The upper surface of a column of liquid.

Rain gauge which registers precipitation that is too light to be registered by ordinary recording of the depth of water from precipitation. Same as ombrometer.

A temperature scale on which the freezing point of water equals 32

Instrument for measuring the depth to which the soil is frozen.

A colloquial term in western Australia for a squall, associated with thunder, on the northwest coast in summer.

Name applied to a class of instruments which measure the liquid content of the atmosphere.

Particle on which the freezing of water occurs.

An instrument for rapidly obtaining samples of airborne dust; a type of dust counter. Particles pass through a cylindrical chamber, are drawn at high velocity through a narrow slit, and then impinge upon a microscope cover glass located a short distance f ...

The part of a measuring instrument which responds directly to changes in the environment.

The total luminous flux received on a unit area of a given real or imaginary surface, expressed in such units as the foot-candle, lux, or phot.

An instrument which measures the instantaneous rate at which rain is falling on a given surface. Also called a rate-of-rainfall gauge.

The ratios, to the mean wind speed, of the average magnitudes of the component fluctuations of the wind along three mutually perpendicular axes.

A unit of power equal to one joule per second or 10' ergs per second.

A graphical representation of a frequency distribution. The range of the variable is divided into class intervals for which the frequency of occurrence is represented by a rectangular column. The height of the column is proportional to the frequency of ob ...

Same as wave pole.

An anemometer which derives wind speed from measurements of dynamic wind pressures. Wind blowing into a tube develops a pressure greater than the static pressure, while wind blowing across a tube develops a pressure less than the static. This pressure dif ...

Readily taking up and retaining moisture.

Video Display Terminal. An input and display device which includes a keyboard and a screen and allows a human to communicate with a computer.

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.

The volume of water required to cover one acre to a depth of one foot: 43,560 cubic feet.