An instrument which measures evaporation by measuring the loss of water from a burette reservoir through a ceramic disc.

Temperature based on an absolute scale.

Sustained winds greater than or equal to 40 mph or gust greater than or equal to 58 mph.

A large plastic constant-level balloon for duration flying (in excess of 24 hours) at altitudes above 40,000 feet, used for the determination of wind fields and the measurement of upper atmospheric parameters.

The officially designated elevation of an airport above mean sea level, taken as the highest point on any of the runways of the airport. Same as airport elevation.

The frequency of a carrier wave.

An instrument designed to record the duration of sunshine at a given location without regard to intensity. See Campbell- Stokes recorder, Jordan sunshine recorder, Marvin sunshine recorder, Pers sunshine recorder.

Downward-facing pyranometer used for measuring reflected solar radiation.

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

Same as radiation pattern. Anticyclone-An area of high atmospheric pressure which has a closed circulation that is anticyclonic (clockwise in northern hemisphere and counterclockwise in southern hemisphere).

The envelope of air surrounding the earth and bound to it more or less permanently by virtue of the earth's gravitational attraction. The system whose chemical Properties. dynamic motions, and physical processes constitute the subject matter of meteorolog ...

A radiosonde whose carrier wave is switched on and off in such a manner that the interval of time between the transmission of signals if a function of the magnitude of the meteorological elements being measured.

The actual lifting force of an inflated balloon, usually expressed in grams.

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

A clockwise change in wind direction. Veering winds with height are indicative of warm air advection (WAA).

An instrument developed by K. Angstrom for measuring the effective terrestrial radiation. It consists of four manganin strips, of which two are blackened and two are polished. The blackened strips are allowed to radiate to the atmosphere while the polishe ...

A standard interface between a computer input/output port and a peripheral device. Signal properties including time duration, voltage. and current, are specified by the Electronic Industries Association.

An instrument used to measure the water vapor content of the air.

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

Nested Grid Model generated every 12 hours by NCEP.