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The heat index (HI) is an index that combines air temperature and relative humidity, in shaded areas, to posit a human-perceived equivalent temperature, as how hot it would feel if the humidity were some other value in the shade. For example, when the temperature is 32 °C (90 °F) with 70% relative humidity, the heat index is 41 °C (106 °F ...
Maps show where late-summer heat wave will impact millions in U.S. A heat wave was expected to bring record-high temperatures to the midwestern United States this week before spreading to the East ...
A heat index of 103 or greater is considered dangerous, based on the National Weather Service heat index chart. The peak heat index forecast for the Rochester area will be 103 degrees on Wednesday ...
On May 21, 2022, heat became prevalent in the Mid-Atlantic, resulting in a near record hot Preakness Stakes horse race, with Baltimore and Philadelphia having temperatures of 95 °F (35 °C), Washington DC at 92 °F (33 °C), and New York City at 90 °F (32 °C). [6] This heat persisted into May 22, when Dulles International Airport hit 91 °F ...
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.
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.
A new color-coded heat warning system relies on magenta to alert Americans to the most dangerous conditions they may see this summer. The National Weather Service and the Centers for Disease ...
Heat advisory. 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 ...