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Wind with a speed between 4 and 27 knots (4 and 31 mph); Beaufort scale numbers 2 through 6.

Category:Meteorology

An instrument for measuring the intensity of direct solar radiation at normal incidence. See Angstrom compensation pyrheliometer, Eppley pyrheliometer, Michaelson actinograph. silver- disc pyrheliometer, spectropyrheliometer, waterflow pyrheliometer.

Category:Meteorology

An instrument for photographing the corona and prominences of the sun at times other than at solar eclipse.

Category:Meteorology

The inaccuracy that the manufacturer permits when the unit is calibrated in the factory.

Category:Meteorology

General name for a type of instrument which measures the inclination of the wind to the horizontal plane. See bivane.

Category:Meteorology

RDF

Radio Direction Finder.

Category:Meteorology

A device for obtaining a continuous record of stage at a point on a stream. The most common recorders consist of a float-actuated pen which traces a record on a clock driven chart.

Category:Meteorology

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

Category:Meteorology

The height at which the maximum wind speed occurs, determined in a winds-aloft observation.

Category:Meteorology

An ion counter of the aspiration condenser type, used for the measurement of the concentration and mobility of small ions in the atmosphere.

Category:Meteorology

A unit of energy per unit area commonly employed in radiation theory. Equal to one gram-calorie per square centimeter.

Category:Meteorology

The pressure exerted by the atmosphere as a consequence of gravitational attraction exerted upon the "column" of air lying directly above the point in question.

Category:Meteorology

An instrument which measures evaporation by measuring the loss of water from a burette reservoir through a ceramic disc.

Category:Meteorology

An instrument, located at the surface observing station, which is used to record the data presented by a radiosonde aloft.

Category:Meteorology

A small anemometer with flat vanes which indicates the number of linear feet or meters of air which have passed the instrument during its exposure.

Category:Meteorology

Winds from the four cardinal points of the compass; that is, north, east, south, and west winds.

Category:Meteorology

A clock-driven device for recording the time of occurrence of an event or the time interval between the occurrence of events.

Category:Meteorology

Old snow that has become granular and compacted as a result of melting and refreezing.

Category:Meteorology

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 ...

Category:Meteorology

Very generally, any moving- stream of air. It has no particular technical connotation.

Category:Meteorology

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