History of Extreme heat warning in Timeline

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Extreme heat warning

An extreme heat warning is issued by the National Weather Service when the heat index is forecast to reach dangerous levels. Generally, this occurs when the heat index is expected to be at least 105°F (41°C) for over three hours daily for two consecutive days, or if it exceeds 115°F (46°C) at any time. The warning is typically issued within 12 hours of these criteria being met, signaling an imminent threat of heat-related illnesses and advising people to take precautions.

March 10, 2025: National Weather Service updates Excessive Heat Warning to Extreme Heat Warning

On March 10, 2025, the National Weather Service updated the Excessive Heat Warning and Watch, renaming it to the Extreme Heat Warning and Watch.

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May 13, 2025: Extreme heat warning and heat advisory issued in San Antonio, Texas

On May 13, 2025, the National Weather Service office in San Antonio, Texas issued an extreme heat warning and a heat advisory during a heat wave.

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