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  1. 1 day ago · Heat index forecast for Saturday. Heat index measures how hot it feels outside, accounting for temperature and humidity. Map shows highest level forecast for the day. Caution Feels like 80°-90 ...

  2. Jul 15, 2023 · By NBC News. An “extremely dangerous heat wave” will plague the Western and Southern parts of the country over the weekend, forecasters warned early Saturday. “Numerous record high temperatures...

  3. Jun 30, 2023 · Heat waves begin when high pressure in the atmosphere moves in and pushes warm air toward the ground. That air warms up further as it is compressed, and we begin to feel a lot hotter. The...

  4. Jun 23, 2021 · Over a six-day period during the middle of June 2021, a dome of hot air languished over the western United States, causing temperatures to skyrocket. From June 15-20, all-time maximum temperature records fell at locations in seven different states (CA, AZ, NM, UT, CO, WY, MT).

  5. Jun 27, 2023 · CNN — More than 55 million people from southern Arizona to the Florida coast are sweltering under a worsening heat wave that is expected to expand its reach this week, bringing more dangerous...

  6. Jul 20, 2022 · The World Meteorological Organization, an agency of the United Nations, defines a heat wave broadly as a period of unusually hot weather over a region persisting for at least two consecutive days...

  7. Jun 22, 2023 · The Weather Service issues heat watches, warnings and advisories when extreme heat — generally a heat index of 100 degrees or higher — is expected or imminent. Any watch, warning or advisory in...

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