Wind with a speed between 7 and 10 knots (8 and 12 mph), Beaufort scale number 3.

Same as mirror nephoscope.

Air in motion relative to the surface of the earth. Almost exclusively used to denote the horizontal component.

A system of physical units based on the use of the centimeter, gram. and the second as elementary quantities of length. mass. and time.

Situated on the side from which the wind blows.

A set of electrical conductors, often on a backplane, that carry data and power signals among the various components of a computer.

A white disk 12" or more in diameter which is lowered into the sea to estimate transparency of the water. The depths are noted at which it first disappears when lowered and reappears when raised.

A thermometer which utilizes the thermal properties of gas. There are two forms of this instrument: (a) a type in which the gas is kept at constant volume, and pressure is the thermometric property, and (b) a type in which the gas is kept at constant pres ...

The record of an aneroid barograph.

See evaporative opportunity.

A device for measuring the frequency of occurrence of atmospherics whose intensity is greater than a predetermined level.

Any sudden and heavy rain, almost always of the shower type.

Ragged low clouds, usually stratus fractus. Most often applied when such clouds are moving rapidly beneath a layer of nimbostratus.

In physics, any process in which the flux density (or power, amplitude, intensity, illuminance, etc.) of a "parallel beam" of energy decreases with increasing distance from the source. Attenuation is always due to the action of the transmitting medium its ...

(1) The initial component or the sensing element of a measuring system. For example, the receiver of a rain gauge is the funnel which captures the rain and the receiver of a thermoelectric thermometer is the measuring thermocouple. (2) An instrument used ...

A common type of terrestrial scintillation; shimmering over a hot surface (such as a roadway) on a quiet, cloudless. summer day.

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 ...

An absolute pyhrliometer, developed by C.G. Abbott, in which the radiation-sensing element is a blackened water-calorimeter.

An instrument which determines the black-body temperature of a substance by measuring its thermal radiation.

A measure of the attenuation due to scattering, of light as it traverses a medium containing scattering particles.