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 ...

The center of an area of high pressure, usually accompanied by anticyclonic and outward wind flow. Also known as an anticyclone.

The intensity (flux per unit solid angle) of visible radiation weighted to take into account the variable response of the human eye as a function of the wavelength of light. Usually expressed in candles.

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

In general, pertaining to or affording an overall view. In meteorology, this term has become somewhat specialized in referring to the use of meteorological data obtained simultaneously over a wide area for the purpose of obtaining a comprehensive and near ...

Apparatus designed to measure and record the size distribution of raindrops as they occur in the atmosphere.

An instrument which measures the intensity of radiation by determining the amount of chemical change( or fluorescence produced by that radiation.

Downward-facing pyranometer used for measuring reflected solar radiation.

A colloquial term in western Australia for a squall, associated with thunder, on the northwest coast in summer.

February 2nd. In American folklore, a day that is popularly supposed to provide the key to the weather for the remainder of the winter. Specifically, if the ground-hog upon emerging from its hole casts a shadow, it will return underground, thereby forebod ...

A thermometer which uses a transducing element whose element proper-ties are a function of its thermal state. Common meteorological examples of such thermometers are the resistance thermometer and the thermoelectric thermometer.

The measuring, transmitting, receiving, and indicating apparatus for obtaining the value of a quantity at a distance.

A cylinder installed in a body of water or an evaporation pan to hold a sensor, such as a float to measure water level or a hook gage. The stillwell is constructed so that there is free movement of water in and out of it, and it therefore provides a repre ...

Name sometimes given to a transmissometer.

A temperature scale based on absolute zero. Same as Kelvin temperature scale.

Interational thermometric scale on which the freezing point of water equals 0

Of or pertaining to rain.

The volume of liquid water evaporated per unit area in unit time. usually measured as the depth of liquid water lost per unit time from the whole area.

Video Display Terminal. An input and display device which includes a keyboard and a screen and allows a human to communicate with a computer.

A general term for instruments designed to measure the amount of cloudiness.