ACCRETION Growth or increase in size by gradual
atmospheric property solely by the motion of the
AEROSOLSSmall droplets of liquid suspended in a
gas, such as water in the air.
AFWAAir Force weather agency.
AGLAbove ground level. Measurements suffixed by
the abbreviation AGL refer to height.
ALIDADE A device frequently used by shipboard
navigation personnel to sight objects and read either
relative azimuth bearing or true azimuth bearing.
measurement for a substance under surrounding
ANALOGProportional and continuous. An analog
recorder draws continuous lines proportional to the
electronic signal input. In an analog signal, the
sound pitch varies proportionately with the
intensity of the signal, and the signal is continuous.
ANEMOMETER A device used to measure wind
speed and/or wind direction. From the Greek word
anemo, meaning wind, and modem word meter,
meaning measurement device.
ANEROIDWithout fluid or without water. An
aneroid barometer uses no fluid (mercury).
ANOMALOUSIrregular or abnormal.
ANTICYCLONICAny rotational motion in a
clockwise manner in the Northern Hemisphere, or a
counterclockwise manner in the Southern
APPARENTThe way something appears or is
perceived, although it may not be true.
ARQAutomatic response to query. A method of
obtaining data by using AFMEDS or CMW.
ASCENSIONRising or increasing in elevation.
ASOSAutomated surface observing system.
AWSPAir weather service pamphlet, now AFP or
Air Force pamphlet.
AZIMUTHThe horizontal angular measurement
from a fixed reference to a point. The Navy uses
angular measurements in clockwise degrees from 0
to 360. When 0 is referenced to true north, the result
is a true azimuth bearing. When referenced to an
arbitrary direction, such as the bow of a ship, the
result is a relative azimuth bearing.
BACKINGA change in wind direction in a
counterclockwise manner in the Northern
Hemisphere, or a clockwise direction in the
BATHYTHERMOGRAPHAny device used to
measure and record temperatures through a column
CALVEThe process of splitting ice from a glacier to
CCTVClosed circuit television.
automated clinometer used to measure cloud or
CICCombat information center aboard ship.
CLIMATICAny element associated with the
climate of an area.
CLIMATOLOGY The study of the statistical
means, frequencies, deviations, and trends of
weather elements for an area over a period of time.
CLINOMETERA device used to obtain an angular
elevation measurement of a light spot on a cloud
base to determine the cloud or ceiling height. The
distance between the meter and the light source
must be known.