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FDFM – Fine Dead Fuel Moisture, also known as 1 Hr
Moisture Content, is an estimate of the moisture content of
dead fuel between 0-1/4” in diameter.
HEAT INDEX – Heat Index is a calculated value of the
perceived temperature based on temperature and relative
humidity.
GLOBE TEMP – Globe Temperature is dened as the
temperature measured inside a 6-inch copper globe
painted black. On the Kestrel HST, the temperature inside
the 1-inch|25 mm globe is converted to the equivalent
temperature for a standard globe. The closest equivalence
will be obtained with airow greater than 2.2 mph|1 m/s.
NWB TEMP – Natural Wet Bulb Temperature is a measure
of evaporative cooling in an environment with unforced,
naturally occurring air ow.
WBGT – Wet Bulb Globe Temperature is a measure of human
heat stress resulting from the combination of eects due
to temperature, humidity, wind speed (wind chill), and
visible and radiant heat. Outdoor WBGT is calculated from
a weighted sum of Natural Wet Bulb Temperature, Globe
Temperature and dry bulb Temperature.
TWL – Thermal Work Limit is a measure of the heat
energy a person can dissipate from their surface area in
Watts per square met
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 with the pressure dierential
associated with the locations altitude above sea level
subtracted. An accurate reading depends on an
accurate initial altitude input and unchanging altitude
while measuring.
ALTITUDE – Altitude is the change in vertical distance
associated with a change in atmospheric pressure.
An accurate reading depends on an accurate initial
barometric pressure input and stable barometric
pressure while measuring.
STATION – Station Pressure (Absolute Pressure) is the
pressure exerted by the earth’s atmosphere at any
given point.
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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