An instrument for measuring differences of electric potential.

A large plastic constant-level balloon for duration flying at very high altitudes.

A instrument designed to study small fluctuations of some quantity. The microbarograph is an example of a recording pressure variometer.

The height ascribed to the lowest layer of clouds or obscuring phenomena when it is reported as broken, overcast, or obscuration and not classified as "thin" or "partial." The ceiling is termed unlimited when these conditions are not satisfied. ...

The record of a barograph.

Generally, an instrument designed to measure or estimate the blueness of the sky. See Linke-scale.

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

Pertaining to measurements or devices in which the output varies continuously, i.e. voltage or rotation signals. Compare to digital.

Very small precipitation drops (diameters less than 0.5 mm) that appear to float with air currents while falling in an irregular path. Unlike fog droplets, drizzle falls to the ground.

A mercury barometer arranged so that the position of the upper or lower meniscus may be measured photographically. In one design the image of the meniscus is formed on a rotating drum covered with sensitized paper so that a continuous record of pressure a ...

Same as wind sock.

Wind with a speed between 7 and 10 knots (8 and 12 mph), Beaufort scale number 3.

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

A wind scale adapted by the U.S. Forest Service for use in the forested areas of the northern Rocky Mountains (NRM). It is an adaptation of the Beaufort wind scale. The difference between these two scales lies in the specification of the visual effects of ...

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

In nautical terminology, a contraction for "weather glass" (a mercury barometer).

A radiosonde whose carrier wave is modulated by audio-frequency signals whose frequency is controlled by the sensing elements of the instrument.

Value of soil moisture, expressed as a percentage of the mass of dry soil, below which a plant living in the soil dies by wilting.

In general. the severe wind of an intense tropical cyclone (hurricane or typhoon). The term has no further technical connotation, but, unfortunately, is easily conftlsed with the strictly defined hurricane-force wind,