A colloquial term in western Australia for a squall, associated with thunder, on the northwest coast in summer.

An atmometer consisting of a porous porcelain or ceramic container connected to a calibrated reservoir filled with distilled water. Evaporation is determined by the depletion of water in the reservoir.

A balloon designed to float at a constant pressure level. This may be accomplished by a pressure valve which controls the release of ballast so as to maintain flight above a selected pressure level until the supply of ballast is exhausted. See Moby Dick b ...

A reflecting type telescope with a 45

A unit of energy equal to 101 ergs or to 0.2389 calories.

Instrument for measuring the intensity of radiant energy. Its principle is based on the variation of electrical resistance, with the incoming radiation, of one or both the metallic strips which the instrument comprises.

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

A thermograph in which ventilation is provided by a suction fan.

The standard deviation of a sufficiently large number of measurements of the same quantity by the same instrument or method. The non-correctable part of the inaccuracy of an instrument, it represents the limit of measurement precision. The uncertainty of ...

A relatively small-scale, upward moving current of air.

Automated Surface Observing System. A network of instrumented weather stations deployed primarily by the National Weather Service to make weather observations without operator involvement.

Readily taking up and retaining moisture.

The record obtained from a bolometer.

Same as ceiling light.

Anemometer which measures wind speed by the speed of rotation of 3 or 4 hemispherical or conical cups, each fixed to the end of a horizontal arm projecting from a vertical axis. See condenser-discharge anemometer, contact anemometer. Compare to bridled-cu ...

Name sometimes given to a transmissometer.

One of the radiation laws which states that the wavelength of maximum radiation intensity for a black body is inversely proportional to the absolute temperature of the radiating black body.

Interational thermometric scale on which the freezing point of water equals 0

A decrease in the central pressure of a pressure system. Usually applied to a low rather than to a high.

Same as wind sock.