The Apparent Temperature
The Apparent temperature is
calculated with the Wind speed, Direction, Humidity, and Outdoor Temperature on
a fully clothed human body.
Apparent Solar
Temperature calculates all the above factors but it also adds the Solar
Intensity.
Explanation
- The
apparent temperature is a measure of relative discomfort due to combined heat
and high humidity. It was developed by R.G. Steadman (1979) and is based on
physiological studies of evaporative skin cooling for various combinations of
ambient temperature and humidity. The apparent temperature equals the actual air
temperature when the dew-point temperature is 14C (57.2F).
- At
higher dew-points, the apparent temperature exceeds the actual temperature and
measures the increased physiological heat stress and discomfort associated with
higher than comfortable humidities. When the dew-point is less than 14C (57.2F),
on the other hand, the apparent temperature is less than the actual air
temperature and measures the reduced stress and increased comfort associated
with lower humidities and greater evaporative skin cooling.
- Apparent
temperatures greater than26.6 C ( 80 F) are generally associated
with some discomfort. Values approaching or exceeding 40,5C (105 F)
are considered life-threatening, with severe heat exhaustion or heatstroke
possible if exposure is prolonged or physical activity high. The degree of heat
stress may vary with age, health, and body characteristics.
Take care, Knut/LA9QFA