Intense Heat Wave Poses Growing Health Risks Across the U.S.

The coming days will bring intensified health risks due to another week of intense heat. Even overnight temperatures will offer little relief. The National Weather Service forecasts that over 90 temperature records could be tied or broken across the U.S. by Wednesday. Most of these will be overnight heat records.

Health experts emphasize the danger of overnight temperatures that remain high, as they can be more harmful than soaring daytime heat. The sweltering start to summer, driven by a persistent heat dome, has already led to heat-related fatalities in New Jersey and sparked wildfires in the West.

No Relief from Nighttime Heat

Temperatures are not expected to dip below 80°F (27°C) at night in areas such as Fort Lauderdale, Miami, Tampa, Galveston, and Charleston, according to the National Weather Service. Regions in the Midwest and Northeast, typically known for cold winters, will see nighttime temperatures stay above 70°F (21°C), impacting locations like Fargo, International Falls, and Portland.

High Nighttime Temperatures: A Greater Threat

Health professionals warn that persistent high overnight temperatures are perilous. They leave no opportunity for the body’s core temperature to cool and recover. Marshall Shepherd from the University of Georgia notes that this significantly enhances health issues, particularly in the elderly and vulnerable groups. Even a small increase in body temperature can result in heatstroke or unnecessary cardiac stress.

Delayed Health Risks

Krisite Ebi, a climate scientist at the University of Washington, states that the effects of unrelieved nighttime heat surfaces the next day. She notes, “Mortality starts the second or third day” due to the body’s inability to cool down.

Staying Proactive During a Heat Wave

Early signs of heat stress include excessive sweating, muscle cramps, and headaches. “It’s difficult to recognize heat strain,” Ebi advises. “Being proactive is essential.” Cooling methods, such as air conditioning or a cold towel, are crucial.

Checking on friends and relatives is also vital, especially those who are older, pregnant, or challenged by health conditions that might struggle with heat.

Cooling Methods Without Air Conditioning

Even without air conditioning, relief is possible. Visiting a library or mall is helpful. Use a fan and mist water on your skin, or immerse your feet in cold water. Wet clothes can provide comfort. Hydration is key, so ensure to drink plenty of water.

Associated Press reporter Seth Borenstein contributed to this report.