The Heat index (HI) is sometimes referred to as the "apparent temperature". The HI, given in degrees F, is a measure of how hot it feels when relative humidity (RH) is added to the actual air temperature.
So if the temperature was 85F and the Relative Humidity was 85% the Heat Index value would be 99F. Believe me, that's an uncomfortable value. Many parts of the country have had heat index values over 100F the past couple of weeks. Thanks to the invention of air conditioning many are fortunate to find relief from the heat during these hot summer days. For those who do not have air conditioning it's important to try to keep cool.
The US Army has created a great "Heat Index calculator" (along with other conversions) that you can use to determine the heat index at your particular location: “Weather Conversion Calculators”. It's about halfway down the page. NOAA's Weather Prediction Center has one on their homepage as well: “WPC Heat Index Calculator”
Here is a list of possible heat disorders that could result for people in high risk groups when the HI reaches a certain value:
Heat Index of 130F or higher = Heat stroke or sunstroke likely.
Heat Index between 105 - 129F = Sunstroke, muscle cramps, and/or heat exhaustion likely. Heatstroke possible with prolonged exposure and/or physical activity.
Heat Index between 90 - 105F = Sunstroke, muscle cramps, and/or heat exhaustion possible with prolonged exposure and/or physical activity.
Heat Index between 80 - 90F = Fatigue possible with prolonged exposure and/or physical activity.
For additional information on “HEAT ” and “HEAT STRESS” click on those words.
On a final note, animals such as dogs are very susceptible to heat stroke. Don't forget to find a shady, cool spot for your pets, they will be thankful you did.
Source: CoCoRaHS.org Blog.
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