A relatively small-scale, upward moving current of air.

A unit of mass numerically equal to the molecular weight of the substance. The gram-mote or gram-molecule is the mass in grams numerically equal to the molecular weight, i.e. a gram-mole of oxygen is 32 grams.

The center of an area of high pressure, usually accompanied by anticyclonic and outward wind flow. Also known as an anticyclone.

See hydrologic accounting.

An empirical curve relating stream discharge or stage at a point on a stream to discharge or stage at one or more upstream points and, possibly. to other parameters. Also called stage relation.

A unit of luminance (or brightness) equal to 1/6 candles per square centimeter.

A general term for atmospheric water in any of its forms, i.e. clouds, fog, hail, ice crystals, rain.

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

An optical instrument which consists of a sighting telescope mounted so that it is free to rotate around horizontal and vertical axes, with graduated scales so that the angles of rotation may be measured. Used to observe the motion of a pilot balloon.

Instrument for measuring the intensity of radiant energy. Its principle is based on the variation of electrical resistance, with the incoming radiation, of one or both the metallic strips which the instrument comprises.

The total of all deviations of a transducer's output from a specified straight line in a constant environment.

The distance or length of flow of the air past a point during a given interval of time.

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

Precipitation from a cumuliform cloud. Characterized by the suddenness of beginning and ending, by the rapid change in intensity, and usually by a rapid change in the condition of the sky. The solid or liquid water particles are usually bigger than the co ...

An ice coating with a consistency intermediate between glaze and rime.

Abbreviation for precipitation-evaporation ratio.

A current meter consisting of six conical cups, mounted around a vertical axis, which rotate and generate a signal with each rotation. Tail vanes and a heavy weight stabilize the instrument.

A white disk 12" or more in diameter which is lowered into the sea to estimate transparency of the water. The depths are noted at which it first disappears when lowered and reappears when raised.

The probability distribution of random errors, typically a normal distribution with a zero mean.

Transistor-Transistor Logic.