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

See river basin.

A river gauge in which a weight suspended on a wire is lowered to the water surface from a bridge or other overhead structure to measure the distance from a point of known elevation to the water surface.

A conically shaped, copper rain gauge shield.

Random Access Memory. The memory of a computer which can be read and written into at any location without passing through preceding locations.

Name given to the unit of pressure in the International System of Units (SI). Equal to 1 newton/meter2 or 0.01 millibar.

The range through which the input may be varied without initiating a response. Usually expressed as a percentage of full-scale range.

The array of indicating marks and figure in relation to which the position of an index is observed, i.e. a scale plate on a recorder.

In thermodynamics, the integrating factor of the differential equation referred to as the first law of thermodynamics, In statistical mechanics, a measure of translational molecular kinetic energy (with three degrees of freedom). In general, the degree of ...

A measure of the relative power, or of the relative values of two flux densities, especially of sound intensities and radar power densities. The decibel is derived from the less frequently used unit, the bel, named in honor of Alexander Graham Bell.

Sustained winds greater than or equal to 40 mph or gust greater than or equal to 58 mph.

A polarimeter utilizing a Wollaston prism as a polarizer and a Nicol prism as an analyzer.

An inert gas. A colorless, monatomic element which is found to occur in dry air to the extent of only 0.000524 percent by volume. Helium is very light, having a molecular weight of only 4.003 and specific gravity referred to air of 0.138. Because helium i ...

A pyrheliometer of the bimetallic type used to measure the intensity of direct solar radiation.

An instrument designed to record the duration of sunshine at a given location without regard to intensity. See Campbell- Stokes recorder, Jordan sunshine recorder, Marvin sunshine recorder, Pers sunshine recorder.

An absolute temperature scale with the degree of the Fahrenheit scale and the zero point of the Kelvin scale. The freezing point of water equals 491.69

A radiosonde whose carrier wave is switched on and off in such a manner that the interval of time between the transmission of signals if a function of the magnitude of the meteorological elements being measured.

Winds which, over a small area, differ from those which would be appropriate to the general pressure distribution.

The time required for an instrument to registe 63.2% of a step change in the variable being measured.

See gust and peak gust.