A rainbow formed by light rays which have been reflected from an extended water surface. Not to be confused with a reflected rainbow whose image may be seen in a still body of water. The center of a reflection rainbow is at the same elevation as the sun b ...

The number of cycles per second between the limits of a frequency band.

National Centers for Environmental Prediction. Central computer and communications facility of the National Weather Service; located in Washington, DC.

The rate of decrease of pressure per unit distance at a fixed time.

An instrument for determining the degree of polarization of light. See photopolarimeter.

An instrument which indicates the presence of precipitation. The ombroscope consists of a heated, water-sensitive surface which indicates by mechanical or electrical techniques the occurrence of precipitation.

A set of electrical conductors, often on a backplane, that carry data and power signals among the various components of a computer.

Any source of radiant energy, especially electromagnetic energy.

A buoyant balloon rising freely in the atmosphere, as opposed to a captive balloon.

The water volume within a specified portion of a stream channel.

A sunshine recorder of the type in which the time scale is supplied by the motion of the sun. It consists essentially of a spherical lens which bums an image of the sun upon a specialty prepared card.

The unit of force in the centimeter-gram-second system of physical units, i.e. one gm cm per sec2, equal to 7.233 x 10-5 poundal.

Small particle on which water vapor condenses.

See instrument error, observational error. random error, standard error, systematic error.

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

A line drawn through all points on a map having the same amount of cloudiness.

Solar radiation scattered by particles in the atmosphere.

The maximum difference in output for any given input (within the specified range) when the value is approached first with increasing, and then with decreasing, input signals. Caused by energy absorption in the elements of the measuring instrument. Usually ...

An estimate of the temperature of an incandescent body, determined by observing the wavelength at which it is emitting with peak intensity (its color) and using that wavelength in Wien's law.

Operation mode of a communication circuit in which each end can transmit and receive, but not simultaneously.