That part of snow melt that reaches stream channels as runoff.

A method of winds aloft observation accomplished by tracking a balloon-borne radar target or radiosonde with either radar or a radio theodolite.

The line-of-sight distance between two objects.

Snow shower, particularly of a very light and brief nature.

Wind with a speed between 17 and 21 knots (19 and 24 mph); Beaufort scale number 5.

Same as balloon cover.

An aneroid barometer arranged so that the deflection of the aneroid capsule actuates a pen which graphs a record on a rotating drum. Sometimes called aneroidograph.

Part of a computer word that has meaning in itself, often, a byte.

An atmospheric phenomenon, other than clouds, which obscures a portion of the sky from the point of observation. Also called obscuration.

National Weather Service. Administered by the U.S. Department of Commerce.

Atmospheric layer throughout which there is no change of temperature with height, i.e. a zero lapse rate.

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

A very sensitive electrostatic electrometer for measuring small potential differences.

The maximum deviation of any points from a straight line drawn as a "best fit" through the calibration points of an instrument with a linear response curve. Usually expressed as a percentage of full- scale range.

An instrument for measuring the pressure of the atmosphere. The two principle types are aneroid and mercurial.

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

Interational thermometric scale on which the freezing point of water equals 0

Same as wave pole.

A mercury barometer in which the lower mercury surface is larger in area than the upper surface. The basic construction of a cistern barometer is as follows: A glass tube one meter in length, sealed at one end is filled with mercury, and then inverted. Th ...

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.