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A hygrometer in which the sensitive element is a strand or strands of human hair, the length of which is a function of the relative humidity of the air.

Category:Meteorology

The record of a barograph.

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A constant which describes the performance of a wind vane in response to a step change in wind direction. It is calculated from the relative amount of overshoot on two successive swings (half cycles) of a decaying oscillation. This specification is dimens ...

Category:Meteorology

The stage, on a fixed river gauge, corresponding to the top of the lowest banks within the reach for which the gauge is used as an index. Compare to flood stage.

Category:Meteorology

A type of rain gauge shield consisting of freely hanging, evenly spaced slats arranged circularly around the gauge. The advantage of this shield is that the slats do not easily accumulate snow, permitting its use on unattended gauges. See rain gauge shiel ...

Category:Meteorology

The portion of the strearnflow during any month or year derived from precipitation in previous months or years.

Category:Meteorology

A computed characteristic of a particular river basin, expressed as the time difference between the time-center of mass of rainfall and the time-center of mass of resulting runoff.

Category:Meteorology

An instrument for rapidly obtaining samples of airborne dust; a type of dust counter. Particles pass through a cylindrical chamber, are drawn at high velocity through a narrow slit, and then impinge upon a microscope cover glass located a short distance f ...

Category:Meteorology

A counterclockwise change in wind direction. Backing winds with height are indicative of cold air advection (CAA).

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A unit of luminous intensity of a light source.

Category:Meteorology

A special form of the aspiration psychrometer. developed by Assmann, in which the thermometric elements are well shielded from radiation. Psychrometric measurements may be taken with the instrument in the presence of direct solar radiation.

Category:Meteorology

An instrument for determining the dust content of a sample of air. Also spelled conimeter.

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The process whereby a position on the scale of an instrument is identified with the magnitude of the signal (or input force) actuating the instrument.

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A rain gauge which indicates but does not record the amount of precipitation captured.

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A method of streamflow routing which assumes that storage is a linear function of the weighted flow in the reach and is adaptable to a simple mathematical solution.

Category:Meteorology

Same as atmospheric pressure.

Category:Meteorology

See captive balloon, ceiling balloon, constant-level balloon, free balloon, hurricane beacon, kytoon, Moby Dick balloon, pilot balloon, radiosonde balloon, rockoon, skyhook balloon, transosonde.

Category:Meteorology

A temperature scale on which the freezing point of water equals 32

Category:Meteorology

An instrument used to determine atmospheric pressure or elevation by observing the boiling point of water or both liquids. The sensitivity of the hypsometer increases with decreasing pressure, making it more useful for high altitude work.

Category:Meteorology

The mass density of a parcel of air expressed in units of mass per volume.

Category:Meteorology

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