See standard atmosphere.

In thermodynamics, the integrating factor of the differential equation referred to as the first law of thermodynamics, In statistical mechanics, a measure of translational molecular kinetic energy (with three degrees of freedom). In general, the degree of ...

Same as wind sock.

Any meteorological instrument, such as a radiosonde, in which the recording apparatus is located at some distance from the measuring apparatus.

Automated Weather Observing Station. A self-contained weather station designed to make aviation weather observations without operator involvement.

Growth of a cloud or precipitation particle by the collision and union of a frozen particle with a super-cooled water drop.

The distance or length of flow of the air past a point during a given interval of time.

Operation mode of a communication circuit in which each end can transmit and receive, but not simultaneously.

A rocket designed primarily for routine upper air observations in the lower 250,000 feet of the atmosphere, especially that portion inaccessible to balloons (above 100,000 feet).

A device which surrounds a rain gauge and acts to maintain horizontal flow in the vicinity of the funnel so that the catch will not be influenced by eddies generated near the gauge. See Alter shield, Nipher shield, Wild fence.

An instrument which determines the altitude of an object with respect to a fixed level. There are two general types of altimeters: (a) the pressure altimeter, which gives an approximate measure of altitude from a pressure measurement and an assumed standa ...

A form of data transmission in which the bits of each character are sent one at a time along a single communication path. Compare to parallel data transmission.

A measure of the intensity of gusts given by the ratio of the total range of wind speed between gusts and the intermediate periods of lighter wind to the mean wind speed, averaged over both gusts and lulls.

Name applied to a class of instruments which measure the liquid content of the atmosphere.

Sustained winds greater than or equal to 40 mph or gust greater than or equal to 58 mph.

See captive balloon, ceiling balloon, constant-level balloon, free balloon, hurricane beacon, kytoon, Moby Dick balloon, pilot balloon, radiosonde balloon, rockoon, skyhook balloon, transosonde.

A type of wind vane having a split or V-shaped tail. The apex orients itself to the direction of the wind.

Downward scattered and reflected solar radiation, coming from the whole hemisphere with the exception of the solid angle of the sun's disc on a surface perpendicular to the axis of this cone.

The inaccuracy that the manufacturer permits when the unit is calibrated in the factory.

The ratio of the output of an instrument to the input value, i.e. a rain gauge with a sensitivity of 1 tip per 0.01"