An instrument used to measure changes in the level of the water in an evaporation pan. The gauge is normally placed in a Stillwell and adjusted so that the point of the hook just breaks the water surface. The change in water level is read on the attached ...

Same as atmometer.

A device for measuring the river stage. Also called stream gauge.

The study of waters (including oceans, lakes, and rivers) embracing either: (a) their physical characteristics, from the standpoint of the oceanographer or limnologist; or (b) the elements affecting safe navigation, from the point of view of the mariner. ...

See approximate absolute temperature scale, Celsius temperature scale, centigrade temperature scale, Fahrenheit temperature scale, Kelvin temperature scale, Rankine temperature scale, Reaumur temperature scale,

The amount of moisture which, if available, would be removed from a given land area by evapotranspiration. Expressed in units of water depth.

The height at which the maximum wind speed occurs, determined in a winds-aloft observation.

Same as geostrophic wind level.

An evaluation of upper air temperature, pressure, and humidity from radio signals received from a balloon- borne radiosonde.

One of the radiation laws which states that the wavelength of maximum radiation intensity for a black body is inversely proportional to the absolute temperature of the radiating black body.

An instrument for photographing the corona and prominences of the sun at times other than at solar eclipse.

An instrument resulting from the combination of a thermograph and a hygrograph and furnishing, on the same chart, simultaneous time recording of ambient temperature and humidity.

A mercury barometer of the fixed cistern type in which a moveable scale terminating in an ivory point is used to compensate for the variations in the height of the mercury in the cistern

An effect noted primarily in wet snow conditions when snow clings to the sides of a precipitation gauge and gradually accumulates until the gauge orifice is capped with accumulated snow. This effect can be minimized by using large collectors, and wind scr ...

Not a linear function of the relevant variables.

A unit of distance equal to 5280 feet. It is sometimes referred to as a land mile.

The transducer of any hygrometer, i.e. that part of a hygrometer that quantitatively "senses" atmospheric water vapor.

An instrument which measures the effective terrestrial radiation. See Angstrom pyrgeometer.

Force wind-Wind with a speed above 64 knots (73 mph); Beaufort scale numbers 12 through 17.

Wind with a speed between 48 and 55 knots (55 and 63 mph), Beaufort scale number 10.