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Information on Heat Index

188

Principal Authors: ANONIPEDITS:0

Information on Apparent

Temperature

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.

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 14

C (57.2

F). 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 14

C (57.2

F), 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 than 26.6

C (80

F) are generally associated with some

discomfort. Values approaching or exceeding 40.5

C (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.

Source: http:/ / wiki. weather- watch. com/ index. php? title=Information_ on_ Apparent_

Temperature&oldid=1852

Principal Authors: ANONIPEDITS:0

Glossary

• €APRS•••Automatic Position Reporting System. An amateur radio system originally

developed to maintain an ongoing record of the location of a mobile radio-transmitter. It

has been expanded to allow reporting of weather information within a position report.

Originally restricted to reporting via amateur radio, it is now possible to send (and

receive) these reports via the Internet. The Internet APRS system feeds data into the USA

Hurricane warning center and other NOAA systems.

• €ASOS•••Automatic Surface Observing Station. Used for automatic METAR report

generation. Has a ceilometer to measure cloud height and type automatically.

• €CWOP•••Citizen Weather Observer Program

[1]

. A private-public partnership with three

main goals: 1) to collect weather data contributed by citizens; 2) to make these data

available for weather services and homeland security; and 3) to provide feedback to the

data contributors so that they have the tools to check and improve their data quality. In

fact, the web address, wxqa.com, stands for weather quality assurance.

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