A wind blowing in a direction perpendicular to the course of a moving object.

An instrument developed by K. Angstrom for measuring the effective terrestrial radiation. It consists of four manganin strips, of which two are blackened and two are polished. The blackened strips are allowed to radiate to the atmosphere while the polishe ...

The state of the atmosphere, mainly with respect to its effects upon life and human activities. As distinguished from climate, weather consists of the short-term (minutes to months) variations of the atmosphere.

The greatest distance at which it is just possible to see and recognize with the unaided eye (1) in the daytime, a prominent dark object against the sky at the horizon, and (2) at night, a known, preferably unfocused, moderately intense light source.

Generally, the relative states of inflow, outflow, and storage of moisture over a given area of earth's surface.

Root Mean Square. This notation is used frequently with error analysis. In that context, it is the square root of the arithmetic mean of the squares of the deviations of the individual calibration points from the theoretical or ideal response.

Radiation with wavelengths less than 4 microns.

An instrument for measuring radiant energy. It consists of an ether differential thermometer with blackened bulbs. One of the bulbs is exposed to the unknown radiation and the other to a black body source whose temperature can be varied. Equality of radia ...

Same as river gauge.

The transmission of data collected at a remote location over communications channels to a central station.

The source of illumination for an antenna reflector. Also called antenna feed.

Temperature assumed by an unsaturated air parcel when brought adiabatically to a standard pressure (1,000 mb).

An instrument which measures evaporation by measuring the loss of water from a burette reservoir through a ceramic disc.

Wind with a speed between 28 and 33 knots (32 and 38 mph); Beaufort scale number 7.

A recording hair hygrometer.

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.

A sudden brief increase in the speed of the wind, followed by a lull or slackening. Compare to peak gust.

A standard interface between a computer input/output port and a peripheral device. Signal properties including time duration, voltage. and current, are specified by the Electronic Industries Association.

The ratios, to the mean wind speed, of the average magnitudes of the component fluctuations of the wind along three mutually perpendicular axes.

The smallest change in the environment that causes detectable change in the indication of an instrument. Compare to sensitivity.