The pressure unit of the meter-ton-second system of physical units. equal to 10 millibars or 101 dynes per cm2.

The direction, with respect to magnetic north, from which the wind is blowing. Distinguish from true wind direction.

Occupational Safety and Health Administration. A regulatory office of the U.S. Department of Labor.

Sustained winds greater than or equal to 40 mph or gust greater than or equal to 58 mph.

A recording siphon barometer.

A thermopile used in some types of radiation instruments. See solarimeter.

A counterclockwise change in wind direction. Backing winds with height are indicative of cold air advection (CAA).

A photometric unit of illuminance or illumination equal to one lumen per square centimeter.

Any and all forms of water particles, liquid or solid, that fall from the atmosphere and reach the ground.

An instrument for measuring the intensity of light or the relative intensity of a pair of lights. Also called an illuminometer. If the instrument is designed to measure the intensity of light as a function of wavelength, it is called a spectrophotometer. ...

A magnetometer of the electromagnetic type which is used to measure the horizontal intensity of the earth's magnetic field.

The maximum deviation of any points from a straight line drawn as a "best fit" through the calibration points of an instrument with a linear response curve. Usually expressed as a percentage of full- scale range.

An old nautical term for mercury barometer.

A self-recording thermometer.

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

A conductor or system of conductors for radiating and/or receiving radio energy. Also called aerial.

A recording magnetometer.

A type of climatic diagram whose coordinates are some form of temperature vs. a form of humidity or precipitation.

The succession of stages through which water passes on the ground and in the atmosphere: evaporation from land or bodies of water, condensation to form clouds, precipitation, accumulation in the soil or in bodies of water, and re-evaporation.

A unit of energy equal to 1.356joules.