Convective instability

Convective instability - The state of an unsaturated layer of air whose lapse rates of temperature and moisture are such that when lifted adiabatically to saturation, convection is spontaneous.
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convective instability"1. An instability due to the buoyancy force of heavy fluid over light fluid overcoming the stabilizing influence of viscous forces. 2. Same as potential instability. 3. Same as thermal instability.

CONVECTIVE INSTABILITY- Instability caused by very dry air advecting in the mid-levels of the troposphere over a warm and moist lower troposphere.

CISK, or "Convective Instability of the Second Kind", is a popular theory that explains how thunderstorms can evolve and organize into hurricanes.

Lifted Indices are typically -6 or lower and the advection of dry air in the mid-troposphere (3-7 km above ground) by relatively strong winds leads to high convective instability and increased downdraft potential.

As is well known, an uneven distribution of gravitational forces in the vertical can give rise to convective instability.

Instability Line: A nonfrontal surface line or belt, along which convective instability occurs.
Intensification: In synoptic meteorology, the intensification of a high-pressure center means an increase in its central pressure in time.

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.

Convective instability
Convective overshoot
Convergence zone
Cool Change
Cooperative Institute for Arctic Research
Cooperative Institute for Atmospheric Sciences and Terrestrial Applications
Cooperative Institute for Climate Applications and Research ...

The index combines the effects of low-level moisture (850 mb dew point), convective instability (Total Totals (TT) Index), jet maxima (850 mb and 500 mb wind speed), and warm air advection (veering directional shear between 850 mb and 500 mb).

(See conditional instability, absolute instability, convective instability, buoyant instability.) 2)Hydrodynamic instability (or dynamic instability) of parcel displacements or, more usually, ...

See also: Instability, Stability, Air, Surface, Pressure