A coating of ice, generally clear and smooth. formed by the freezing of supercooled water on a surface.

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

The array of indicating marks and figure in relation to which the position of an index is observed, i.e. a scale plate on a recorder.

Emission or transfer of energy in the form of electromagnetic waves or particles.

The distance that an observer can see vertically into a surface-based obscuring phenomenon such as fog, rain, or snow. The distance estimate must be based upon ceiling balloon ascensions or ceiling light projector measurements.

Not a linear function of the relevant variables.

An instrument that shows changes in humidity.

Integrated Flood Observing and Warning System. National Weather Service flood warning program.

The water volume within a specified portion of a stream channel.

Occupational Safety and Health Administration. A regulatory office of the U.S. Department of Labor.

A type of photoelectric photometer used to measure high-altitude winds on the assumption that stellar scintillation is caused by atmospheric inhomogeneities being carried along by wind near the tropopause level.

Random Access Memory. The memory of a computer which can be read and written into at any location without passing through preceding locations.

Same as dropsonde.

In nautical terminology, a contraction for "weather glass" (a mercury barometer).

Routine broadcast of meteorological information for aircraft in flight.

The lowest level at which the wind becomes geostrophic in the theory of the Ekman spiral. Also called gradient wind level.

An instrument used to measure and record earthquake vibrations and other earth tremors.

A power supply which achieves its output regulation by means of one or more active power handling devices which are alternately placed in the "off" or "on" states. It is more efficient than linear supplies which vary the conduction of power devices to ach ...

That part of an audio-modulated radiosonde consisting of the baroswitch, the sensing elements, the reference elements, and the relay.

The process by which small particles suspended in a medium of a different refractive index diffuse a portion of the incident radiation in all directions. In scattering no energy transformation results, only a change in the spatial distribution of the radi ...