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Heat Wave Alert: Nighttime Temps Bring Health Risks

United StatesTuesday, July 14, 2026

This summer is shaping up to be one for the record books, with scorching temperatures expected to continue across much of the US. A lingering heat dome is to blame for the sweltering heat, which has already led to heat-related deaths and fueled wildfires.

The National Weather Service is predicting that over 90 temperature records will be tied or broken this week, with many of those records occurring at night. In cities like Fort Lauderdale, Miami, and Tampa, nighttime temperatures aren't expected to dip below 80F. Even in areas known for chilly winters, like Fargo, North Dakota, and Portland, Maine, nighttime temps will remain above 70F.

Health experts warn that these high overnight temperatures pose a significant threat, particularly to vulnerable populations like the elderly. When the body can't cool down at night, the risk of heatstroke and heart strain increases. Just a few degrees of increased body temperature can be life-threatening. The danger of heat can sneak up on you, with health risks often showing up the next day.

That's why it's crucial to be proactive and take steps to cool off. Early warning signs of heat-related illness include heavy sweating, muscle cramps, and headache. If you're struggling to stay cool at home, try visiting a library or mall, or find ways to cool off like spraying water on your skin or soaking your clothes. And don't forget to check in on friends and family who may be more susceptible to the heat.

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