Heat index equation

What is heat index formula?

The heat index formula is expressed as, HI= c1+c2T+c3R+c4TR+c5T2+c6R2+c7T2R+c8TR2+c9T2R2. In this formula, HI = heat index in degrees Fahrenheit. R = Relative humidity.

What is the temperature humidity index?

The temperature-humidity index may be computed from measures of atmospheric moisture other than wet-bulb temperature. For example, the formula THI = 0.55T + 0.2T d + 17.5 involves air temperature T (°F) and dewpoint T d (°F).

What’s the highest heat index?

Heat Index Charts and Wheels The highest dew point ever recorded, 95°F (35°C), was recorded at Dhahran, Saudi Arabia, on July 8, 2003. With an air temperature of 108°F (42°C) the heat index was 178°F (81°C).

At what heat index is dangerous?

What is the heat index?

ClassificationHeat IndexEffect on the body
Danger103°F – 124°FHeat cramps or heat exhaustion likely, and heat stroke possible with prolonged exposure and/or physical activity
Extreme Danger125°F or higherHeat stroke highly likely

Is humidity of 70 high?

Experts generally agree that the ideal indoor humidity levels for comfort and for avoiding health effects are between 35 and 60 percent. When you’re spending time in a home or workplace with humidity levels in excess of 60 percent, it’s increasingly likely that you will experience certain health issues.

What is a good humidity level?


How is RealFeel calculated?

The AccuWeather RealFeel Temperature takes into account the effects of multiple parameters, including air temperature, wind speed, solar intensity, humidity, precipitation intensity/type, elevation and atmospheric pressure.

What is heat stress index?

The heat stress index is defined as the relation of the amount of evaporation (or perspiration) required as related to the maximum ability of the average person to perspire (or evaporate fluids from the body in order to cool themselves).

What is hottest temperature on Earth?

The current official highest registered air temperature on Earth is 56.7 °C (134.1 °F) recorded in Furnace Creek Ranch, California, located in the Death Valley desert in the United States, on 10 July 1913.

What is the hottest temperature a human can survive?

Hot. 44 °C (111.2 °F) or more – Almost certainly death will occur; however, people have been known to survive up to 46.5 °C (115.7 °F). 43 °C (109.4 °F) – Normally death, or there may be serious brain damage, continuous convulsions and shock.

Where is the hottest place on earth?

Death Valley, California, USA The aptly named Furnace Creek currently holds the record for hottest air temperature ever recorded. The desert valley reached highs of 56.7 degrees in the summer of 1913, which would apparently push the limits of human survival.

What is a normal heat index?

Technically, Heat Index is calculable only when air temperature is above 68° F (20° C) because it is a measure of heat stress, which is not significant at lower temperatures. Below 57° F (13.9° C), the Heat Index is equal to outside temperature. Heat Index (HI): Relative to normal (20-40%) humidity.

How hot is too hot for working conditions?

According to the Canadian Centre for Occupational Health and Safety, 35 – 40°C is considered to be the ‘limit of high temperature tolerance’ for most people. Remember too that heat is not just an issue for people working outside.

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