General term for any device that measures precipitation: principally a rain gauge or snow gauge.

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

In general, any self-recording instrument carried aloft by any means to obtain meteorological data.

The standard deviation of a sufficiently large number of measurements of the same quantity by the same instrument or method. The non-correctable part of the inaccuracy of an instrument, it represents the limit of measurement precision. The uncertainty of ...

Having a specific relationship to a time base or clock. In synchronous communications, data characters are sent according to a timing signal which synchronizes the two communicating devices.

A unit of pressure equal to 10' dyne per cm-' (101 barye), 1000 millibars. 29.53 inches of mercury.

The humidity transducinu element in a Diamond-Hinman radiosonde. Also called electrolytic strip.

The array of indicating marks and figure in relation to which the position of an index is observed, i.e. a scale plate on a recorder.

A precipitation gauge consisting of a receiver in the shape of a funnel which empties into a bucket mounted upon a weighing mechanism. The weight of the catch is recorded as inches of precipitation.

The record made by a hygrograph.

A pressure tube anemometer, consisting of a pitot tube mounted on the windward end of a wind vane and a suitable manometer to measure the developed pressure and calibrated in units of wind.

A general term to designate apparatus designed to observe the details of weather during thunderstorms.

The point (physical and/or electrical) where two distinct data processing elements meet.

(1) The initial component or the sensing element of a measuring system. For example, the receiver of a rain gauge is the funnel which captures the rain and the receiver of a thermoelectric thermometer is the measuring thermocouple. (2) An instrument used ...

The range of operating conditions of a device within which operating influences are negligible. The range is usually narrow. Reference operating conditions are the conditions under which reference performance is stated and the base from which the values o ...

An instrument used to measure the water vapor content of the air. A type of hygrometer. It consists of a wet-bulb and a dry-bulb thermometer. See aspiration psychrometer, Assmann psychrometer. hygrodeik, sling psychrometer.

Abbreviation for precipitation-evaporation ratio.

A measure of the degree to which the weather or climate of a region is favorable to the process of evaporation. Usually considered to be the rate of evaporation. under existing atmospheric conditions, from a surface of water which is chemically pure and h ...

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

An instrument for measuring differences in electric potential.