baroclinic model A model of atmospheric circulation that, in contrast with barotropic models, does not constrain constant-pressure surfaces to coincide with constant-density surfaces. basal sliding (basal slip) The movement or speed of movement of a glacier on its bed.
Baroclinic Zone - A region in which a temperature gradient exists on a constant pressure surface. Baroclinic zones are favored areas for strengthening and weakening systems; barotropic systems, on the other hand, do not exhibit significant changes in intensity.
Baroclinic - A state of the atmosphere in which isotherms intersect isobars. The geostrophic wind results in temperature advection, and hence disturbances modify with time. Short waves are baroclinic and therefore modify.
BAROCLINICITY- A cold air advection/warm air advection couplet that increases atmospheric instability. On analysis and forecast charts it is the isotherms crossing the height contours. ...
Has vertical structure, in the form of variable density, temperature and winds.
~ ZONE - A region where there is a large horizontal change in temperature, humidity, and or pressure, such as across a frontal zone.
Fronts - ~ divisions in the atmosphere. Zones between air masses where temperature changes quite rapidly with horizontal distance.
Cold Front - a front where the colder air is advancing and the warm air is retreating ...
~ leaf shieldA cloud pattern on satellite images - frequently noted in advance of formation of a low pressure center.~ ZoneA region in which a temperature gradient exists on a constant pressure surface.
The structure typically is most pronounced on the leading edge of the updraft, while drier air from the rear flank downdraft often erodes the clouds on the trailing side of the updraft.
~ Zone- A region in which a temperature gradient exists on a constant pressure surface.
An example is a ~ pattern. BAROGRAPH An instrument that continuously records a barometer's reading of atmospheric pressure. For an example, see aneroid barometer. BAROMETER An instrument used to measure atmospheric pressure.
(See Helmholtz instability, inertial instability, shearing instability, ~ instability, barotropic instability, rotational instability.) The space scale of unstable waves is important in meteorology: Thus Helmholtz, ~, and barotropic instability give, in general, ...
Although it is regarded as a 'single' ribbon of strength encircling the hemispheres, in reality the jet is broken and in developmental situations, can become very distorted with new jets re-forming at different levels from the 'main' ~ jet.
The deepening extratropical low accelerated as it moved southeastward along the northern side of the strengthening ~ zone and by 0000 UTC 20 May was located near 19.0°S, 101.2°E approximately 1500 km northwest of Shark Bay.
On March 12, 1993, a newly formed cyclone moved into a low level ~ zone already in place over the Gulf of Mexico and began to rapidly intensify.
The term implies both poleward displacement of the cyclone and the conversion of the cyclone's primary energy source from the release of latent heat of condensation to ~ (the temperature contrast between warm and cold air masses) processes.
~ity. In a barotropic atmosphere the geostrophic wind is independent of height. The name stems from the fact that this wind flows around areas of low (and high) temperature in the same manner as the geostrophic wind flows around areas of low (and hight) pressure.
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Browse Related Terms: ~ leaf shield, Collar Cloud, Eye Wall, Rain-free Base, Rope Cloud
Warm Advection - permalink - collapse
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Thickness charts in general and the 1000-500 hPa thinkness charts in particular are also very useful for determining ~ zones and development. Thickness lines can also indicate the steering direction of surface highs and lows.
The state of stratification in a fluid in which surfaces of constant pressure intersect surfaces of constant density. Also known as ~ity. An example is the tight temperature gradient along the East Coast of the United States during the winter that gives rise to intense cyclogenesis.
cyclone is maintained by the extraction of heat energy from the ocean at high temperatures and heat export at the low temperatures of the upper troposphere. In this they differ from extratropical cyclones, which derive their energy from horizontal temperature contrasts in the atmosphere (~ ...
with upright convection, sufficient energies are frequently present to support the formation and maintenance of thunderstorm cells. There is growing evidence supporting the role CSI plays in the development of some types of thunderstorms, particularly those occurring within strongly ~ ...
See also: What is the meaning of Pressure, Wind, Cyclone, High, Air?