A series of Nansen-bottle water samples and associated temperature observations resulting from one release of a messenger.

The water portion of the earth as distinguished from the solid part, called the lithosphere, and from the gaseous outer envelope, called the atmosphere.

General term for an instrument used to make direct measurements of visual range or measurements of the physical characteristics of the atmosphere which determine the visible range.

The height ascribed to the lowest layer of clouds or obscuring phenomena when it is reported as broken, overcast, or obscuration and not classified as "thin" or "partial." The ceiling is termed unlimited when these conditions are not satisfied. ...

The process by which events in the real world are translated into machine-readable signals.

Water vapor content of the air. See absolute humidity, dew point, mixing ratio, relative humidity, specific humidity.

A clockwise change in wind direction. Veering winds with height are indicative of warm air advection (WAA).

(1) The ratio of the speeds of a chemical reaction at two temperatures differing by 10

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.

The difference between the air temperature and the dew-point. Also called dew-point deficit, dew-point depression.

The temperature at which all three phases of a substance can exist in equilibrium. This temperature occurs at only one pressure. The triple-point of water is 273.16 K and is the basis of the Kelvin scale.

The record obtained from a bolometer.

The element directly responsive to the value of the measured variable.

The smallest change in the environment that causes detectable change in the indication of an instrument. Compare to sensitivity.

A tube designed to measure the rate of flow of fluids. It consists of a tube having a constriction or throat at its midsection. The difference between the pressure measured at the inlet and at the throat is a function of the fluid velocity. Compare to Pit ...

Generally, the relative states of inflow, outflow, and storage of moisture over a given area of earth's surface.

Cathode Ray Tube. A display element, consisting of a vacuum tube and screen, used with computers.

A thermometer consisting of a clock mechanism the speed of which is a function of temperature.

A local variation of the wind vector or any of its components in a given direction.

The flux of visible radiation, so weighted as to account for the manner in which the response of the human eye varies with the Wavelength of radiation. The basic unit for luminous flux is the lumen,