. Temperatures this high will rob peoples’ ability to cool down and rest if they don’t have access to cooling, increasing the likelihood of heat-related illness. When extreme heat risk is present, it indicates the heat could be deadly, particularly to those without cooling access. Extreme heat risk also means that health systems are likely to see increased demand, including with visits to the emergency room for heat-related illness. While the heat w