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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 … See more
The heat index was developed in 1979 by Robert G. Steadman. Like the wind chill index, the heat index contains assumptions about the human body mass and height, clothing, … See more
There are many formulas devised to approximate the original tables by Steadman. Anderson et al. (2013), NWS (2011), Jonson and Long (2004), and Schoen (2005) have … See more
Outdoors in open conditions, as the relative humidity increases, first haze and ultimately a thicker cloud cover develops, reducing the amount of direct sunlight reaching the surface. Thus, there is an inverse relationship between maximum potential … See more
The heat index does not work well with extreme conditions, like supersaturation of air, when the air is more than 100% saturated with water. David Romps, a physicist and climate scientist at the University of California, Berkeley and his graduate student Yi … See more
• Description of wind chill & apparent temperature Formulae in metric units
• Heat Index Calculator Calculates both °F and °C
• Current map of global heat index values See moreWikipedia text under CC-BY-SA license What is the heat index? - National Weather Service
Heat index is the apparent temperature that combines air temperature and relative humidity. Learn how to calculate it, see a chart, and find out the health risks of high heat index values.
What Is the Heat Index, and Why Does It Matter?
Jun 27, 2023 · The heat index is a measure of how hot it really feels outside, when humidity and other factors are considered along with the temperature, according to Kimberly McMahon, a...
What Is the Heat Index, and Why Does It Matter?
Jul 10, 2024 · Heat Index is the felt air temperature that considers both temperature and humidity. Learn how to use the heat index chart, calculator, and alerts to stay safe in extreme heat.
What is the Heat Index and Why is it Used?
Jul 16, 2019 · Heat index is the "feels-like" temperature that combines air temperature and humidity. Learn how to use the chart, calculator and warnings to stay safe in hot and humid weather.
What is the heat index? - National Weather Service
The heat index, also known as the apparent temperature, is what the temperature feels like to the human body when relative humidity is combined with the air temperature. This has …
Heat Index - National Oceanic and Atmospheric …
Sep 20, 2023 · Heat Index is a measure of how hot the body feels based on temperature and humidity. Learn how heat waves form, how sweat evaporates, and how to use the Heat Index chart to assess the risk of heat disorders.
Heat Forecast Tools - National Weather Service
Heat Index is a measure of how hot it feels when relative humidity is factored in with the actual air temperature. Learn how to use the Heat Index chart, calculator, and other NWS tools to assess heat stress and protect yourself …
What Is the Heat Index, and How Does It Differ from …
Jan 25, 2024 · Heat index is the apparent temperature that combines air temperature and humidity, while RealFeel temperature takes into account other factors like wind and sun. Learn how to...
What is the Heat Index and Why Is It Used? - The …
Jul 8, 2016 · Heat index is the "feels-like" temperature that considers humidity and air temperature. It helps assess the risk of heat exhaustion and heat stroke on hot days. Learn how to...
