Heat Index Chart In Degrees Celsius
Below is a chart based on the NWS equation that can be used to estimate temperature and the level of danger associated with varying relative humidity percentages. Potential effects of heat index Effects of the heat index. Celsius Fahrenheit Notes 27-32C 80-90F Caution fatigue is possible with prolonged exposure and activity
The 'Heat Index' is a measure of how hot weather quotfeelsquot to the body. This table uses relative humidity and air temperature to produce the quotapparent temperaturequot or the temperature the body quotfeelsquot. These values are for shady locations only. Exposure to full sunshine can increase heat index values by up to 15F. Also, strong winds,
HEAT INDEX CHART - PLAN AHEAD amp STAY SAFE HEAT INDEX RISK LEVEL Basic heat safety and planning Implement precautions and heighten awareness Degrees Fahrenheit Degrees Celsius 0 64 18 69 21 73 23 78 25 83 28 87 30 91 33 95 35 99 37
Canadian meteorologists devised the Celsius humidex table below, while the U.S. National Weather Service was responsible for developing the Fahrenheit heat index above. The humidex table also produces a single figure in degrees Celsius that reflects how hot, humid air actually feels.
The heat index, or the humidex, is the quotfelt air temperaturequot. It takes into account both the air temperature and its humidity to describe how hot it really feels. Moist air feels hotter because it hinders the evaporation of sweat our natural cooling mechanism.. It is worth noting that the heat index only considers the relative humidity in shaded areas.
These heat index products are issued by WPC twice per day at approximately 02Z and 16Z for the valid days 3 through 7. They are based on an ensemble of model and human forecasts. Deterministic plots indicate the most likely forecast while probabilistic plots depict the chance of exceeding various thresholds.
Heat Index Possible heat disorders for people in high risk groups Extreme Danger 130F or higher 54C or higher Heat stroke or sunstroke likely. Danger 105 - 129F 41 - 54C Sunstroke, muscle cramps, andor heat exhaustion likely. Heatstroke possible with prolonged exposure andor physical activity. Extreme Caution 90 - 105F 32
To use the chart, locate the air temperature along the left column and the relative humidity along the top. The cell where the two intersect is the heat index. For example, an air temperature of 90 F and a relative humidity of 60 intersect at a heat index of 100.
For example, the NWS says if it's 96 outside and the humidity is 65, the heat index temperature is 121 degrees. That falls in the orange zone of the chart, indicating a dangerous temperature.
Learn how to calculate and interpret the heat index, an estimate of how hot the air feels to the human body. Use the online calculator or the printable charts to convert temperature and humidity to heat index in Fahrenheit or Celsius.
