Fine dust or salt particles dispersed through a portion of the atmosphere; a type of lithometer. The particles are so small they cannot be felt or seen with the naked eye. Many haze formations are caused by the presence of an abundance of condensation nuc ...

A set of weekly colored rainbow arcs sometimes discernable inside a primary rainbow.

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

The mean difference between the readings of a given instrument and those of a standard instrument.

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 unit of luminous intensity of a light source.

A photometric unit of illuminance or illumination equal to one lumen per square centimeter.

(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 ...

The process by which small particles suspended in a medium of a different refractive index diffuse a portion of the incident radiation in all directions. In scattering no energy transformation results, only a change in the spatial distribution of the radi ...

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

Graduated fixed stake used in regions of abundant snowfall to facilitate the measurement of snow depth.

Any one of numerous devices for the measurement of either speed alone or of both direction and speed (set and drift) in flowing water.

A cup anemometer with its shaft mechanically coupled to a magneto.

An element that can control current without moving parts, heated filaments, or vacuum gaps.

The succession of stages through which water passes on the ground and in the atmosphere: evaporation from land or bodies of water, condensation to form clouds, precipitation, accumulation in the soil or in bodies of water, and re-evaporation.

Same as marine rainbow.

A small balloon used to determine the height of the cloud base. The height can be computed from the ascent velocity of the balloon and the time required for its disappearance into the cloud.

Anemometer which measures wind speed by measuring the degree of cooling of a metal film heated by an electric current. A type of cooling-power anemometer.

The point (physical and/or electrical) where two distinct data processing elements meet.

In general. the severe wind of an intense tropical cyclone (hurricane or typhoon). The term has no further technical connotation, but, unfortunately, is easily conftlsed with the strictly defined hurricane-force wind,