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Clear-Air Turbulence (often abbreviated CAT and sometimes colloquially referred to as "air pockets") is the erratic movement of air masses in the absence of any visual cues (such as clouds).

turbulence - 1. Irregular fluctuations occurring in fluid motions. It is characteristic of turbulence that the fluctuations occur in all three velocity components and are unpredictable in detail; however, ...

TURBULENCE The irregular and instantaneous motions of air which is made up of a number of small of eddies that travel in the general air current. Atmospheric turbulence is caused by random fluctuations in the wind flow.

A state of fluid flow in which the instantaneous velocities exhibit irregular and apparently random fluctuations. Theses fluctuations are capable of transporting atmospheric properties.
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TURBULENCE: Disrupted flow in the atmosphere that produces gusts and eddies.
UKMET: United Kingdom forecast model.

Irregular motion of the atmosphere, as indicated by gusts and lulls in the wind.
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(Turbulent Flow) Random and continuously changing air motion which are superposed on the mean motion of the air.

Turbulence Any irregular or disturbed flow in the atmosphere that produces gusts and eddies.
Twilight The time immediately before sunrise and after sunset when the sky remain illuminated.

Turbulence - Irregular, apparently random motions of a fluid such as air or water.
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turbulence—In meteorology, any irregular or disturbed flow in the atmosphere.

TURBULENCE - Random swirling of the air felt as gusts and bumps in flight.
TWO-AXIS CONTROL - A control system consisting of only rudder and elevator or weight-shift and rudder.

TURBULENCE - Aviation term for flight affected from flying through turbulent air. Often causes the aircraft to shake, but in extreme cases can upset (through out of control) and / or damage the aircraft.

Name given to turbulence that may occur in perfectly clear air without any visual in warning in the form of clouds.

Moderate Turbulence
Turbulence that is similar to Light Turbulence but of greater intensity. Changes in altitude and/or attitude occur but the aircraft remains in positive control at all times.

Clear air turbulence (CAT) Turbulence encountered by aircraft flying through cloudless skies. Thermals, wind shear, and jet streams can each be a factor in producing CAT.

A report of inflight weather by an aircraft pilot or crew member. A complete coded report includes the following information in this order: location and/or extent of reported weather phenomenon: type of aircraft (only with reports turbulence or ...

The vertical motion of the air, at times violent, which can cause the up-and-down movement of a plane.
The name given to hurricanes in the western North Pacific Ocean, west of the International Date Line.

When observed at high levels (i.e., in cirrus formations), they may indicate severe or extreme turbulence.

It is available for every elevation angle sampled, it provides a measure of the variability of the mean radial velocity estimates due to wind shear, turbulence, and/or the quality of the velocity samples.

Clear-air turbulence Turbulence encountered by aircraft when flying through air space devoid of clouds. Thermals and wind shear are the main causes. Clinometer An instrument for measuring angles of inclination.

La variation de vitesse par rapport au radar détectée dans un volume cible donne la mesure de la turbulence de l'atmosphère entourant la cible.

wakeThe region of turbulence immediately to the rear of a solid body caused by the flow of air over or around the body.warm frontA transition zone between a mass of warm air and the colder air it is replacing.

At above 2 km altitude, the wind appears to be undisturbed by the surface, and turbulence is slight. Empirical formulas have been given for the variation of velocity with height, such as v = khα with α = 1/5 or 1/4.

These properties are interconnected by the various physical processes such as precipitation, evaporation, infrared radiation, convection, advection, and turbulence.

At the same time, the turbulence in the cumulonimbus clouds creates positively and negatively electrically-charged areas within the clouds.

Troposphere-The lowest layer of the atmosphere marked by considerable turbulence and a decrease in temperature with height. This layer stretches from the surface to approximately 10km. Weather on earth is created here.

They may be caused by turbulence and wind shear, or by upper-tropospheric convection. Sometimes they are just blown out ice-crystals spreading from the top of a dying cumulonimbus or dissolving altocumulus.

Microscale - a study of small gusts, eddies and things that last less than an hour, usually. Turbulence, diffusion, and wind shear are examples.
Millibar - an atmospheric pressure of 100 Pascals (Newtons per square metre).

air mass having static stability in its lower layers; it is free from convection, has a low degree of turbulence and may have stratiform clouds or fog, or no clouds.
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The physics usually consists of advection, radiation calculations, surface fluxes (latent, sensible heat etc.), convection, turbulence and clouds.

Eye wall: The ring of thunderstorms that surrounds a storm's eye. The heaviest rain, strongest winds and worst turbulence are normally in the eye wall. ...

Microscale - A small-sized event that is usually measured in meters and seconds to minutes; a cloud-sized phenomenon; e.g. turbulence, and dust devils.

Occurs when air moves from land to sea, and is usually associated with dry weather.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Clear Air Turbulence, Hygroscopic, Onshore Flow, outflow, Wake ...

Actually this term has nothing to do with pet cats. It is used by British meteorologists to designate a warning to pilots about Clear Air Turbulence, which is usually a cloud-free wind shear zone aloft that can make for a bumpy plane ride.

It is composed primarily of ice crystals in its higher portions and characterized by its turrets, protuberances, or crenelated tops. Its formation indicates instability and turbulence at the altitudes of occurrence.

Furthermore, the wind convergence resulting from the southwesterly and the northeasterly trade winds often cause air turbulence and whirlpool.

humidity that, upon lifting, the air parcel reaches saturation. Individual billow clouds generally have life times of a few minutes. The presence of billow clouds provides a visible signal to aviation interests of potentially dangerous turbulence.

The warm tropical air is forced to rise and become unstable with the development of large cumuliform clouds. Severe weather such as thunderstorms, squall lines and severe turbulence may accompany these cold fronts.

TurbulenceA warning issued when sustained winds of 39 to 73 miles per hour (34 to 63 knots) are expected within 24 hours.TwisterA colloquial term for a tornado.TyphoonA hurricane that forms in the Western Pacific Ocean.

See also: See also: Surface, Air, Cloud, Temperature, Weather

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