Stable air mass 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.
Stable Air: An air mass or portion thereof in which vertical motions are inhibited. Usually found in regions of the atmosphere where an inversion temperature profile is found.
State: The form of a substance: solid, liquid, or gas/vapour.
stable air mass - Air mass having a stable stratification in its lower layer, and consequently free from convection, having a low degree of turbulence, and containing either stratiform clouds, fog, or no clouds at all.
Stable Air- air with little or no tendency to rise, that is usually accompanied by clear dry weather.
Stable air See Absolutely stable air.
Standard atmosphere A hypothetical vertical distribution of atmospheric temperature, pressure, and density in which the air is assumed to obey the gas law and the hydrostatic equation.
Stable air layer Air layer characterized by a vertical temperature profile such that air parcels return to their original altitudes following any upward or downward displacement.
Stable Air - Air that is colder than its surroundings and as such is resistant to upward movement.
Trough - An elongated area of low pressure.
Unstable Air - generally, air which will continue to rise and accelerate when briefly forced upward
Updraft - a relatively small-scale current of air with marked upward motion ...
Unstable Air An atmospheric state warm air below cold air. Since warm air naturally rises above cold air (due to warm air being less dense than cold air), vertical movement and mixing of air layers can occur.
Unstable air
Air in which static instability exists. This condition is determined by the vertical gradients of air temperature and humidity.
Updraft ...
Unstable Air
Air that is able to rise easily, and has the potential to produce clouds, rain, and thunderstorms.
UNSTBL ...
Stable Air- Air in which temperature and humidity at various levels discourage the formation of convection currents.
Stationary Front- The border between cold and warm air masses that are not moving.
Stable airmasses generally imply the absence of 'free' vertical motion, and any ascent that does occur must be forced, i.e. frontal (dynamic) or orographic (mechanical) ascent, and the cloud structure is essentially layered.
Absolutely stable air: an atmospheric condition that exists when the environmental lapse rate is less than the moist adiabatic lapse rate.
Absolutely Stable Air - permalink - collapse
All > Science > Weather ...
Instability (Unstable Air): A state of atmosphere in which the vertical distribution of temperature allows rising, warm air to continue to rise and accelerate. This kind of motion is conducive for thunderstorm development.
conditionally unstable air—Unsaturated air that will become unstable on the condition it becomes saturated. See instability.
AIR MASS THUNDERSTORM A thunderstorm that is produced by convection within an unstable air mass through an instability mechanism.
Cold pools aloft represent regions of relatively low stability, while surface-based cold pools are regions of relatively stable air.
Sometimes in Melbourne, the night before the onset of severe fire weather conditions is calm and mild, as a shallow layer of stable air near the earth's surface - known as an atmospheric inversion - insulates the city from hot air and strengthening ...
A thunderstorm that is produced by convection within an unstable air mass through an instability mechanism.
They are produced by the interaction of a saturated stable air layer, usually an inversion, and a pattern of vertical wind shear, ...
Stable air produces horizontally homogeneous clouds. Frontal uplift creates various cloud forms depending on the composition of the front (ana-type or kata-type warm or cold front).
Inversion - a layer of very stable air. Temperature increases with height.
Subsidence inversion - sinking air compresses and becomes warmer than air below.
Capping inversion - warm air moves overtop of colder air.
Initially, stable air encounters a mountain, is lifted upward and cools through expansion as it rises. If the air cools to its saturation temperature during this process, the water vapor within condenses and becomes visible as a cloud.
Equatorial Air: Mass of humid and unstable air of equatorial circulation.
Evaporation: Transformation process from liquid water into vapor.
EL - Equilibrium Level. The level where unstable air becomes stable again.
Entrainment - The act of air being drawn into a cloud from the non-cloud environment.
Temperature inversion An extremely stable air layer in which temperature increases with altitude, the inverse of the usual temperature profile in the troposphere.
Air-Mass Thunderstorm - A localized thunderstorm that forms in a warm, moist, unstable air mass. Most frequent in the afternoon in spring and summer.
Thus, when the numerator is positive, the flux Richardson number Rf is negative for statically unstable air. When the flux Richardson number is less than 1, the flow is dynamically unstable and is turbulent.
Deep convection, such as thunderstorms, need moist and unstable air. The term DE-STABILIZE is used for air that has become unstable as a result of solar heating or a triggering mechanism such as a front or mountain. Commonly called INSTABILITY.
For very unstable air, strong turbulence makes p = 0, so that the velocity is independent of height, except for a thin transition layer that extends to a height z1. Over a grassy plain, ε is 1-2 cm and z1 is no more than 30 cm.
atmospheric instability that is obtained by computing the temperature that the air near the ground would have if it were lifted to a higher level and comparing it to the actual temperature at that altitude. Positive values indicate more stable air ...
INSTABILITY Occurs when a rising air parcel becomes less dense than the surrounding air. Since its temperature will not cool as rapidly as the surrounding environment, it will continue to rise on its own. Related terms: instability and stable air ...
cold air, represented on a weather map analysis as a relative minimum in temperature surrounded by closed isotherms. Cold pools aloft represent regions of relatively low stability, while surface-based cold pools are regions of relatively stable air.
In some states, dry lightning and unstable air are criteria. A Fire Weather Watch may be issued prior to the Red Flag Warning.Red Watch or Red BoxSlang for Tornado Watch.
 See also: Air, Surface, Cloud, Temperature, Clouds
|
