Same as ceiling light.

Infrared radiation emitted by or being propagated through the atmosphere.

modulated radiosonde-A radiosonde which transmits the indications of the meteorological sensing elements in the form of pulses spaced in time. The meteorological data are evaluated from the intervals between the pulses. Also called timeinterval radiosonde ...

The total of direct solar radiation and diffuse sky radiation received by a unit horizontal surface. Global radiation is measured by pyranometers.

The greatest distance at which it is just possible to see and recognize with the unaided eye (1) in the daytime, a prominent dark object against the sky at the horizon, and (2) at night, a known, preferably unfocused, moderately intense light source.

An instrument which records the duration of sunshine and gives a quantitative measure of the amount of sunshine by the action of the sun's rays upon blueprint paper. A type of sunshine recorder.

A record obtained from a meteorograph. A chart in which meteorological variables are plotted against time.

Same as Aeolian.

The upward force produced by the gas in a balloon. It is equal to the free lift plus the weight of the balloon and the attached equipment.

See river basin.

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 ...

The value of the quantity measured, as indicated or otherwise provided by a measuring instrument.

Same as humidity strip.

The effect upon the measurement of rainfall caused by the presence of the rain gauge.

A thermometer with a muslin-covered bulb which is moistened. used to measure wet-bulb temperature.

Small particle on which water vapor condenses.

A sounding balloon which, when operationally inflated, resembles an inverted teardrop.

The pressure exerted by the atmosphere as a consequence of gravitational attraction exerted upon the "column" of air lying directly above the point in question.

Any one of a family of circular arcs consisting of concentric colored bands, arranged from red on the inside to blue on the outside, which may be seen on a "sheet" of water drops (rain, fog, spray). The most common of the many possible is the primary rain ...

Instrument for measuring the depth to which the soil is frozen.