Instrument for measuring the mean intensity of glo global solar radiation (direct and diffuse) near the earth's surface in a specified time interval.

A refraction phenomenon similar to a parahelion, but occurring generally at a distance of 120

The energy of any type of electromagnetic radiation. Also called radiation.

An air-launched balloon designed to be released in the eye of a tropical cyclone, float within the eye at predetermined levels, and transmit radio signals for RDF positioning.

The total of all deviations of a transducer's output from a specified straight line in a constant environment.

The correction applied to an instrument to account for the effect of temperature upon its response characteristics.

A graphical representation of stage or discharge at a point on a stream as a function of time.

The flux of visible radiation, so weighted as to account for the manner in which the response of the human eye varies with the Wavelength of radiation. The basic unit for luminous flux is the lumen,

The statement that the viscosity of air is independent of the density of air.

In general, any self-recording instrument carried aloft by any means to obtain meteorological data.

The scientific study of the waters of the earth, especially with relation to the effects of precipitation and evaporation upon the occurrence and character of water in streams, lakes, and on or below the land surface. In terms of the hydrologic cycle, the ...

The state of the weather with respect to its effect upon the kindling and spreading of forest fires.

The unit of speed in the nautical system; one nautical mile per hour. It is equal to 1.1508 statute miles per hour or 0.5144 meters per second.

A severe weather condition characterized by low temperatures and strong winds bearing a great amount of snow, either falling or picked up from the ground.

The visibility along an identified runway, determined from a specified point on the runway with the observer facing in the same direction as a pilot using the runway. Compare to runway visible range.

A recording magnetometer.

The temperature at which the liquid and solid forms of a substance may exist in equilibrium at a given pressure (usually one standard atmosphere). The true freezing point of water is known as the ice point.

The change in the measured transducer output caused by changes in ambient temperature. Usually expressed a percentage of full scale.

film hygrometer element-An electrical hygrometer element constructed of a plastic strip coated with a film of carbon black dispersed in a hygroscopic binder. Variations in atmospheric moisture content vary the volume of the binder and thus change the resi ...

A continuous-recording barometer.