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An excessive heat watch is a notice issued by the National Weather Service of the United States when the high temperatures reach anywhere within the range of 95 °F (35 °C) and 100 °F (38 °C) in the continental US.
An excessive heat warning is a notice issued by the National Weather Service of the United States within 12 hours of the heat index reaching one of two criteria levels. In most areas, a warning will be issued if there is a heat index of at least 105 °F (41 °C) for more than three hours per day for two consecutive days, or if the heat index is greater than 115 °F (46 °C) for any period of time.
Hazardous seas warning; Hazardous seas watch; Hazardous weather outlook; Heat advisory; Heavy freezing spray warning; Heavy freezing spray watch; Heavy snow warning; History of Atlantic hurricane warnings; Hong Kong rainstorm warning signals; Hong Kong tropical cyclone warning signals; HURCON; Hurricane force wind warning; Hurricane local statement
The National Weather Service and Centers for Disease Control and Prevention worked together to create a new heat risk impact map. This map shows the heat risk nationwide for Friday, April 26, 2024.
Extreme danger: When the heat index is 125 degrees or higher, heat stroke is likely. Heat Index calculator Here's a chart to help you find out what the heat index is.
More than 60 million people were under heat alerts Tuesday as a scorching heat wave blanketed the Midwest. Maps show where late-summer heat wave will impact millions in U.S. Skip to main content
A heat advisory is a notice issued by the National Weather Service of the United States. Local offices often have their own criteria. High values of the heat index are caused by temperatures being significantly above normal and high humidities, and such high levels can pose a threat to human life through conditions such as heat stroke. [1]
Why kids are more vulnerable to extreme heat. Kids struggle to regulate their body temperature, which is why health experts recommend making an effort to keep them safe while outside on a hot day.