20
WEATHER GLOSSARY
DIRECTION – Compass heading in true or magnetic North.
WIND SPD – Wind Speed is the measurement of the wind
passing through the impeller. For greatest accuracy, point the
back of the Kestrel directly into the wind.
CROSWND – Crosswind uses the internal compass and a user
selected heading to calculate the crosswind component of
the full wind.
HEADWND – Headwind uses the internal compass and a
user selected heading or target direction to calculate the
headwind component of the full wind.
TEMP – Ambient Temperature is the temperature measured
at the thermistor. For best results, ensure the thermistor
is not exposed to direct sunlight and is exposed to good
airow.
CHILL – Wind Chill is a calculated value of the perceived
temperature based on temperature and wind speed.
HUMIDITY – Relative Humidity is the amount of moisture
currently held by the air as a percentage of the total possible
moisture that the air could hold.
HEAT INDEX – Heat Index is a calculated value of the
perceived temperature based on temperature and relative
humidity.
DEW POINT – Dew Point is the temperature at
which water vapor will begin to condense out of
the air.
WET BULB – Wet Bulb is the lowest temperature
that can be reached in the existing environment by
cooling through evaporation. Wet Bulb is always
equal to or lower than ambient temperature.
BARO – Barometric Pressure is the local station
(or absolute) pressure adjusted to mean pressure.
An accurate reading depends on a correct altitude
input and unchanging altitude while measuring.
ALTITUDE – Altitude is the vertical distance
associated with given atmospheric pressure.
An accurate reading depends on correct initial
barometric pressure input and stable barometric
pressure while measuring.
STATION – Station Pressure (Absolute Pressure)
is the pressure exerted by the atmosphere at the
location.
DENS ALT – Density Altitude is the altitude at
which the density of the theoretical standard
atmospheric conditions (ISA) would match the
actual local air density.
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