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 ...

Navy Operational Global Atmospheric Prediction System. A global meteorological model operated by the Department of Defense.

Wind with a speed between 34 and 40 knots (39 and 46 mph); Beaufort scale number 8.

The most common of the principal rainbow phenomena, which appears as an arc of about 42

An instrument used for measuring the specific gravity of a liquid.

A temperature telemeter.

A unit of mass numerically equal to the molecular weight of the substance. The gram-mote or gram-molecule is the mass in grams numerically equal to the molecular weight, i.e. a gram-mole of oxygen is 32 grams.

A unit of pressure used principally in oceanography. One decibar (10' dynes/cm2) equals 0.1 bar. In the ocean, hydrostatic pressure in decibars very nearly equals the corresponding depth in meters.

The record made by a hygrograph.

Diffuse solar radiation which has the same intensity in all directions.

Abbreviation for precipitation-evaporation quotient.

Same as dew-point hygrometer.

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

A hygrometer using goldbeater's skin as the sensitive element. Variations of the physical dimensions of the skin caused by its hygroscopic character indicate relative humidity. (Note: Goldbeater's skin is the prepared outside membrane of the large intesti ...

A general term for instruments designed to measure the speed or force of the wind.

The greatest distance at which it is just possible to see and recognize with the unaided eye (1) in the daytime, a prominent dark object against the sky at the horizon, and (2) at night, a known, preferably unfocused, moderately intense light source.

A pointed device which indicates the amount of resistance encountered when it is forced into a material such as snow or soil. See ram penetrometer.

Very small precipitation drops (diameters less than 0.5 mm) that appear to float with air currents while falling in an irregular path. Unlike fog droplets, drizzle falls to the ground.

An instrument, for the recording of two or more meteorological parameters, in which the ventilation is provided by a suction fan.

An instrument used to measure the amount of dew formed on a given surface.