A device, similar to a potometer, for measuring transpiration, consisting of a vessel containing soil in which one or more plants are rooted and sealed so that water can escape only by transpiration from the plant.

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

A special type of radar target, usually a comer reflector, tied beneath a free balloon and designed to be an efficient reflector of radio energy.

A wooden enclosure about sixteen feet square and eight feet high with a precipitation gauge at its center. The function of the fence is to minimize eddies around the gauge and thus insure a catch that is representative of the actual rainfall or snowfall.

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 ...

Routine broadcast of meteorological information for aircraft in flight.

The upper surface of a column of liquid.

An instrument that shows changes in humidity.

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

Same as dropsonde.

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

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

Facing away from the wind.

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.

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

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

Apparatus consisting of (a) standard radiosonde and radiosonde ground equipment to obtain upper-air data on pressure, temperature, and humidity, and (b) a self-tracking radio direction-finder to provide the elevation and azimuth angles of the radiosonde s ...

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

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.

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