Closed, curved, flexible tube of elliptic cross section which is deformed, according to type, by variations of atmosphere spheric pressure or temperature and so provides a measurement of the particular parameter.

The part of a measuring instrument which responds directly to changes in the environment.

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

That temperature at which, in a specified latitude, the reading of a particular barometer requires no temperature or latitude correction.

The boundary between the troposphere and stratosphere, usually characterized by an abrupt change in lapse rate. Its height varies from 10 to 20 km. Regions above the tropopause have greater atmospheric stability than regions below.

A unit of energy equal to 1.356joules.

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

An instrument used to measure changes in the level of the water in an evaporation pan. The gauge is normally placed in a Stillwell and adjusted so that the point of the hook just breaks the water surface. The change in water level is read on the attached ...

An instrument for determining the direction of cloud motion. There are two basic designs of nephoscope, the directvision nephoscope and the mirror nephoscope.

The maximum positive and negative deviation observed in testing a device under specified conditions and by a specified procedure. It is usually measured as an inaccuracy and expressed as accuracy, typically in terms of the measured variable, percent of sp ...

An instrument for measuring the difference between incoming and outgoing terrestrial radiation.

The level at which ice crystals and snowflakes melt as they descend through the atmosphere.

Balance of the water resources of a region, comparing precipitation and inflow with outflow, evaporation, and accumulation.

Same as ceiling light.

Same as wave pole.

Navy Operational Global Atmospheric Prediction System. A global meteorological model operated by the Department of Defense.

The ratio of the output of an instrument to the input value, i.e. a rain gauge with a sensitivity of 1 tip per 0.01"

variable audio-modulated radiosonde developed at the Bureau of Standards and used by the United States weather services.

The most common of the principal rainbow phenomena, which appears as an arc of about 42

A mercury-in-glass thermometer which records the temperature upon being inverted and retains its reading until being returned to the first position.