Electromagnetic radiation lying in the wavelength interval between 0.8 micron and I millimeter. At the lower limit of this interval, the infrared radiation spectrum is bounded by visible radiation, while on its upper limit it is bounded by microwave radia ...

That portion of the record of a microbarograph between any two (or a specified small number) of successive crossings of the average pressure level (in the same direction). Analogous to microseism.

A protocol similar to RS232 which makes use of differential transmission to provide high speed data transmission over significantly longer distances.

Solar and terrestrial radiation directed downwards (towards the earth's surface); incoming radiation.

A standard interface between a computer input/output port and a peripheral device. Signal properties including time duration, voltage. and current, are specified by the Electronic Industries Association.

Same as ombrometer.

A hypothetical body which absorbs some constant fraction, between zero and one, of all electromagnetic radiation incident upon it, which fraction is the absorptivity and is independent of wavelength. Compare to black body, white body.

A hygrometer based upon the diffusion of water vapor through a porous membrane.

Wind with a speed between 17 and 21 knots (19 and 24 mph); Beaufort scale number 5.

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.

The temperature at which the liquid and solid forms of a substance may exist in equilibrium at a given pressure (usually one standard atmosphere). The true freezing point of water is known as the ice point.

An instrument for measuring the frost point of the atmosphere.

Thermometer used for measuring the lowest temperature attained during a given interval of time, for example, a day.

The outer, solid portion of the earth: the crust of the earth.

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

A hygrometer which includes an arrangement for the time recording of atmospheric humidity.

Same as Aeolian.

Erasable Programmable Read Only Memory. Programable read-only memory which can be erased, usually by ultraviolet light, and re-programmed.

A strong wind characterized by a sudden onset, a duration on the order of minutes, and a rather sudden decrease in speed.

The meteorological visual range, which can be estimated from the average extinction coefficient using the Koschmieder equation.