A hydrostatic principle that pressure supplied to an enclosed fluid is transmitted undiminished to every portion of the fluid and to the walls of the containing vessel.

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. ...

A sudden brief increase in the speed of the wind, followed by a lull or slackening. Compare to peak gust.

Same as recording rain gauge.

A photometer which measures the intensity of radiation as a function of the frequency (or wavelength) of the radiation.

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

An instrument used to measure the water vapor content of the air.

Precipitation of very small, white opaque particles of ice, fairly flat or elongated, with diameters less than 1 mm. The solid equivalent of drizzle.

The group of bits which a computer processes as a unit; often, 8 bits.

A series of Nansen-bottle water samples and associated temperature observations resulting from one release of a messenger.

Abbreviation for visual flight rules, but commonly used to refer to the relatively favorable weather and/or flight conditions to which these rules apply.

The decrease of an atmospheric variable with height, the variable being temperature, unless otherwise specified.

Situated on the side from which the wind blows.

To free something from the binding action of ice by warming it to a temperature above the melting point of ice. Also, a warm spell when ice and snow melt.

An instrument that automatically records pressure and temperature.

In thermodynamics, the integrating factor of the differential equation referred to as the first law of thermodynamics, In statistical mechanics, a measure of translational molecular kinetic energy (with three degrees of freedom). In general, the degree of ...

A measure of the relative power, or of the relative values of two flux densities, especially of sound intensities and radar power densities. The decibel is derived from the less frequently used unit, the bel, named in honor of Alexander Graham Bell.

Temperature based on an absolute scale.

The temperature at which the liquid and solid forms of a substance may exist in equilibrium at a given pressure (usually one standard atmosphere). The true freezing point of water is known as the ice point.

force wind-Wind with a speed above 64 knots (73 mph); Beaufort scale numbers 12 through 17.