A flower-like diagram indicating the relative frequencies of different wind directions for a given station and period of time.

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 rainbow of angular radius of about 50

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

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

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

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

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 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.

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

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 ...

Small particle on which water vapor condenses.

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.

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

The record made by a hygrograph.

Same as river gauge.

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 ...