The direction toward which the wind is blowing; with the wind.

A pyranometer developed by M. Robitzsch. Its design utilizes three bimetallic strips which are exposed horizontally at the center of a hemispherical glass bowl. The outer strips are white reflectors and the center strip is a blackened absorber. The bimeta ...

The standard deviation (positive square-root of the variation) of the errors associated with physical measurements of an unknown quantity, or statistical estimates of an unknown parameter or of a random variable.

A clockwise change in wind direction. Veering winds with height are indicative of warm air advection (WAA).

The actual lifting force of an inflated balloon, usually expressed in grams.

The record or trace made by a microbarograph.

A basic equation in daytime visual range theory, relating the apparent luminance of a distant black object, the apparent luminance of the background sky above the horizon, and the extinction coefficient of the atmosphere, or the air layer near the ground. ...

A synoptic code approved by the World Meteorological Organization in which the observable meteorological elements are encoded and transmitted in "words" of five numerical digits length. Often abbreviated synoptic code.

Wind with a speed below 1 knot (1 mph); Beaufort scale number 0.

A reflecting type telescope with a 45

A rainbow seen in the spray of the ocean. It is optically the same phenomenon as the ordinary rainbow.

Same as rain-intensity gauge.

An instrument for photographing the corona and prominences of the sun at times other than at solar eclipse.

An anemometer which derives wind speed from measurements of dynamic wind pressures. Wind blowing into a tube develops a pressure greater than the static pressure, while wind blowing across a tube develops a pressure less than the static. This pressure dif ...

An element that can control current without moving parts, heated filaments, or vacuum gaps.

A hypothetical temperature characterized by a complete absence of heat and defined as 0 K, -273.15 C, or -459.67 F.

Same as windsock.

The physical exposure of an instrument. The effect of immediate environment upon the representativeness of the measurements obtained by meteorological instruments is considerable and not always correctable. The purpose of the instrument shelter is to prov ...

Cathode Ray Tube. A display element, consisting of a vacuum tube and screen, used with computers.

The mass density of a parcel of air expressed in units of mass per volume.