Unstable air Air in which static instability prevails. This condition is determined by the vertical gradients of air temperature and humidity.
unstable air mass - Air mass having static instability in the lowest layer.
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: An atmospheric state where strong vertical motions are produced by displacement of a parcel of air that accelerates upward when the parcel is moved upward, or downward when the parcel is moved downward.
Unstable Air
Air that is able to rise easily, and has the potential to produce clouds, rain, and thunderstorms.
UNSTBL ...
Unstable Air- air that rises easily and can form clouds and rain.
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Virga- rain falling from a cloud that evaporates before reaching the ground.
Unstable air layer An air layer characterized by a vertical temperature profile such that air parcels accelerate upward or downward and away from their original altitudes.
Unstable Air - Air that is warmer than its surroundings and as such tends to rise, leading to the formation of clouds and possibly precipitation.
Unstable Air- Air with temperature differences that encourage the formation of convection currents that can produce clouds and precipitation.
Updraft- An upward current of air, usually within a thundercloud.
Unstable airmasses imply free vertical motion (given an initial trigger action), and the cloud structure is 'heaped' or cumuliform.
Unstable air: see absolutely unstable air.
Upper-air weather chart: weather maps that are produced for the portion of the atmosphere above the lower troposphere, generally at and above 850 mb.
Absolutely unstable air An atmospheric condition that exists when a lifted parcel of air is warmer than the air around it.
Absolutely Unstable 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.
Conditionally Unstable Air
An atmospheric condition that exists when the environmental lapse rate is less than the dry adiabatic lapse rate but greater than the moist adiabatic lapse rate.
Conduction ...
AIR MASS THUNDERSTORM A thunderstorm that is produced by convection within an unstable air mass through an instability mechanism.
Clouds with extensive vertical development are positive indications of unstable air. Strong upward currents in vertically developed clouds can carry high concentrations of supercooled water to high levels where temperatures are quite cold.
A thunderstorm that is produced by convection within an unstable air mass through an instability mechanism.
This movie shows surface air which is lifted into unstable air. The thin yellow line is tracing the rising air's temperature. The orange area between these curves is related to the amount of CAPE present.
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.
Air-Mass Thunderstorm - A localized thunderstorm that forms in a warm, moist, unstable air mass. Most frequent in the afternoon in spring and summer.
The condensing water releases latent heat energy allowing the air to rise higher. Very unstable air can rise to great heights condensing large quantities of water and so forming showers or even thunderstorms.
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.
When the density of the air parcel remains the same as the surrounding air after being lifted, it is also considered stable, since it does not have the tendency to rise or sink further. Contrast with unstable air and instability.
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: Unstable, Air, Surface, Temperature, Atmosphere
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