An elongated area of relatively high pressure. Usually associated with and most clearly identified as an area of maximum anticyclonic curvature of the wind flow. The opposite of a trough.

A term used to describe a sensor (or sensors), the associated transducer(s), and the data readout or recording device.

Name sometimes used in place of pyranometer as a generic term.

A type of wind vane having a split or V-shaped tail. The apex orients itself to the direction of the wind.

Any horizontal wind velocity tangent to the contour line of a constant pressure surface (or to the isobar of a geopotential surface) at the point in question.

A feeble oscillatory disturbance of the earth's crust, detectable only by very sensitive seismographs. Certain types of microseisms seem to be closely correlated with pressure disturbances. See microbarm.

The transducer of any hygrometer, i.e. that part of a hygrometer that quantitatively "senses" atmospheric water vapor.

One of several constant-pressure levels in the atmosphere for which a complete evaluation of data derived from upper air observations is required.

The closeness of agreement among measurements of the same value of the same quantity where the individual measurements are made under different defined conditions, i.e. by different methods or with different measuring instruments.

A photoelectric spectrophotometer which is used in the determination of the ozone content of the atmosphere.

A colorless and odorless gaseous element. The lightest and apparently the most abundant chemical element in the universe. However, it is found only in trace quantities in the observable portion of our atmosphere, only about 0.00005 percent by volume of dr ...

Of or pertaining to rain.

Apparatus designed to measure and record the size distribution of raindrops as they occur in the atmosphere.

A unit of luminous flux. The lumen is equal to the luminous flux radiated into a unit solid angle (steradian) from a small source having a luminous intensity of one candle. An ideal source possessing an intensity of one candle in every direction would rad ...

Wind with a speed between 34 and 40 knots (39 and 46 mph); Beaufort scale number 8.

Particle on which the freezing of water occurs.

The algebraic difference between the upper and lower limits of the measuring range of an instrument, i.e. a thermometer with a range of -35 to 50

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

The record or trace made by a microbarograph.

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.