A massive heat dome is expanding across the central United States, pushing temperatures above 100 degrees Fahrenheit from Texas to North Dakota and putting tens of millions of people under heat advisories.

The high-pressure system is trapping hot air across a vast swath of the country, spanning from the desert Southwest to the Gulf Coast, Great Plains, and Midwest. Meteorologists warn that elevated overnight temperatures and high humidity will provide little relief, allowing heat stress to accumulate throughout the week. Highs in areas like Denver and Las Vegas are expected to approach or break long-standing temperature records, while normally moderate regions in Montana and Wyoming could see temperatures surpass triple digits.

Health officials warn that prolonged exposure to extreme heat poses severe risks, particularly for young children, older adults, and outdoor workers. Authorities are urging residents to utilize local cooling centers, stay hydrated, and limit outdoor activities during peak afternoon hours.

Climate experts note that while individual weather patterns are complex, rising global temperatures driven by greenhouse gas emissions continue to make severe and persistent heat waves more frequent and intense.