Definitions for "HEAT INDEX"
Related Terms:
Apparent temperature, Dry-bulb temperature, Bowen ratio, Equivalent potential temperature, Dry bulb temperature, Wet bulb temperature, Superheat, Wet-bulb temperature, Dry bulb, Ambient temperature, Thermal, Convection, Superheating, Sensible heat, Temperature rise, Evaporative cooling, Heat rise, Potential temperature, Virtual temperature, Subcooling, Temperature, ambient, Isothermal, Dry adiabatic lapse rate, Refrigerant, Temperature, Convection current, Geothermal heat pump, Wind chill, Cryogenic, Warm, Thermograph, Heat pump, Swamp cooler, Superheated steam, Thermometer, Thermal gradient, Heat transfer, Reheat, Convector, Evaporative cooler, Thermal equilibrium, Chiller, Critical temperature, Pyrometer, Evaporator, Isothermal process, Wet-bulb thermometer, Cooling, Fahrenheit, Radiator
A temperature measured from how hot it really feels when the Relative Humidity (RH) is added to the actual air temperature
a measure of the combined effect of heat and humidity on the human body. U.S. meteorologists compute the index from the temperature T (in °F) and the relative humidity H (as a fraction; that is, H = 0.65 if the relative humidity is 65%). The formula used is HI = -42.379 + 2.04901523 T + 1014.333127 H - 22.475541 TH - .00683783 T2 - 548.1717 H2 + 0.122874 T2H + 8.5282 TH2 - 0.0199 T2H2.
The Heat Index (HI) or the "Apparent Temperature" is an accurate measure of how hot it really feels when the Relative Humidity (RH) is added to the actual air temperature.
The apparent temperature that the body feels due to the combination of abnormally high air temperature and high relative humidity.
An index that combines air temperature and humidity to give an apparent temperature (e.g. how hot it "feels"). Heat Index Chart
The temperature your body feels when the air temperature is combined with the relative humidity. As humidity increases, the rate of evaporation decreases. Our bodies are cooled by the evaporation of our perspiration. Therefore, if evaporation is slowed, the cooling of our bodies is slowed and we feel warmer.
This index is an accurate measure of how hot it feels (in degrees) when moisture (relative humidity) is added to the actual air temperature.
The combination of air temperature and humidity that gives a description of how the temperature feels. This is not the actual air temperature. SEE CHARTS BELOW.
Air temperature and humidity combine to give a reading of how the temperature feels. Hot climates feel hotter when humidity is high.
The apparent temperature that describes the combined effect of high temperatures and high levels of humidity.
The measurement used to determine how much worse the weather really is when it is humid.
An index that combines the air temperature and relative humidity to determine an apparent temperature - how it really feels to the human body
a value that represents the temperature it actually feels at a given air temperature and relative humidity
This index is a measure of the contribution that high humidity makes with abnormally high temperatures in reducing the body's ability to cool itself.
An index that combines air temperature and humidity to give an apparent temperature (eg. how hot it "feels"). Here is a heat index formula originally from Weatherwise magazine. It gives valid results above 70 deg. F. (-42.379+2.04901523*t+10.14333127*r-.22475541*t*r-(6.83783e-3)*t^2-(5.481717e-2)*r^2+(1.22874e-3)*t^2*r+(8.5282e-4)*t*r^2-(1.99e-6)*t^2*r^2) t=temp deg f and r=% rel hum
The heat index combines air temperature and humidity to determine an apparent temperature, i.e., how hot it actually feels. The body cools itself by perspiration, or sweating, in which the water in the sweat evaporates and moves heat away from the body. However, the evaporation rate of the water is reduced when the relative humidity is high. Heat is removed from the body at a lower rate, causing it to retain more heat than it would in dry air
The apparent temperature increase caused by the combination of high temperatures and high relative humidity. High humidity reduces the rate of evaporation of perspiration from the skin and thus reduces the cooling effect. This leads to the sensation of the temperature being higher than it actually is. The heat index is combined with the wind chill for Weatherzone's "Feels Like" temperature shown on the Current Observations page.
A large amount of moisture in the air makes a warm day feel even warmer
An index that combines air temperature and relative humidity to determine an apparent temperature--how hot it feels. See my FAQ page for a truncated chart
The combination of air temperature and humidity that gives a description of how the temperature feels. This is not the actual air temperature. Related term: Heat Index Chart
The Heat index (HI) is an index that combines air temperature and relative humidity to determine an apparent temperature — how hot it actually feels. The human body normally cools itself by perspiration, or sweating, in which the water in the sweat evaporates and carries heat away from the body. However, when the relative humidity is high, the evaporation rate of water is reduced.