A43. A fog condition that reduces prevailing visibility to between 5/8 mile and 6 miles.
Frost occurs when radiational cooling lowers the temperature of an object below
the freezing level and ice crystals form through sublimation.
A45. Super-cooled liquid.
The slow rate of fall and droplet size (less than 0.02 inch).
A47. Ice pellets.
A49. Lightning cloud-to-air.
When the first thunder is heard, or when overhead lightning is observed, and the
local noise level is high enough as might prevent the observer from hearing
A51. 10 hectopascals.
The pressure correction applied to station pressure based on the difference in
height of the barometer and the runway or station elevation.
1.62 hectopascals or .045 inches of mercury.
It is a pressure value used by aircraft to allow correct determinations of height
above mean sea level.
A55. A barograph trace or the actual recorded pressures during the period.
The lowest temperature to which an object may be cooled by the process of
A57. Condensation and/or precipitation.
The temperature, below freezing, that a parcel of air must be cooled to in order to
A60. Bucket method, bathythermograph method, and seawater injection method.
True North is in reference to the geographic North Pole while Magnetic North is in
reference to the magnetic North Pole.
Using the CP-264/U true wind computer, a maneuvering board, or an aerological