The upper surface of a column of liquid.

An instrument for the measurement of the rate of ice accretion on an unheated body.

The standard deviation (positive square-root of the variation) of the errors associated with physical measurements of an unknown quantity, or statistical estimates of an unknown parameter or of a random variable.

Sir Napier Shaw's name for the approximate absolute temperature scale,

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 ...

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

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.

Routine broadcast of meteorological information for aircraft in flight.

Facing away from the wind.

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

An instrument used for the determination of the electrical conductivity of the atmosphere.

The attenuation of light.

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.

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

The officially designated elevation of an airport above mean sea level, taken as the highest point on any of the runways of the airport. Same as airport elevation.

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

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

Precipitation falling from a cloud, usually in wisps or streaks, but evaporating before it reaches the ground.

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