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National Weather Service
HEAT INDEX CHART
Air
Temp
0
5
(F)
135 120 126Relative Humidity (percentage)
101520253035404550556065707580859095 100130 117 122 131
125 111 116 123 131 141
120 107 111 116
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How to fill out heat index chart

How to fill out a heat index chart:
01
Start by finding the current temperature and relative humidity. This information can typically be obtained from weather reports or by using a digital thermometer and a hygrometer.
02
Once you have the temperature and relative humidity, locate the corresponding values on the heat index chart. The temperature is usually listed on the horizontal axis, while the relative humidity is listed on the vertical axis.
03
Find the intersection point of the temperature and relative humidity values on the chart. This point will represent the heat index value.
04
Record the heat index value in the designated area on the chart. It is often displayed in either Fahrenheit or Celsius, depending on the chart's format.
05
Continue filling out the heat index chart by repeating this process for different temperature and relative humidity combinations. This will help you create a comprehensive and accurate chart that reflects different weather conditions.
06
Remember to update the chart regularly to account for changing temperature and humidity levels.
Who needs a heat index chart:
01
Outdoor workers: Individuals working in professions that require them to spend extended periods outdoors, such as construction workers, gardeners, or athletes, can benefit from having a heat index chart. The chart helps them gauge how hot it feels and take necessary precautions to prevent heat-related illnesses.
02
Emergency management agencies: Organizations responsible for public safety, like emergency management agencies, use heat index charts to monitor and evaluate heat stress risks. This allows them to issue appropriate warnings and enact mitigation strategies to protect vulnerable populations.
03
Health professionals: Medical professionals, including doctors, nurses, and public health officials, utilize heat index charts to educate patients and the general public about the potential health risks associated with high heat and humidity. This information helps individuals make informed decisions to prevent heat-related illnesses.
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What is heat index chart?
The heat index chart is a tool used to measure how hot it feels when relative humidity is factored in with the actual air temperature.
Who is required to file heat index chart?
Employers in certain industries, such as construction, agriculture, and landscaping, are required to file heat index charts to protect workers from heat-related illnesses.
How to fill out heat index chart?
To fill out a heat index chart, you need to record the temperature and humidity levels at various times throughout the day, then calculate the heat index using a provided formula or online calculator.
What is the purpose of heat index chart?
The purpose of a heat index chart is to help employers and workers identify when it is too hot to work safely outdoors and take appropriate precautions to prevent heat-related illnesses.
What information must be reported on heat index chart?
The heat index chart should include the date, time, temperature, humidity level, and calculated heat index for each measurement taken.
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