An instrument used to measure changes in the level of the water in an evaporation pan. The gauge is normally placed in a Stillwell and adjusted so that the point of the hook just breaks the water surface. The change in water level is read on the attached ...

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

Same as pitot tube.

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

A definite portion of a stream channel, commonly taken between two gauging stations, but may be taken between any two specified points.

An instrument which measures the transmissivity of the atmosphere between two points for the determination of visual range.

A unit of pressure used principally in oceanography. One decibar (10' dynes/cm2) equals 0.1 bar. In the ocean, hydrostatic pressure in decibars very nearly equals the corresponding depth in meters.

Readily taking up and retaining moisture.

The temperature registered by a thermometer with its bulb at the level of the tops of the grass blades in short turf.

A temperature scale with the ice point at 273 degrees and boiling point of water at 373 degrees. It is intended to approximate the Kelvin temperature scale with sufficient accuracy for many sciences, notably meteorology.

See hydrologic accounting.

Thermometer used for measuring the highest temperature attained during a given interval of time, for example, a day.

A mercury barometer arranged so that the position of the upper or lower meniscus may be measured photographically. In one design the image of the meniscus is formed on a rotating drum covered with sensitized paper so that a continuous record of pressure a ...

Balance of the water resources of a region, comparing precipitation and inflow with outflow, evaporation, and accumulation.

The effect upon the measurement of rainfall caused by the presence of the rain gauge.

A type of climatic diagram whose coordinates are some form of temperature vs. a form of humidity or precipitation.

An instrument for the measurement of the radon content of the atmosphere.

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.

February 2nd. In American folklore, a day that is popularly supposed to provide the key to the weather for the remainder of the winter. Specifically, if the ground-hog upon emerging from its hole casts a shadow, it will return underground, thereby forebod ...

A device which converts energy from one form into another, i.e. an ac generator transducer which converts the mechanical motion of anemometer cups into an electrical signal.