A scale with the ice point at zero degrees and the boiling point of water at 80 degrees, with pressure of one atmosphere.

A halo consisting of a faint white circle passing through the Sun and running parallel to the horizon for as much as 360

A diagram showing the intensity of the radiation field in all directions from a transmitting radio or radar antenna at a given distance from the antenna.

Same as geostrophic wind level.

A thermoelectric thermometer used for measuring air temperature. The name is derived from the fact that the reference thermocouple is placed in an insulated bottle.

A system of estimating and reporting wind speed, originally based on the effect of various wind speeds on the amount of canvas that a full-rigged nineteenth century frigate could carry.

A graphical aid used in the reduction of data from a winds aloft observation.

A chronograph used to make a time-record of certain measured meteorological elements. The most common type, the triple register, records wind direction and speed, duration of sunshine, and amount of rainfall (sensed respectively by a contact anemometer, M ...

in folklore, a name for fire.

Physical equipment used in data processing. Compare to firmware, software.

The component of the radiosonde which includes the modulating blocking oscillator and the radiofrequency carrier oscillator.

Same as parhelion.

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

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 ...

A method of streamflow routing which assumes that storage is a linear function of the weighted flow in the reach and is adaptable to a simple mathematical solution.

Snow shower, particularly of a very light and brief nature.

A flower-like diagram indicating the relative frequencies of different wind directions for a given station and period of time.

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

A type of pressure-plate anemometer in which the plate, restrained by a stiff spring, is held perpendicular to the wind. The wind-activated motion of the plate is measured electrically. The natural frequency of this system can be made high enough so that ...

A measure of luminous flux remaining in a light beam after it has passed through a specified distance of the atmosphere.