Same as atmometer.

Ragged low clouds, usually stratus fractus. Most often applied when such clouds are moving rapidly beneath a layer of nimbostratus.

An instrument for determining the direction of cloud motion. There are two basic designs of nephoscope, the directvision nephoscope and the mirror nephoscope.

Transmitted energy which is modulated in order to carry information. Usually, it is in the form of a radio- frequency sine wave, modulated either in amplitude or in frequency.

A general term for atmospheric water in any of its forms, i.e. clouds, fog, hail, ice crystals, rain.

Any soft, gentle breeze.

A generic term for any machine that enables a human being to communicate with a computer.

A recording pressure-tube anemometer in which the wind scale of the float manometer has been made linear by the use of springs, i.e. Dines anemometer.

The nautical mile is closely related to the geographical mile which is defined as the length of one minute of arc on the earth's equator. By international agreement, the nautical mile is now defined as 1852 meters.

Same as atmospheric pressure.

An instrument for measuring the difference between incoming and outgoing terrestrial radiation.

The length of fluid flow (gas or liquid) past a sensor required for the sensor to respond to 63.2% of a step change in speed. Expressed in feet or meters. For anemometers, this value is calculated from time constant times wind tunnel speed.

Precipitation from a cumuliform cloud. Characterized by the suddenness of beginning and ending, by the rapid change in intensity, and usually by a rapid change in the condition of the sky. The solid or liquid water particles are usually bigger than the co ...

An increase in the central pressure of a pressure system; opposite of a deepening. More commonly applied to a low rather than a high.

An Instrument used to determine dew point.

A curve showing the variation of temperature with height in the free air. See lapse rate.

Winds which, over a small area, differ from those which would be appropriate to the general pressure distribution.

Wind with a speed between 28 and 33 knots (32 and 38 mph); Beaufort scale number 7.

The record made by a hygrograph.

Of or pertaining to rain.