Wind with a speed between 22 and 27 knots (25 and 31 mph); Beaufort scale number 6.

The wind speed and direction at various levels in the atmosphere above the level reached by surface weather observations.

Operation mode of a communication circuit in which each end can transmit and receive, but not simultaneously.

The range through which the input may be varied without initiating a response. Usually expressed as a percentage of full-scale range.

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.

Liquid water at temperatures colder than freezing.

A contact anemometer connected to an electrical circuit which is so arranged that the average wind speed is indicated.

An addition to a rawinsonde system which allows determination of the slant range to the radiosonde.

A device that allows a terminal or computer at one location to communicate with a terminal or computer at a distant location via wire or phone lines.

A measure of the amount of "spin" (or rotation) in the atmosphere.

A balloon designed to float at a constant pressure level. This may be accomplished by a pressure valve which controls the release of ballast so as to maintain flight above a selected pressure level until the supply of ballast is exhausted. See Moby Dick b ...

The scientific study of the waters of the earth, especially with relation to the effects of precipitation and evaporation upon the occurrence and character of water in streams, lakes, and on or below the land surface. In terms of the hydrologic cycle, the ...

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.

A measure of long-term precipitation effectiveness. The ratio of the normal annual rainfall to the normal annual evaporation.

The process by which one object becomes adhered to another by the binding action of ice.

See instrument error, observational error. random error, standard error, systematic error.

The rate of decrease of temperature with height when unsaturated air is lifted adiabatically (without exchange of heat with its surroundings). The decrease is due to expansion as the air is lifted to a lower pressure.

Instrument which measures and records the amount of evaporation over time.

A common unit used in measurement of atmospheric pressure. Defined as that pressure exerted by a one-inch column of mercury at standard gravity and a temperature of 0'C.

A photometer that measures the received intensity of a distance tight source.