An aneroid barometer with a scale graduated in altitude instead of pressure units.

One of the radiation laws which states that the wavelength of maximum radiation intensity for a black body is inversely proportional to the absolute temperature of the radiating black body.

Sir Napier Shaw's name for the approximate absolute temperature scale,

A clock-driven device for recording the time of occurrence of an event or the time interval between the occurrence of events.

Name sometimes used in place of pyranometer as a generic term.

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 the measurement of the net flux of downward and upward total (solar and terrestrial) radiation through a horizontal surface.

The portion of the strearnflow during any month or year derived from precipitation in previous months or years.

Generally, a measure of the departure of the mean daily temperature from a given standard, one degree day for each degree (

A metallic element of atomic weight 200.6 1, unique (for metals) in that it remains liquid under all but very extreme temperatures.

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

A measure of the intrinsic luminous intensity emitted by a source in a given direction. Luminance is a measure only of light. The comparable term for electromagnetic radiation in general is radiance.

A thermometer which uses a transducing element whose element proper-ties are a function of its thermal state. Common meteorological examples of such thermometers are the resistance thermometer and the thermoelectric thermometer.

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

The range of operating conditions within which a device is designed to operate and for which operating influences are stated. See operating conditions, reference operating conditions.

Nested Grid Model generated every 12 hours by NCEP.

See gust and peak gust.

A unit of distance equal to 5280 feet. It is sometimes referred to as a land mile.

The total luminous flux received on a unit area of a given real or imaginary surface, expressed in such units as the foot-candle, lux, or phot.

A type of cooling-power anemometer based upon the principle that the time constant of a thermometer is a function of its ventilation.