| What is The Heat Index? |
| The heat index is a measure of how hot it really feels when relative humidity is factored in with the actual air temperature. |
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| The computation of heat index |
| HI = -42.379 + 2.04901523*T + 10.14333127*RH - 0.22475541*T*RH - 0.00683783*T*T - 0.05481717*RH*RH + 0.00122874*T*T*RH + 0.00085282*T*RH*RH - 0.00000199*T*T*RH*RH |
| Where | | |
| HI = The heat index expressed as an apparent temperature (°F) |
| T = Temperature (°F) |
| RH = Relative humidity (%) |
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| Meaning of colors |
| | Caution: Fatigue possible with prolonged exposure and/or physical activity. |
| | Extreme Caution: Sunstoke, musde cramps, and/or heat exhaustion possible with prolonged exposure and/or physical activity. |
| | Danger: Sunstoke, musde cramps, and/or heat exhaustion likely. Heatstroke possible with prolonged exposure and/or physical activity. |
| | Extreme Danger: Heatstroke highly likely. |