Same as dropsonde.

A liquid-in-glass thermometer which uses an organic substance such as alcohol as the thermometer liquid. This type of thermometer has a low freezing point and a high coefficient of expansion. It is less accurate, however, than a mercury thermometer.

A measure, proposed by Angstrom, of the precipitation effectiveness of a region.

Wind with a speed between 41 and 47 knots (47 and 54 mph); Beaufort scale number 9.

Any soft, gentle breeze.

Same as evaporative power.

For a given location, a measure of the long-range effectiveness of precipitation in promoting plant growth. Also called precipitation-evaporation index.

Generally, an instrument designed to measure or estimate the blueness of the sky. See Linke-scale.

A chronograph used to make a time-record of certain measured meteorological elements. The most common type, the triple register, records wind direction and speed, duration of sunshine, and amount of rainfall (sensed respectively by a contact anemometer, M ...

The processing of the form or mode of a signal so as to make it intelligible to, or compatible with, a given device.

A scale of yellows, greens, and blues for recording the color of sea water, as seen against the white background of a Secchi disk.

Same as windsock.

Programs or instructions which are stored in readonly memory.

A basic equation in night visual range theory, relating the illuminance of a point source of light to distance and the transmissivity of the atmosphere.

Precipitation of white, opaque, spherical or conical ice particles that are crisp and easily crushed and that have diameters of 2 to 5 mm.

An estimate of the temperature of an incandescent body, determined by observing the wavelength at which it is emitting with peak intensity (its color) and using that wavelength in Wien's law.

The number of cycles per second between the limits of a frequency band.

A captive balloon used to maintain meteorological equipment aloft at approximately a constant height. The kytoon is streamlined and combines the aerodynamic properties of a balloon and a kite.

Very generally, any moving- stream of air. It has no particular technical connotation.

Of or pertaining to rain.