Facing away from the wind.

A numbering system using a base number of 16 and including the ten decimal digits (0 to 9) along with six alpha digits (A to F). Thus. a digit is available to represent each of the possible values of a 4-bit binary digit.

Strong winds concentrated within a narrow band in the atmosphere. The jet stream often "steers" surface features such as front and low pressure systems.

The range through which the input may be varied without initiating a response. Usually expressed as a percentage of full-scale range.

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

Liquid water at temperatures colder than freezing.

An instrument resulting from the combination of a thermograph and a hygrograph and furnishing, on the same chart, simultaneous time recording of ambient temperature and humidity.

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

An instrument which automatically records the voltage applied to it, as a function of time.

A wave resulting from the action of wind on a water surface.

Very small precipitation drops (diameters less than 0.5 mm) that appear to float with air currents while falling in an irregular path. Unlike fog droplets, drizzle falls to the ground.

An instrument for measuring radiant energy. It consists of an ether differential thermometer with blackened bulbs. One of the bulbs is exposed to the unknown radiation and the other to a black body source whose temperature can be varied. Equality of radia ...

The condition of the atmosphere when the amount of water vapor present is the maximum possible at the existing temperature.

The general term for dry atmospheric suspensoids, including dust, haze, smoke. and sand. Compare to hydrometeor.

The total amount of water transferred to the atmosphere by evapotranspiration.

An instrument designed to record the duration of sunshine at a given location without regard to intensity. See Campbell- Stokes recorder, Jordan sunshine recorder, Marvin sunshine recorder, Pers sunshine recorder.

A forecast of weather elements of particular interest to aviation; including ceiling, visibility, upper winds, icing, turbulence, precipitation types, and storms.

The component of the radiosonde which includes the modulating blocking oscillator and the radiofrequency carrier oscillator.

A sudden brief increase in the speed of the wind, followed by a lull or slackening. Compare to peak gust.

A system of designating meteorological observing stations by number. established and administered by the World Meteorological Organization. Under this scheme, specified areas of the word are divided into "blocks" each bearing a two-number designator. Stat ...