An instrument for measuring the frost point of the atmosphere.

A self-recording psychrometer.

The total electromagnetic radiation emitted by the sun. About 99.9 percent of its energy output falls within the wavelength interval from 0. 15 microns to 4.0 microns, with peak intensity near 0.47 microns. About one-half of the total energy in the solar ...

A self-recording thermometer.

The lowest temperature that can be obtained on a wet-bulb thermometer in any given sample of air. Obtained by evaporation of water (or ice) from the muslin wick. Used in computing dew point and relative humidity.

The depth of water that would result from the melting of snow or ice, assuming measurement on a horizontal surface and no infiltration or evaporation.

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

The atmospheric pressure at mean sea level either directly measured by stations at sea level or empirically determined from the station pressure and temperature by stations not at sea level. Used as a common reference for analyses of surface pressure patt ...

The addition of one or more redundant bits to information to verify its accuracy.

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.

Same as atmospheric pressure.

The line-of-sight distance between two objects.

The decrease of an atmospheric variable with height, the variable being temperature, unless otherwise specified.

The unit of speed in the nautical system; one nautical mile per hour. It is equal to 1.1508 statute miles per hour or 0.5144 meters per second.

check chamber-A chamber use to check the sensing elements of radiosonde equipment.

Infrared radiation emitted by or being propagated through the atmosphere.

See radiation shield.

Routine broadcast of meteorological information for aircraft in flight.

Same as balloon cover.

Growth of a cloud or precipitation particle by the collision and union of a frozen particle with a super-cooled water drop.