See hydrologic accounting.

Any sudden and heavy rain, almost always of the shower type.

A forecast of weather elements of particular interest to aviation; including ceiling, visibility, upper winds, icing, turbulence, precipitation types, and storms.

A device for obtaining a continuous record of stage at a point on a stream. The most common recorders consist of a float-actuated pen which traces a record on a clock driven chart.

See calorie.

A counterclockwise change in wind direction. Backing winds with height are indicative of cold air advection (CAA).

The height ascribed to the lowest layer of clouds or obscuring phenomena when it is reported as broken, overcast, or obscuration and not classified as "thin" or "partial." The ceiling is termed unlimited when these conditions are not satisfied. ...

The play or loose motion in an instrument due to the clearance existing between mechanically contacting parts.

A device that combines several separate communications signals into one and outputs them on a single line.

The ratio of the existing amount of water vapor in the air at a given temperature to the maximum amount that could exist at that temperature. Usually expressed in percent.

A thin metal disc partially evacuated of air used to measure atmospheric pressure by measuring its expansion and contraction.

Same as Aeolian.

Same as river gauge.

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

Same as ombrometer.

An instrument that automatically records pressure and temperature.

In general. the severe wind of an intense tropical cyclone (hurricane or typhoon). The term has no further technical connotation, but, unfortunately, is easily conftlsed with the strictly defined hurricane-force wind,

Operation mode of a communication circuit in which one end can only transmit and the other end can only receive.

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.

An ion counter of the aspiration condenser type, used for the measurement of the concentration and mobility of small ions in the atmosphere.