Gradient Wind non-geostrophic winds which blow parallel to isobars
Geostrophic winds exist in locations where there are no frictional forces and the isobars are striaght. However, such locations are quite rare.
Gradient wind The same as geostrophic wind, but blowing parallel to curved isobars or contours. The curved airflow pattern around a pressure center results from a balance among pressure-gradient force, Coriolis force, and centrifugal force.
The pressure gradient force acts at right angles to isobars in the direction from high to low pressure. The greater the pressure difference over a given horizontal distance, the greater the force and hence the stronger the wind.
gradient - 1. The space rate of decrease of a function. The gradient of a function in three space dimensions is the vector normal to surfaces of constant value of the function and directed toward decreasing values, ...
Gradient wind
A steady, horizontal wind flowing along curved isobars is called gradient wind. Where there is imbalance between the pressure gradient and Coriolis forces.
gradient transport theory"A first-order turbulence closure approximation that assumes that turbulent fluxes of any variable flow down the local gradient of that mean variable; analogous to molecular transport.
Gradient - in general, the spatial change of a physical quantity (e.g., temperature)
Graupel - snow pellets or soft sleet ...
Gradient wind
A theoretical wind that results from a balance between the pressure gradient, Coriolis and centrifugal forces. It is a better approximation than the geostrophic wind as it accounts for the curvature of real weather systems.
GRADIENT WIND A steady horizontal air motion along curved parallel isobars or contours in an unchanging pressure or contour field, assuming there is no friction and no divergence or convergence.
Gradient wind - Wind that flows parallel to the isobars, but non-linearly.
Gradient The time rate or spatial rate of change of an atmospheric property.
Gradient - The direction to move to experience the greatest change in any weather quantity, such as temperature. Also the rate of that change for a specified distance travelled.
Gradient
(abbrev. GRAD) A rate of change with respect to distance of a variable quantity, as temperature or pressure, in the direction of maximum change.
Gradient High Winds ...
Gradient Wind - The curved airflow patern around a pressure center resulting from a balance among pressure-gradient force, Coriolis force, and centrifugal force.
Gradient wind A theoretical horizontal wind that blows parallel to curved isobars or contours above the friction layer.
Granules A network of huge, irregularly shaped convective cells in the sun's photosphere.
gradient—In meteorology, a horizontal decrease in value per unit distance of a parameter in the direction of maximum decrease; most commonly used with pressure, temperature, and moisture.
The Gradient Wind
In explaining the geostrophic wind, we assumed that the isobars were straight lines.
GRADIENT - See Wind Gradient.
GROUND EFFECT - The apparent floating of an aircraft near the earth's surface due to a suppression in tip vortices.
GROUND HANDLING - Moving an aircraft around while on the ground.
Pressure Gradient Force- Force acting on air that causes it to move from areas of higher pressure to areas of lower pressure.
Prevailing Wind- The direction from which the wind blows most frequently in any location.
Pressure gradient wind
The wind that results from the pressure gradient. The greater the pressure gradient between two points, the greater the wind.
Pressure Gradient-The amount of pressure change occurring over a given distance.
Radiosonde-A lightweight package of weather instruments fitted with a radio transmitter and carried up into the atmosphere by a balloon.
Pressure Gradient - the change in pressure over a given distance at a given time
Pressure Tendency - the change in pressure over a given time at a given location
Prevailing Westerlies - the westerly winds that dominant in middle latitudes ...
Pressure Gradient Force: A three-dimensional force vector operating in the atmosphere that accelerates air parcels away from regions of high pressure and toward regions of low pressure in response to an air pressure gradient.
The winds blow through low passes where major river valleys issue onto the seaways when strong east-west pressure gradients exist between the coast and the inland areas, with low pressure over the ocean.
THERMOCLINE A vertical negative temperature gradient in some layer of a body of water which is appreciably greater than the gradients above and below it.
ANOMALOUS PROPAGATION (AP)Non-standard atmospheric temperature or moisture gradients will cause all or part of the radar beam to propagate along a non-normal path.
Also called gradient wind level. Geostrophic-wind scale A graphical device used for the determination of the speed of the geostrophic wind from the isobar or contour-line spacing on a synoptic chart.
thermocline A transition layer of water in the ocean, with a steeper vertical temperature gradient than that found in the layers of ocean above and below.
Dew Point FrontA narrow zone (mesoscale feature) of extremely sharp moisture gradient and little temperature gradient. It separates moist air from dry air. Severe weather can be associated with this front.
Meteorologists refer to the force that starts the wind flowing as the "pressure gradient force." High and low pressure are relative. There's no set number that divides high and low pressure.
Pressure Gradient: The closer the isobars the faster the wind speed. Called close/tight or steep pressure gradient. The wider apart the isobars the slower the wind speed. Called: A "Weak" Pressure Gardient.
PRESRR: Pressure Rising Rapidly...
Baroclinic ZoneA region in which a temperature gradient exists on a constant pressure surface.
temperature is uniform (no temperature gradient) on a constant pressure surface. Barotropic systems are characterized by a lack of wind shear, and thus are generally unfavorable areas for severe thunderstorm development. See baroclinic zone.
The geostrophic wind results when the Coriolis force exactly balances the horizontal pressure gradient force.
Usually, in operational meteorology, references to barotropic systems refer to equivalent barotropic systems - systems in which temperature gradients exist, but are parallel to height gradients on a constant pressure surface.
Typically the pressure gradient increases (central pressure drops), winds strengthen, and clouds become more pronounced during this phase.
thermocline: A temperature gradient within layer of a body of water that is notably greater than the temperature gradients above and below it.
thermometer: an instrument used for measuring temperature.
The pressure gradient is very tight after the front passes by and the winds can reach speeds of 50-60 mph.
There is a strong 500-1000 hPa gradient involved. There is appreciable disturbance of the tropopause in the vicinity of the storm, particularly to the rear in the 'dry slot', ...
An experiment to obtain data to study the average radiation budget of the Earth and determine the energy transport gradient from the equator to the poles.
Browse Related Terms: Atmospheric pressure, Barogram, PRES, Pressure, Pressure Gage, Pressure Gradient, Pressure Gradient Force, Pressure head, Pressure Jump, Saturation Vapor Pressure, Vapor Pressure ...
Earth Radiation Budget Experiment (ERBE) An experiment to obtain data to study the average radiation budget of the Earth and determine the energy transport gradient from the equator to the poles.
COL - A saddle like reqion between two low pressure systems where a shallow pressure gradient exists. This region may also be found when high pressure systems around the two low pressure areas are situated on each side of the col region.
Land and Sea Breezes: Local winds caused by the unequal warming and cooling of adjacent water and land surfaces under the influence of solar radiation (during the day) and land radiation (during the night), which produce a pressure gradient (ratio of ...
BAROCLINITY The state of stratification in a fluid in which surfaces of constant pressure intersect surfaces of constant density. Also known as baroclinicity. An example is the tight temperature gradient along the East Coast of the United States ...
Those events are bound by the variables that exist in Earth's atmosphere. They are temperature, pressure, water vapor, and the gradients and interactions of each variable, and how they change in time.
Geostrophic wind A theoretical horizontal wind blowing in a straight path, parallel to the isobars or contours, at a constant speed. The geostrophic wind results when the Coriolis force exactly balances the horizontal pressure gradient force.
 See also: Air, Pressure, Surface, Temperature, Force
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