History of Extreme heat warning in Timeline
An extreme heat warning is issued by the National Weather Service in the U.S. when the heat index is forecast to reach dangerous levels. The warning is typically issued within 12 hours of the heat index meeting specific criteria. In most areas, this means a heat index of at least 105°F (41°C) lasting more than three hours a day for two consecutive days or a heat index exceeding 115°F (46°C) for any duration. This warning indicates a high risk of heat-related illnesses and encourages people to take precautions.
2005: Heat Illnesses in High School Sports
Between 2005 and 2020, approximately 51,943 excessive heat illnesses occurred in nine high school sports, according to the National High School Sports Related Injury Surveillance System, High School RIO.
2011: Heat Illnesses in High School Sports
Between 2005 and 2020, approximately 51,943 excessive heat illnesses occurred in nine high school sports, according to the National High School Sports Related Injury Surveillance System, High School RIO.
2018: Public Survey on Extreme Heat Warning
In 2018, a public survey was conducted, results of which led to renaming of the Excessive Heat Warning and Watch to the Extreme Heat Warning and Watch.
2020: Heat Illnesses in High School Sports
Between 2005 and 2020, approximately 51,943 excessive heat illnesses occurred in nine high school sports, according to the National High School Sports Related Injury Surveillance System, High School RIO.
March 10, 2025: Extreme Heat Warning and Watch Renamed
On March 10, 2025, the National Weather Service updated the Excessive Heat Warning and Watch to the Extreme Heat Warning and Watch.
May 13, 2025: Extreme Heat Warning and Heat Advisory in San Antonio
On May 13, 2025, during a heat wave, the National Weather Service office in San Antonio, Texas issued an extreme heat warning and a heat advisory.
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