Rate of wind movement in distance per unit time.

A rainbow of angular radius of about 50

The total luminous flux received on a unit area of a given real or imaginary surface, expressed in such units as the foot-candle, lux, or phot.

A semiconductor which exhibits rapid and extremely large changes in resistance for relatively small changes in temperature.

A recording magnetometer.

An instrument for the measurement of the net flux of downward and upward total (solar and terrestrial) radiation through a horizontal surface.

A device, similar to a potometer, for measuring transpiration, consisting of a vessel containing soil in which one or more plants are rooted and sealed so that water can escape only by transpiration from the plant.

A systematic observational error due to the characteristics of the observer. The uncertainty in a reading made by an observer may be acertained by a statistical analysis of his or her readings.

Navy Operational Global Atmospheric Prediction System. A global meteorological model operated by the Department of Defense.

General name for an instrument designed to measure the vertical component of the wind speed. See anemoclinometer.

A rain gauge which automatically records the amount of precipitation collected, as a function of time.

A sounding balloon which, when operationally inflated, resembles an inverted teardrop.

The addition of one or more redundant bits to information to verify its accuracy.

Small particle on which water vapor condenses.

A remote indicator for wind speed and direction used in conjunction with a contact anemometer and a wind vane. The indicator consists of a center light, connected to the contact anemometer, surrounded by eight equally spaced lights which are individually ...

A balloon-borne instrument for the simultaneous measurement and transmission of meteorological data. It includes transducers for the measurement of pressure, temperature, and humidity; a modulator for the conversion of the output of the transducers to a q ...

A generic term for any machine that enables a human being to communicate with a computer.

A type of electrical thermometer consisting of two thermocouples which are series-connected with a potentiometer and a constant-temperature bath. One couple, called the reference junction, is placed in a constant-temperature bath, while the other is used ...

The lowest value of a measured quality at which a sensor responds. Compare to tracking.

Any source of radiant energy, especially electromagnetic energy.