Disturbance

disturbance"In general, any agitation or disruption of a steady state. In meteorology, this has several rather loose applications: 1) used for any low or cyclone, but usually one that is relatively small in size and effect; 2) applied to an area ...

Disturbances such as large thunderstorm complexes over North Africa periodically result in vast dust and sand storms, some of which extend as high as 20,000 feet. These can be driven out to sea within the SAL as far west as North America.

Disturbance: A small area of low pressure. Diurnal:Daily. Divergence:In the atmosphere when air diverges it sinks, moves clock wise and outward creating "High Pressure" Centrifugal Force. Compressional Warming. Anti-Cyclonic conditions.

Disturbance- An area of low-pressure in which storm conditions occur. Doppler Radar- Sophisticated radar that can measure the speed and direction of moving objects, such as wind.

Disturbance - A low pressure system, a tropical area of storminess, or any area in which the weather is in a state of cloudiness, precipitation or wind.

disturbance—In meteorology, applied rather loosely: (1) any low pressure or cyclone, but usually one that is relatively small in size; (2) an area where weather, wind, pressure, etc.

Disturbance- a disruption of the atmosphere that usually refers to a low pressure area, cool air and inclement weather.

DISTURBANCE - Another name given to a region of weather in the atmosphere suggesting low pressure, such as a trough.

DISTURBANCE This has several applications. It can apply to a low or cyclone that is small in size and influence. It can also apply to an area that is exhibiting signs of cyclonic development.

A disturbance in the upper atmospheric flow pattern which is usually associated with clouds and precipitation. This disturbance is characterized by distinct cyclonic flow, a pocket of cold air, and sometimes a jet streak.

Tropical disturbance: Often the earliest stages of a tropical cyclone. Normally an organized area of thunderstorms that forms in the tropics and persists for more than 24 hours.

tropical disturbance - A migratory, organized region of convective showers and thunderstorms in the Tropics that maintains its identity for at least 24 hours but has no closed wind circulation.

TROPICAL DISTURBANCE An area of organized convection, originating in the tropics and occasionally the subtropics, that maintains its identity for 24 hours or more.

TROPICAL DISTURBANCE: An organized mass of tropical thunderstorms, with a slight cyclonic circulation, and winds less than 20 knots. TROPICAL STORM: An organized cyclone in the tropics with wind speed between 35 and 64 knots.

Tropical disturbance An organized mass of thunderstorms with a slight cyclonic wind circulation of less than 20 knots. Tropical storm Organized thunderstorms with a cyclonic wind circulation between 35 and 64 knots.

Storm - a disturbance of the atmosphere marked by wind and usually by rain, snow, hail, sleet, or thunder and lightning ...

Upper-Level Disturbance A disturbance in the upper atmospheric flow pattern which is usually associated with clouds and precipitation. This disturbance is characterized by distinct cyclonic flow, a pocket of cold air, and sometimes a jet streak.

Long wave- A disturbance or wave in the major belt of westerlies characterized by a long length (thousands of kilometers) and significant amplitude. Also called "Rossby Waves".

A small disturbance of wind in a large wind flow, which can produce turbulent conditions. They can also be areas of warmer air north of the main westerlies or colder air south of the westerlies.

M0750 Mesoscale disturbance Perturbation of mesoscale pressure and flow fields. M0760 Mesosphere Region of the atmosphere, situated between the stratopause and the mesopause, in which the temperature generally decreases with height.

Perturbation - A disturbance; often develops into a low-pressure system. Potential temperature - A measure of heat. It is the temperature air would be if brought dry adiabatically to 1000 mb.

Tropical DisturbanceA discrete tropical weather system of apparently organized convection--generally 100 to 300 mi in diameter--originating in the tropics or subtropics, ...

STORM An individual low pressure disturbance, complete with winds, clouds,and precipitation. Examples include thunderstorms, tornadoes, or even tropical cyclones. The name is associated with destructive or unpleasant weather.

Space Environment Center(SEC) - This center provides real-time monitoring and forecasting of solar and geophysical events, conducts research in solar-terrestrial physics, and develops techniques for forecasting solar and geophysical disturbances.

Geomagnetic StormIn solar-terrestraial terms, a worldwide disturbance of the earth's magnetic field, distinct from regular diurnal variations. Minor Geomagnetic Storm: A storm for which the Ap index was greater than 29 and less than 50.

Microseism 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.

occasions, particularly in mid-latitude/temperate zone regions, the flow is directed more or less directly from west to east, crossing few latitude zones within the same longitude range: this is a 'highly zonal' type - any short-wave disturbances ...

In meteorology, the term refers to a type of atmospheric disturbance centered on a low-pressure center that often results in stormy weather.

Heavy rain and Flooding a problem of any tropical disturbance Apart from the storm surge, heavy rainfall causes both flash and long term flooding.

It is also considered as a disturbance that moves through or over the surface of the medium with speed dependent on the properties of the medium. In meteorology, this applies to atmospheric waves, such as long waves and short waves.

Steering flow A basic fluid flow which exerts a strong influence upon the direction of movement of disturbances embedded in it. This is usual concept of steering in meteorology.

Acoustic Wave - (or sound wave)A three dimentional disturbance passing through an elastic or fluid medium consisting of a compression and a decompression of the medium. The wave moves through the medium at the "speed of sound' of material.

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Storm (1) An atmospheric disturbance involving perturbations of the prevailing pressure and wind fields, on scales ranging from tornadoes (1km across) to extratropical cyclones (2000-3000km across). (2) Wind with a speed between 48 and 55 knots.

Easterly Wave - A large migratory wavelike disturbance in the trade winds that sometimes triggers the formation of a hur ricane. Eccentricity - The variation of an elipse from a circle. Electromagnetic Radiation - See Radiation.

Upper Level System - A general term for any large-scale or mesoscale disturbance capable of producing upward motion (lift) in the middle or upper parts of the atmosphere. This term sometimes is used interchangeably with impulse or shortwave.

Shortwave (or Shortwave Trough) - A disturbance in the mid or upper part of the atmosphere which induces upward motion ahead of it. If other conditions are favorable, the upward motion can contribute to thunderstorm development ahead of a shortwave.

Hydraulic jump: a steady disturbance in the lee of a mountain, where the airflow passing over the mountain suddenly changes from a region of low depth and high velocity to a region of high depth and low velocity.

The surface between polar and tropical air masses, along which cyclonic disturbances form. Precipitation: Moisture that is released from the atmosphere as rain, drizzle, hail, sleet or snow, as well as dew and fog.

A scale of distance used by meteorologists to describe large weather disturbances. Weather systems which span thousands to millions of square miles and which exist for several days are on the "synoptic scale". T Tc ...

(1) the process by which radiated energy moves through space or material media; (2) energy propagated through space or through material media in the form of an advancing disturbance in electric and magnetic fields (e.g.

Their position and intensity govern general weather patterns (e.g., hot, cold, dry, stormy) over periods ranging from days to months. Smaller disturbances (e.g.

In electricity, a periodic variation of an electric current or voltage. 2. In physics, any of the series of advancing impulses set up by a vibration, pulsation, or disturbance in air or some other medium, as in the transmission of heat, light, sound, ...

to the dilution of the 14C/C ratio in atmospheric CO2 by the admixture of fossil-fuel produced CO2, but the definition has been extended to both the 14C and 13C ratios in any pool or reservoir of the carbon cycle resulting from human disturbances.

Altocumulus Lenticularis Weather: A lentil- or plate-shaped altocumulus cloud generated by the disturbance of horizontal airflow by a prominent mountain range.

See also: Weather, Air, Storm, Atmosphere, High