The record or trace made by a microbarograph.

A measure of the attenuation due to scattering, of light as it traverses a medium containing scattering particles.

An accumulation of granular ice tufts on the windward sides of exposed objects that is formed from supercooled fog or cloud and built out directly against the wind.

Precipitation caused by the ascent of moist air over an orographic barrier such as a Mountain range.

A general term to designate apparatus designed to observe the details of weather during thunderstorms.

A component of a radiosonde consisting of a series of alternate electrically conducting and insulating strips. As these are scanned by a contact the radiosonde transmits temperature and humidity signals alternately. The contact may be a baroswitch as in t ...

Precipitation of very small, white opaque particles of ice, fairly flat or elongated, with diameters less than 1 mm. The solid equivalent of drizzle.

See stage.

A thermopile used in some types of radiation instruments. See solarimeter.

Temperature assumed by an unsaturated air parcel when brought adiabatically to a standard pressure (1,000 mb).

A rain gauge which is placed under trees or foliage to determine the rainfall in that location. By comparing this catch with that from a rain gauge set in the open. the amount of rainfall which has been intercepted by foliage can be determined.

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

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 ...

An ice coating with a consistency intermediate between glaze and rime.

A method of winds aloft observation essentially the same as a pilot balloon observation except the height data is derived from the radiosonde observation rather than from assumed ascension rates.

Wind with a speed between 28 and 55 knots (32 and 63 mph); Beaufort scale numbers 7 through 10.

A recording variometer.

Of or pertaining to the air, atmosphere, or aviation. Also, same as antenna.

The ratio of the existing amount of water vapor in the air at a given temperature to the maximum amount that could exist at that temperature. Usually expressed in percent.

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