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An instrument for measuring the frost point of the atmosphere.

Category:Meteorology

Force wind-Wind with a speed above 64 knots (73 mph); Beaufort scale numbers 12 through 17.

Category:Meteorology

For a given locality and month, an empirical expression devised for the purpose of classifying climates numerically on the basis of precipitation and evaporation.

Category:Meteorology

A box-like structure designed to protect certain meteorological instruments from exposure to direct sunlight, precipitation, and condensation, while at the same time providing adequate ventilation. Instrument shelters are painted white, have louvered side ...

Category:Meteorology

The rate of decrease of temperature with height when unsaturated air is lifted adiabatically (without exchange of heat with its surroundings). The decrease is due to expansion as the air is lifted to a lower pressure.

Category:Meteorology

A strong wind characterized by a sudden onset, a duration on the order of minutes, and a rather sudden decrease in speed.

Category:Meteorology

A particular pattern of snow sampler having an internal diameter of 1.485 inches so that each inch of water in the sample weighs one ounce.

Category:Meteorology

The center of an area of high pressure, usually accompanied by anticyclonic and outward wind flow. Also known as an anticyclone.

Category:Meteorology

Solar and terrestrial radiation directed downwards (towards the earth's surface); incoming radiation.

Category:Meteorology

The portion of the precipitation on the land which ultimately reaches the streams. especially the water from rain or melted snow that flows over the surface.

Category:Meteorology

A hygrometer which determines the amount of precipitable moisture in a given region of the atmosphere by measuring attenuation of radiant energy caused by the absorption bands of water vapor.

Category:Meteorology

An anemometer in which the sensor rotation is transmitted to a mechanical counter which directly integrates the air movement past the sensor. Used to determine total air passage (wind run). Average wind speed can be calculated from the difference between ...

Category:Meteorology

Overflowing by water of the normal confines of a stream or other body of water, or accumulation of water by drainage over areas which are not normally submerged.

Category:Meteorology

A graduated scale placed in a position so that the stage of a stream may be read directly from it. Staff gauges may be placed on bridge piers or pilings, etc., or placed on specially constructed supports.

Category:Meteorology

Same as dew-point hygrometer.

Category:Meteorology

A standard unit of atmospheric pressure, defined as the pressure exerted by a 760 mm column of mercury at standard gravity (980.665 cm/sec2 ) at O

Category:Meteorology

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

Category:Meteorology

The meteorological visual range, which can be estimated from the average extinction coefficient using the Koschmieder equation.

Category:Meteorology

Radiation coming from the solid angle of the sun's disc, as opposed to diffuse sky radiation, effective terrestrial radiation, or radiation from any other source. Direct solar radiation is measured by pyrheliometers.

Category:Meteorology

A hypothetical body which absorbs some constant fraction, between zero and one, of all electromagnetic radiation incident upon it, which fraction is the absorptivity and is independent of wavelength. Compare to black body, white body.

Category:Meteorology

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