Heat Index Equations Formulas Calculator
Weather - Temperature - Heat Stroke Cramps Exhaustion - Medical
Problem:
Solve for heat index.
| c1 | = | -42.379 | c2 | = | -2.04901523 |
| c3 | = | -10.14333127 | c4 | = | -0.22475541 |
| c5 | = | -6.83783 x 10-3 | c6 | = | -5.481717 x 10-2 |
| c7 | = | -1.22874 x 10-3 | c8 | = | 8.5282 x 10-4 |
| c9 | = | -1.99 x 10-6 |
The equation requires the temperature to be greater than 80 degrees Fahrenheit
and the relative humidify to be above 40 percent.
The equation approximates the heat index to within plus or minus 1.3 degrees Fahrenheit.
Enter Calculator Inputs:
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Solution:
Enter input values and press Calculate.
Solution In Other Units:
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Input Unit Conversions:
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Physical Effect To Humans
| 80 to 90 °F | 80 to 90 °C | caution | Possible fatigue. Physical activity could lead to heat cramps. |
| 90 to 105 °F | 80 to 90 °C | extreme caution | Possible heat cramps and exhaustion. Physical activity could lead to heat stroke. |
| 105 to 130 °F | 80 to 90 °C | danger | Likely heat cramps and exhaustion. Probable heat stroke. |
| above 130 °F | 80 to 90 °C | extreme danger | Imminent heat stroke. |
Reference:
Wikimedia Foundation, Inc. Heat Index. 2010. https://en.wikipedia.org/wiki/Heat_index.
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