Abbreviation for precipitation-evaporation quotient.

A unit of energy equal to 101 ergs or to 0.2389 calories.

An aneroid barograph designed to record atmospheric pressure variations of very small magnitude.

A colorless and odorless gaseous element. The lightest and apparently the most abundant chemical element in the universe. However, it is found only in trace quantities in the observable portion of our atmosphere, only about 0.00005 percent by volume of dr ...

A protective coating applied to circuits.

Snow shower, particularly of a very light and brief nature.

Snow gauge composed of a metal cylinder, closed at one end, used to obtain a sample of snow from which the water is measured after melting.

See hydrologic accounting.

Apparatus using the combined simultaneous action of a bimetallic thermometer and a hair hygrometer to move a needle in front of a divided scale. fts construction permits dew point variations to be indicated approximately.

A wind vane used to obtain the horizontal and vertical components of the wind.

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

An instrument, located at the surface observing station, which is used to record the data presented by a radiosonde aloft.

The pressure unit of the meter-ton-second system of physical units. equal to 10 millibars or 101 dynes per cm2.

A motorlike device containing a rotor and a stator and capable of converting an angular position into an electrical signal, or an electrical signal into an angular position. When several synchros are correctly connected, all of the rotors will align thems ...

The pressure exerted by the atmosphere as a consequence of gravitational attraction exerted upon the "column" of air lying directly above the point in question.

The change in barometric pressure within a specified period of time (typically 3 hours for meteorological observations).

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

A unit of energy equal to 1.356joules.

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 ...

Same as instrument shelter.