frontal zone—A front or zone with a marked increase of density gradient; used to denote that fronts are not truly a “surface' of discontinuity but rather a “zone' of rapid transition of meteorological elements.
polar frontal zone"In the Southern Hemisphere, the region of low salinity water between the Antarctic Polar Front and the subantarctic front.
A frontal zone formed when a cold front overtakes a warm front and, finding colder air ahead of the warm front, leaves the ground and rises up and over this denser air. Compare with cold occlusion.
A frontal zone formed when a cold front overtakes a warm front and, being colder than the air ahead of the warm front, slides under the warm front, lifting it aloft. Compare with warm occlusion.
Cold Pool ...
The frontal zone slopes up and over the colder air mass ahead of it. Warm air rides along the front (up and over the cold air mass), cooling as it rises, producing clouds and precipitation in advance of the surface warm front.
Front or frontal zone: an interface or zone of transition between two dissimilar air masses.Frontal inversion: a temperature inversion that develops aloft when warm air overruns the cold air behind a front.
1841 - Elias Loomis the first person known to attempt to devise a theory on frontal zones, and prepared some of the first known weather maps. The idea of fronts did not catch on until expanded upon by the Norwegians in the years following World War I.
criterion, many other features may distinguish a front, such as a pressure trough, a change in wind direction, a moisture discontinuity, and certain characteristic cloud and precipitation forms. The term front is used ambiguously for 1) frontal zone, ...
The temperature curve is the basic reference for locating frontal zones aloft. If the front were a sharp discontinuity, the temperature curve should show a clear cut inversion separating the lapse rates typical of cold and warm air masses.
2) Mesoscale (Sub-Synoptic Scale) Cyclone Type: This type develops in or near a dying frontal zone with horizontal wind shear.
The position of the frontal zone around the end of June to early July, indicated by the position of the jet stream, determines the general weather patterns (hot, cold, dry, wet) for the rest of the summer.
Frontolysis - The dissipation of a front or frontal zone.
Gale Warning - A warning of sustained surface winds, or frequent gusts, in the range of 34 knots (39 mph) to 47 knots (54 mph) inclusive, either predicted or occurring, ...
BAROCLINIC ZONE - A region where there is a large horizontal change in temperature, humidity, and or pressure, such as across a frontal zone.
Brickfielder: A wind from the desert in Southern Australia. Precedes the passage of a frontal zone of a low passing by. Has the same dusty character as the Harmattan. (Evert Wesker, Amsterdam, The Netherlands) ...
Air may start moving upward because of unequal surface heating, the lifting of warm air along a frontal zone, or diverging upper-level winds (these diverging winds draw air up beneath them).
Atmospheric turbulence is caused by random fluctuations in the wind flow. It can be caused by thermal or convective currents, differences in terrain and wind speed, along a frontal zone, or variation in temperature and pressure.
This is especially pronounced in stable air and catastrophic in near-isothermal conditions in a frontal zone. Some of the worst low-level icing conditions for aircraft occur in these situations, and of course, the ground isn't very far away! ...
The initial formation of a front or frontal zone. 2. In general, an increase in the horizontal gradient of an airmass property, principally density, and the development of the accompanying features of the wind field that typify a front.
It can be caused by thermal or convective currents, differences in terrain and wind speed, along a frontal zone, or variation in temperature and pressure.
 See also: Front, Air, Water, Surface, Temperature
  
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