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  1. www.wpc.ncep.noaa.gov › html › heatindexHeat Index Calculation - Weather Prediction Center

    25 Αυγ 2023 · Choose the appropriate calculator and enter the values. Then click "Calculate". * Please note: The Heat Index calculation may produce meaningless results for temperatures and dew points outside of the range depicted on the Heat Index Chart linked below.

  2. www.weather.gov › safety › heat-indexHeat Forecast Tools - National Weather Service

    To find the Heat Index temperature, look at the Heat Index Chart above or check our Heat Index Calculator. As an example, if the air temperature is 96°F and the relative humidity is 65%, the heat index--how hot it feels--is 121°F. The red area without numbers indicates extreme danger.

  3. www.weather.gov › ffc › hichartHeat Index Chart - National Weather Service

    Climate and Past Weather. Local Programs. HEAT INDEX °F (°C) The heat index is an accurate measure of how hot it really feels when the affects of humidity are added to high temperature. RELATIVE HUMIDITY (%) Temp. 40.

  4. www.weather.gov › epz › wxcalc_heatindexHeat Index Calculator - National Weather Service

    Heat Index. by Tim Brice and Todd Hall. Enter a temperature that you would like and choose your units: What the temperature feels like to your body: Fahrenheit Celsius. ° F. Enter your relative humidity: %.

  5. www.weather.gov › ama › heatindexWhat is the heat index? - National Weather Service

    Heat index chart. In order to determine the heat index using the chart above, you need to know the air temperature and the relative humidity. For example, if the air temperature is 100 ° F and the relative humidity is 55%, the heat index will be 124 ° F.

  6. www.noaa.gov › jetstream › synopticHeat Index | National Oceanic and Atmospheric Administration

    20 Σεπ 2023 · The chart shows the Heat Index - how hot it feels - as 109°F (43°C), which is in the orange range for DANGER. Remember, these values are in the SHADE. You can add up to 15°F (8°C) to these values if you are in direct sunlight.

  7. www.wpc.ncep.noaa.gov › html › heatindex_equationThe Heat Index Equation - Weather Prediction Center

    12 Μαΐ 2022 · The Heat Index Equation. The computation of the heat index is a refinement of a result obtained by multiple regression analysis carried out by Lans P. Rothfusz and described in a 1990 National Weather Service (NWS) Technical Attachment (SR 90-23). The regression equation of Rothfusz is.