The temperature at which the liquid and solid forms of a substance may exist in equilibrium at a given pressure (usually one standard atmosphere). The true freezing point of water is known as the ice point.

A continuous-recording barometer.

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

A modification of the dew cell used in radiosonde equipment.

An aneroid barometer with a scale graduated in altitude instead of pressure units.

See mote.

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

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

Literally "not wet", containing no liquid.

Wind with a speed between 7 and 10 knots (8 and 12 mph), Beaufort scale number 3.

The amount of precipitation captured by a rain gauge.

The true freezing point of water. The temperature at which a mixture of air-saturated pure water and pure ice may exist in equilibrium at a pressure of one standard atmosphere.

Growth of a cloud or precipitation particle by the collision and union of a frozen particle with a super-cooled water drop.

Same as evaporative power.

Eluding precise prediction, completely irregular.

The ratio of the output of an instrument to the input value, i.e. a rain gauge with a sensitivity of 1 tip per 0.01"

A device attached to a meteorological instrument to provide ventilation; usually a suction fan.

See calorie.

General name for an instrument designed to measure the vertical component of the wind speed. See anemoclinometer.

A systematic summary of the terms (inflow, outflow, and storage) of the storage equation as applied to the computation of soil-moisture changes, ground-water changes, etc. An evaluation of the hydrologic balance of an area. Also called basin accounting, w ...