See evaporative opportunity.

The lowest value of a measured quality at which a sensor responds. Compare to tracking.

Of or pertaining to rain.

The elevation of the water surface in a stream as measured by a river gauge with reference to some arbitrarily selected zero datum.

The indicating part of an instrument. For example, the hand of a watch or the meniscus of a mercury column.

Same as aneroid barometer. Holostelic means wholly made of solids, while aneroid means devoid of liquid.

A seasonal wind of persistent direction, characterized by a pronounced change in direction between seasons.

A clay atmometer consisting of a hollow ceramic sphere through which evaporation occurs. Evaporation is measured by the loss of water from the reservoir which feeds the sphere.

A type of electrical thermometer consisting of two thermocouples which are series-connected with a potentiometer and a constant-temperature bath. One couple, called the reference junction, is placed in a constant-temperature bath, while the other is used ...

A unit of signaling speed representing the number of code elements sent per second; often, bits per second.

A cylinder installed in a body of water or an evaporation pan to hold a sensor, such as a float to measure water level or a hook gage. The stillwell is constructed so that there is free movement of water in and out of it, and it therefore provides a repre ...

A modification of the dew cell used in radiosonde equipment.

National Centers for Environmental Prediction. Central computer and communications facility of the National Weather Service; located in Washington, DC.

The total amount of water transferred to the atmosphere by evapotranspiration.

See standard atmosphere.

The greatest distance at which it is just possible to see and recognize with the unaided eye (1) in the daytime, a prominent dark object against the sky at the horizon, and (2) at night, a known, preferably unfocused, moderately intense light source.

Abbreviation for binary digit. The smallest unit of information, equal to one binary decision, i.e. 1/0, on/off, yes/no.

An evaporation pan in which the evaporation is measured from water in a pan floating in a larger body of water.

Operation mode of a communication circuit in which one end can only transmit and the other end can only receive.

Same as precipitation- effectiveness index.