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.

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

Routine broadcast of meteorological information for aircraft in flight.

Same as dropsonde.

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.

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

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

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).

An instrument that shows changes in humidity.

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.

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

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 ...

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

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

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

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

The upper surface of a column of liquid.

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

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