As Independence Day celebrations kick off, millions of Americans in much of the central and eastern United States are under extreme heat warnings. More than 68 million people are currently under active National Weather Service heat alerts, while roughly 165 million are expected to face major or extreme heat-related health risks through the holiday weekend.

Heat Wave Details

A strong upper-level ridge – commonly referred to as a heat dome – remains anchored across the central and eastern U.S., fueling temperatures between 95 and 105 degrees. Combined with high humidity, heat index values are expected to reach 100 to 115 degrees across large swaths of the country.

Forecasters said numerous temperature records are expected to be broken on Friday and Saturday, with some locations at risk of consecutive-day, monthly and all-time record highs. The National Weather Service warned that one of the most dangerous aspects of the heat wave is a lack of overnight relief.

Low temperatures are expected to remain in the 70s to near 80 degrees in many areas, allowing little opportunity for people or buildings to cool down. Extreme heat warnings and heat advisories will remain in effect across much of the eastern half of the country through Friday and Saturday.

The National Weather Service noted that prolonged periods of extreme heat are among the deadliest weather hazards, especially on a holiday weekend when many people spend time outside. To stay safe, individuals are advised to limit time outdoors, stay hydrated, and ensure access to air conditioning or cooling centers.

Original reporting: KTBS 3 (Shreveport) — read the source article.