Stability
Storms developing in one environment can be different in character than those developing in another.
stability - 1. The characteristic of a system if sufficiently small disturbances have only small effects, either decreasing in amplitude or oscillating periodically; ...
Stability
Occurs when a rising air parcel is denser than the surrounding air.
Staccato lightning ...
Stability - Possessing the ability to return to its original position; suppresses convection.
Steering - Directing other motion. The jet stream steers surface storm systems.
Subsidence - Sinking air.
Stability - the ability of the atmosphere to suppress vertical motion, convection.
Standard atmosphere - a model of the atmosphere which represents an average for its temperature at various elevations.
stability: a state of the atmosphere when a parcel of air will return to its starting position when moved up or down. This is because the parcel of air is denser than its surrounding air. Stability is often associated with fair weather.
Stability Index The overall stability or instability of a sounding is sometimes conveniently expressed in the form of a single numerical value. Used alone, it can be quite misleading, and at times, is apt to be worthless.
stability—A state of the atmosphere in which the vertical distribution of temperature is such that a parcel will resist displacement from its initial level. (See also instability.) ...
Stability- An indication of how easily a parcel of air is lifted. If the air is very stable it is difficult to make the parcel rise. If the air is very unstable the parcel may rise on its own once started.
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.
INSTABILITY (INSTBY)- Air that if lifted adequately will rise on its own due to positive buoyancy.
INTERPOLATION- Drawing an isopleth between known numerical values.
INVERSION (INV)- A temperature increase with height.
INSTABILITY
The state of equilibrium in which a parcel of air when displaced has a tendency to move further away from its original position. It is the condition of the atmosphere when spontaneous convection and severe weather can occur.
static stability"(Also called hydrostatic stability, vertical stability.) The ability of a fluid at rest to become turbulent or laminar due to the effects of buoyancy.
STABLE/STABILITY Occurs when a rising air parcel becomes denser than the surrounding air. It will then return to its original position.
Neutral Stability
An atmospheric condition that exists in unsaturated air when the environmental lapse rate equals the dry adiabatic rate, or in saturated air when the environmental lapse rate equals the moist adiabatic rate.
NEWD ...
STABILITY - See Pitch, Roll, and Yaw Stability.
STABILIZER - A fixed horizontal or vertical surface at an aircraft's tail used to maintain straight and level flight. An elevator and rudder attached to the stabilizers deflect air during maneuvers.
Stability: the degree of resistance of a layer of air to vertical motion.Stable air: see absolutely stable air.
Stability
A semiquantitative measure of the mixing capabilities of the lower atmosphere; usually termed the Pasquill- Gifford categories.
Telemetry ...
ABSOLUTE INSTABILITY
When the lapse rate of a column of air is greater than the dry adiabatic lapse rate. The term absolute is used because this applies whether or not the air is dry or saturated.
Related term: instability ...
Absolute Stability -The condition of air that has an environmental lapse rate that is less than the wet adiabatic rate.
Absolute stability Property of an ambient air layer that is stable for both saturated (cloudy) and unsaturated (clear)air parcels.
Baroclinic instability is a situation that results from the tight thermal gradients when air parcels are unstable to slantwise forcing.
where σ is a stability parameter and f is the Coriolis parameter.
Physically, ...
Atmospheric Stability
air is stable if it is at the same density as surrounding air, so it will not tend to rise or fall but will tend to remain in place ...
POTENTIAL INSTABILITY- Also known as convective instability. Instability caused by dry air advecting over warm and humid PBL air. Lapse rate of temperature increases if lifting occurs.
Instability(abbrev. INSTBY)- The tendency for air parcels to accelerate when they are displaced from their original position; especially, the tendency to accelerate upward after being lifted.
Sounding-based Stability Index - an index calculated from balloon observations (e.g., CAPE, Lifted Index, K-Index, Bulk Richardson Number, Total-Totals Index) that provide guidance about the potential organization, type, ...
CONDITIONAL INSTABILITY Stable unsaturated air that will result in instability in the event or on the condition that the air becomes saturated. If the air is saturated, it is considered unstable; if air is unsaturated, it is considered stable.
Total-Totals IndexA stability index and severe weather forecast tool, equal to the temperature at 850 mb plus the dew point at 850 mb, minus twice the temperature at 500 mb.
A common measure of atmospheric instability. Its value is obtained by computing the temperature that air near the ground would have if it were lifted to some higher level (around 18,000 feet, usually) and comparing that temperature to the actual ...
Used in calculations of atmospheric stability. SIGMET information Meteorological information issued by a watch office concerning the occurrence or forecast of weather phenomena which may affect the safety of aircraft operations.
ACCAS clouds are a sign of instability aloft, and may precede the rapid development of thunderstorms.Accessory CloudA cloud which is dependent on a larger cloud system for development and continuance.
BRKBreakBRN(Bulk Richardson Number) A non-dimensional number relating vertical stability and vertical shear (generally, stability divided by shear).
Haines IndexThis is also called the Lower Atmosphere Stability Index. It is computed from the morning (12Z) soundings from RAOB stations across North America. The index is composed of a stability term and a moisture term.
In what the Weather Service calls a ''perpetual war of instability and equilibrium'' the battle lines are drawn.
Owing to a history of geological stability, much of Western Australia consists of a broad, relatively featureless plateau between 300 and 600 metres above mean sea level, ...
Lifted Index (or LI) - A common measure of atmospheric instability.
The Severe Weather Threat (SWEAT) Index uses atmospheric stability, wind shear, and wind speeds aloft (taken from radiosonde reports).
ENERGY-HELICITY INDEX - An important instability and directional wind-shear index for determining the severity of thunderstorms based on the CAPE and helicity present in the storm environment.
All are formed within an unstable environment (see Q/A 2A.4), and all require the following to be in place: (i) Instability through a reasonable depth of the troposphere; preferably (but NOT necessarily) extending above the freezing level; ...
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.
This is called convective instability.
The rising air now cools and the moisture in that air parcel begins to condense into ice crystals and clouds form.
The tornado is fed by vertical instability of the atmosphere, covers a very small area, and has extremely high winds.
Unstable Air Mass
Air mass having static instability in its lower layers; convective clouds and precipitation occur if its moisture content is sufficiently high.
A sudden increase in wind speed, generally lasting from a few minutes up to half an hour. Line squalls are caused by instability of cold air moving over warmer water.
Logger
Device for recording digitised data.
The hypothesis that the Earth's atmosphere, biosphere, and its living organisms behave as a single system striving to maintain a stability that is conductive to the existence of life.
General Circulation Model (GCM)(1) ...
Dry Line - A boundary which separates warm, dry air from warm, moist air. The differences in the two air masses may be significant. The dry line is usually a boundary of instability along which thunderstorms form.
Conditionally unstable air An atmospheric condition that exists when the environmental lapse rate is between the dry adiabatic rate and the moist adiabatic rate. Also called conditional instability.
Stratosphere: The region of the atmosphere extending from the tropopause (8 to 15 km altitude) to about 50 km. The temperature of the stratosphere is warmer than the upper troposphere thus making it a region of high stability and low humidity.
It can be heavily reinforced or "filled" with glass fibers or other materials. Phenolics are known for their high impact strength, excellent wear characteristics, and dimensional stability over a wide temperature range.
The regions above the troposphere have increased atmospheric stability than those below. The tropopause marks the vertical limit of most clouds and storms.
 See also: Air, Surface, Temperature, Cloud, Atmosphere
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