60 Million Under Heat Alerts as Dangerous Heat Wave Pushes Heat Index Toward 115°F

• Heat Puts US Under Pressure
• Charleston Could See Heat Index of 112°F
• Heat Will Persist Overnight

A heat wave in the southern United States threatens to maintain dangerous temperatures for nearly the entire week, with a heat index that in some cities could approach 115 °F.

Around 60 million people are under heat alerts, as the combination of high temperatures and humidity will maintain difficult conditions from Texas and Oklahoma to the coasts of Georgia and South Carolina.

• Why it matters: the problem won’t end when the sun sets, since nights will remain warm and offer little relief to those without air conditioning or constant access to hydration.
• Key points: the heat will continue until the weekend, some areas will reach extreme levels, and Charleston stands out among the cities where the heat index could far exceed 100 °F.

Charleston and the Southeast Will Face Extreme Heat This Week

Charleston, South Carolina, appears among the points where the heat will be especially intense: the thermometer is expected to hover around 100 °F, with a heat index that could reach approximately 112 °F.

The sweltering conditions will also extend to sectors of Georgia and South Carolina, where the risk associated with high temperatures will increase as the week progresses.

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The National Weather Service considers heat conditions especially dangerous when the combination of temperature and humidity significantly raises the heat index; specific criteria may vary by region.

• The fact: a mass of hot air installed over the southwest has spread to the southeast and, combined with high humidity, will make the body perceive temperatures much higher than those recorded by the thermometer.

Texas, Oklahoma, and the Mississippi Valley Will Also Feel the Impact

The episode will not be limited to the Atlantic coast: temperatures above 100 °F will reach parts of Oklahoma, northern Texas, and the Texas Gulf Coast.

The lower Mississippi Valley will also face particularly dangerous conditions, with areas where the heat risk could reach the extreme category.

• The process: storms that may appear during the afternoons will not offer a lasting drop in temperatures, allowing the heat to accumulate again during the following days.

The stagnation of these atmospheric conditions will maintain the sweltering environment until the weekend, prolonging the exposure of millions of people in much of the southern United States.

Nights Near 80 °F Will Increase Heat Risk

One of the factors that makes this episode especially concerning is the lack of nighttime relief, as minimum temperatures could remain around 80 °F.

When heat persists during the night, people without adequate cooling systems have fewer opportunities to recover after enduring high temperatures during the day.

• The limit: the exact intensity will depend on each location, and conditions can change, so local weather alerts will be crucial to knowing the level of risk for each community.

The National Weather Service’s HeatRisk system evaluates the potential impacts of heat by considering temperatures and health thresholds developed with information from the CDC.

How to Protect Yourself During the US Heat Wave

• What you can do: reducing physical activities during the hottest hours, drinking water frequently, and staying as much time as possible in air-conditioned spaces can decrease exposure.

The National Weather Service also recommends wearing lightweight clothing, avoiding alcoholic beverages during intense heat episodes, and moving strenuous activities to the early morning hours.

Special attention is required for children, older adults, outdoor workers, and people without adequate access to cool places, especially when high temperatures persist for several days.

The extreme heat will continue to be the main factor in much of the South this week, so checking local alerts before working, traveling, or engaging in outdoor activities will be key, according to Fox Weather.