Kestrel 4500 User Manual download pdf (Page 14)

Kestrel

4500 Pocket Weather

Tracker 27

GLOSSARY

The below denitions have been greatly simplied in order to keep this section brief. We strongly

recommend that anyone who wishes to make use of these measurements refer to one of the many

excellent weather references available for a more in-depth denition. On the internet, visit www.

usatoday.com or www.noaa.gov. Or, locate the USA Today publication, The Weather Book. Please note

that any words in a denition printed in italics are themselves dened in this glossary.

Altimeter Setting

An aviation term for the local barometric pressure. Same as reference pressure.

Altitude

The distance above sea level. The Kestrel Meter calculates altitude based on the measured station

pressure and the input barometric pressure - or “reference pressure”.

Barometric Pressure

The air pressure of your location reduced to sea level. Pressure will change as weather systems move into

your location. Falling pressure indicates the arrival of a low pressure system and expected precipitation

or storm conditions. Steady or rising pressure indicates clear weather. A correct altitude must be input

for the Kestrel Meter to display barometric pressure correctly.

Declination

Also called variation, is the angle between magnetic north and true north. Declination is considered

positive east of true north and negative when west. Declination changes over time and with location.

Density Altitude

The altitude at which you would be, given the current air density. Often used by pilots in order to

determine how an aircraft will perform. Also of interest to individuals who tune high performance

internal combustion engines, such as racecar engines.

Dewpoint

The temperature to which air must be cooled in order for condensation to occur. The dierence between

dewpoint and temperature is referred to as the “temperature/dew point spread”. A low dewpoint spread

indicates high relative humidity, while a large dewpoint spread indicates dry conditions.

Heat Index

A practical measure of how hot the current combination of relative humidity and temperature feels to a

human body. Higher relative humidity makes it seem hotter because the body’s ability to cool itself by

evaporating perspiration is reduced.

Magnetic North

The point on the Earth’s surface where the Earth’s magnetic eld points directly downwards. This pole is

constantly wandering.

Reference Pressure

The local barometric pressure. Input to the altitude screen to provide correct altitude readings. Also

known as the altimeter setting.

Relative Humidity

The amount of water vapor actually in the air divided by the maximum amount of water vapor the air

could hold at that temperature, expressed as a percentage.

Station Pressure

The air pressure of your location, NOT reduced to the sea level equivalent.

Temperature

The ambient air temperature.

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Kestrel 4500 User Manual Page 14

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