General name for an instrument which measures the earth's magnetic field intensity.

A graphical aid used in fire weather forecasting to calculate the degree of forest-fire danger (or burning index). Commonly in the form of a circular slide rule, the firedanger meter relates numerical indices of (a) the seasonal stage of foliage, (b) the ...

in United States weather observing practice, the highest "instantaneous" wind speed recorded at a station during a specified period, usually the 24-hour observation day. Therefore, a peak gust need not be a true gust of wind.

A reflecting type telescope with a 45

Thermometer used for measuring the highest temperature attained during a given interval of time, for example, a day.

National Weather Service. Administered by the U.S. Department of Commerce.

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 thermograph in which ventilation is provided by a suction fan.

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

See feed.

A thermometer consisting of a clock mechanism the speed of which is a function of temperature.

Difference between the instantaneous wind velocity at a point and the mean wind velocity taken over a given time interval. Also called fluctuation velocity.

A hypothetical "body" whose surface absorbs no electromagnetic radiation of any wavelength. An idealization exactly opposite to that of the black body. In nature, no true white bodies are known. Moist white pigments exhibiting high reflectivity for visibl ...

A mercury barometer designed for use aboard ship. The instrument is of the fixed-cistern type (see Kew barometer). The mercury tube is constructed with a wide bore for its upper portion and with a capillary bore for its lower portion. This is done to incr ...

See radiosonde commutator.

The record of an aneroid barograph.

Part of a computer word that has meaning in itself, often, a byte.

A very sensitive electrostatic electrometer for measuring small potential differences.

A hygrometer which uses a transducing element whose electrical properties are a function of atmospheric water vapor content. The humidity strip and carbon-film hygrometer element are examples of such a transducer.

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 ...