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METEOROLOGY FLIGHT PLANNING
APPENDIX A
DESIGNATED RVR RUNWAY ­ A runway at civilian airports designated by the FAA for
reporting RVR in long-line transmissions.
DEW POINT ­ The temperature to which a given parcel of air must be cooled at constant
pressure and constant water-vapor content in order for saturation to occur.
DISPATCH VISUAL RANGE ­ A visual range value derived from an automated visibility
sensor.
DRIZZLE ­ Fairly uniform precipitation composed exclusively of fine drops (diameter less than
0.02 inch or 0.5 mm) very close together. Drizzle appears to float while following air current,
although unlike fog droplets, it falls to the ground.
DRY ADIABATIC LAPSE RATE ­ The rate of decrease of temperature with height,
approximately equal to 3 °C per 1000 feet. This is close to the rate at which an ascending body
of unsaturated air will cool by adiabatic expansion.
DUSTSTORM ­ An unusual, frequently severe weather condition characterized by strong winds
and dust-filled air over an extensive area.
FEW ­ A layer whose summation amount of sky cover is 1/8 through 2/8.
FIELD ELEVATION ­ The elevation above sea level of the highest point on any of the runways
of the airport.
FOG ­ A visible aggregate of minute water particles (droplets) which are based at the Earth's
surface and reduce horizontal visibility to less than 5/8 statute mile and, unlike drizzle, it does
not fall to the ground.
FREEZING ­ A descriptor, FZ, used to describe drizzle and/or rain that freezes on contact with
the ground or exposed objects, and used also to describe fog that is composed of minute ice
crystals.
FREEZING DRIZZLE ­ Drizzle that freezes upon impact with the ground, or other exposed
objects.
FREEZING FOG ­ A suspension of numerous minute ice crystals in the air, or water droplets at
temperatures below 0°Celsius, based at the Earth's surface, which reduces horizontal visibility.
Also called ice fog.
FREEZING PRECIPITATION ­ Any form of precipitation that freezes upon impact and forms a
glaze on the ground or exposed objects.
GLOSSARY A-3


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