A heat dome and wildfire smoke are expected to affect large parts of the United States, bringing prolonged and potentially dangerous conditions. The heat wave is associated with unusually high temperatures and humidity, while smoke from wildfires is contributing to reduced air quality in some areas.
More than 100 million people are under heat alerts, according to coverage of the event, with roughly half the country experiencing the heat wave. Forecasters and officials are warning residents to limit exposure to the heat, stay hydrated and take precautions, particularly during the hottest parts of the day.
The combination of high temperatures, humidity and wildfire smoke is creating overlapping health risks. People with existing health conditions, older adults, children and those who work or spend extended periods outdoors may face greater danger from heat-related illness and poor air quality.
Storms accompanying the broader weather pattern have also disrupted travel, with flights grounded in some areas. Conditions are expected to remain challenging as the heat wave continues, while smoke levels and storm activity vary by location.
This overview was compiled with AI assistance based on wire coverage of this story — see the original report below.