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Story summary
- The U.S. National Weather Service reported Miami tied its all-time high of 100°F on August 19, 2026.
- The heat index reached 107°F, indicating dangerous humidity levels.
- More than 72 million people were under heat alerts across the region, officials said.
- A stalled heat dome produced the heat wave that stretched from Texas to the Southeast.
- Researchers attributed about 80 extreme humid-heat days in Miami to human-caused climate change.
