QFFA signal used to indicate the value provided; the
QNHA signal used to indicate the value provided;
the minimum altimeter setting for the period of time
RABALA method using radar to track a balloon
carrying a radar-reflector, and is used to determine
RADA unit of measurement of an absorbed dose of
radiation equal to 100 ergs of ionization per gram of
absorbing material or tissue.
RADFOAn acronym for radiological fallout.
RADIOSONDEA device carried aloft by a balloon
to measure pressure, temperature, and humidity
content of the atmosphere.
RAOBAcronym for radiosonde observation or
device carried aloft by balloon that measures
pressure, temperature. humidity of the air, and the
slant-range from the release point. Calculations on
the change in pressure (height) and change in slant-
range (distance) yield wind speed and direction.
electromagnetic energy is bent (refracted) as it
moves through different density layers within the
RHUsual abbreviation for relative humidity.
RIARadiosonde initial analysis, a GFMPL program
used to analyze upper-air soundings.
ROCKETSONDE A device carried aloft by a rocket
which measures pressure, temperature. and
humidity as it drifts on a parachute to the ground.
ROCOBAcronym for rocketsonde observation.
SALINITYA measurement of the amount of salts
dissolved in sea water.
SARSearch and rescue.
SMOOSShipboard meteorological and oceano-
graphic observing system.
SSIShowalter stability index.
SURFCAST(or SURFCST) Acronym for surf
SUROBAcronym for surf observation.
SYNOPTIC In general, pertaining to or affording an
overall view. In meteorology, this term has become
specialized in referring to the use of meteorological
data obtained simultaneously over a wide area for
presenting a comprehensive picture of the state of
TACANTactical air navigation, a radio aircraft
navigation aid used originally by the military to
provide a pilot with direction and distance to a
UHFUltra-high frequency radio transmission.
Universal Time), usually suffixed with a "Z".
UTMUniversal transverse mercator coordinates, a
military coordinate system based on a series of
grids used to locate positions between 84°N and
VEERINGA change in the wind direction in a
clockwise manner in the Northern Hemisphere, or a
counter-clockwise manner in the Southern
VELOCIMETER In general, a device used to
measure velocity (speed). In oceanography, the
sound velocimeter measures the speed of sound in