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Outdoor activity weather calculator11/6/2023 The background of the table is covered in different colors from yellow to red - they represent the risk of heat disorder. At their intersection, there will be a "feel of temperature" or the Heat Index value. ![]() The Heat Index chart displays air temperature and relative humidity along the axes. There are visual tables (charts) that can be used to calculate the Heat Index value. Photo: Heat Index formula / NOAA How to read the Heat Index chart? For example, the US National Weather Service of the NOAA uses this formula: The formulas for calculating this indicator are quite complicated. There is no single way to calculate the Heat Index, it can be counted differently in different countries and meteorological services. How Heat Index is calculated? Is there any formula? Heat Index is a kind of the opposite of Wind Chill chart, which is used when the temperature is affected by the air humidity and wind speed. ![]() The Heat Index is always higher than the actual air temperature. It applies when the feels like temperature is higher than the actual air temperature, that is, in the warm season. ![]() And the more difficult it is to do outdoor activities. The higher the humidity, the higher the perceived temperature appears than the actual temperature. The Heat Index is an index that shows how humidity affects the feels like temperature in hot weather. In this article, we’ll analyze why the temperature on the thermometer often differs from your feelings and how to read the Heat Index chart in order to stay comfortable outdoors in any weather and avoid heatstroke - for example, during a long bike ride, mountain hike or a boat fishing trip in the sea. For sports and outdoor activities, we usually consider the Heat Index in order to dress correctly for the different weather.
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