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 general term for atmospheric water in any of its forms, i.e. clouds, fog, hail, ice crystals, rain.

Same as precipitation-evaporation ratio.

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 ...

A unit of illuminance or illumination equal to one lumen per foot'. This is the illuminance provided by a light source of one candle at a distance of one foot.

The unit of speed in the nautical system; one nautical mile per hour. It is equal to 1.1508 statute miles per hour or 0.5144 meters per second.

Difference between the instantaneous wind velocity at a point and the mean wind velocity taken over a given time interval. Also called fluctuation velocity.

An approximation to the complete equations describing atmospheric motion in which only the terms most important for the growth and decay of synoptic scale extratropical weather systems (i.e., the large areas of high and low pressure seen on weather maps) ...

Interational thermometric scale on which the freezing point of water equals 0

The record made by a hygrograph.

An instrument for measuring the difference between incoming and outgoing terrestrial radiation.

A psychrometer in which the ventilation is provided by a suction fan.

In aviation terminology, route or terminal weather conditions of sufficiently low visibility to require the operation of aircraft under instrument flight rules.

Water vapor content of the air. See absolute humidity, dew point, mixing ratio, relative humidity, specific humidity.

A power supply which achieves its output regulation by means of one or more active power handling devices which are alternately placed in the "off" or "on" states. It is more efficient than linear supplies which vary the conduction of power devices to ach ...

Solar and terrestrial radiation directed upward (away From the earth's surface); outgoing radiation.

That part of snow melt that reaches stream channels as runoff.

Any twelve-month period, usually selected to begin and end during a relative dry season. Used a basis for processing streamflow and other hydrologic data. The period from October 1 to September 30 is widely used in the U.S.

A photometric unit of illuminance or illumination equal to one lumen per square centimeter.

A term used to describe a sensor (or sensors), the associated transducer(s), and the data readout or recording device.