That part of an audio-modulated radiosonde consisting of the baroswitch, the sensing elements, the reference elements, and the relay.

Temperature based on an absolute scale.

Area of a computer or other device where various logic and control elements are interconnected. Often a printed circuit board into which other circuit boards plug at right angles.

The physical exposure of an instrument. The effect of immediate environment upon the representativeness of the measurements obtained by meteorological instruments is considerable and not always correctable. The purpose of the instrument shelter is to prov ...

(1) The ratio of the speeds of a chemical reaction at two temperatures differing by 10

General term for an instrument which records the vertical electric current in the atmosphere.

Of equal or constant pressure, with respect to either space or time.

A current meter consisting of six conical cups, mounted around a vertical axis, which rotate and generate a signal with each rotation. Tail vanes and a heavy weight stabilize the instrument.

Wind with a speed between 34 and 40 knots (39 and 46 mph); Beaufort scale number 8.

Apparatus consisting of (a) standard radiosonde and radiosonde ground equipment to obtain upper-air data on pressure, temperature, and humidity, and (b) a self-tracking radio direction-finder to provide the elevation and azimuth angles of the radiosonde s ...

The amount of precipitation captured by a rain gauge.

The distance or length of flow of the air past a point during a given interval of time.

A forecast of the expected stage or discharge at a specified time, or of the total volume of flow within a specified Interval of time, at one or more points along a stream.

Old snow that has become granular and compacted as a result of melting and refreezing.

See constant-level balloon.

Instrument for measuring the depth of water from precipitation that is assumed to be distributed over a horizontal, impervious surface and not subject to evaporation.

See bimetallic thermometer.

An instrument, dropped from high attitude and carried by a stable parachute. used to measure the vertical component of turbulence aloft.

A faintly-colored circular arc similar to a rainbow but formed on fog layers containing drops whose diameters are 100 microns or less. Also called mistbow, white rainbow.

In nautical terminology, a contraction for "weather glass" (a mercury barometer).