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 that shows changes in humidity.

Routine broadcast of meteorological information for aircraft in flight.

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

Same as dropsonde.

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 ...

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

See standard atmosphere.

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 ...

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

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

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.

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

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

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

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.

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

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

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

(1) The ratio of the speeds of a chemical reaction at two temperatures differing by 10