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Topic: Anticyclone

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All anticyclones are produced by dry air that settles to the surface of the earth and accumulates, forming air masses.
Anticyclones generally bring fair weather and clear skies as the dynamics of an anticyclone lead to downward vertical movement which suppresses convective activity and generally lowers the mean relative humidity, in contrast to the upward vertical movement in a cyclone.
In winter anticyclonic weather is characterized by clear air with periods of frost, causing fogs in towns and low-lying damp areas, and in summer by still cloudless days with gentle variable airs and fine weather.
www.reference.com /browse/wiki/Anticyclone   (1116 words)

 anticyclone - HighBeam Encyclopedia
anticyclone region of high atmospheric pressure; anticyclones are commonly referred to as "highs." The pressure gradient, or change between the core of the anticyclone and its surroundings, combined with the Coriolis effect, causes air to circulate about the core in a clockwise direction in the Northern Hemisphere and a counterclockwise direction in the Southern Hemisphere.
Many low-level anticyclones are swept generally eastward by the prevailing west-to-east flow of the upper atmosphere, usually traversing some 500 to 1,000 mi (800-1,600 km) per day.
The term anticyclone is derived from the fact that the associated rotational direction and general weather characteristics of an anticylone are opposite to those of a cyclone.
www.encyclopedia.com /doc/1E1-anticycl.html   (364 words)

 Anticyclone - Wikipedia, the free encyclopedia
An anticyclone composed of warm dry air may be situated over much of the North Atlantic ocean during most of the year.
The anticyclone that is located there is practically a mirror-image of the anticyclone that is located over the North Atlantic ocean.
The rotation is caused by the movement of colder higher pressure air that is moving away from the poles towards the equator being affected by the rotation of the earth.
en.wikipedia.org /wiki/Anticyclone   (1277 words)

In addition, winds associated with an anticyclone are usually very light if present at all, especially close to the centre of the high-pressure system.
Anticyclones move, but not quite in the same purposeful way as travelling depressions.
A ridge of high pressure is a wedge-shaped extension of an anticyclone or belt of high pressure.
www.ace.mmu.ac.uk /eae/Weather/Older/Anticyclones.html   (446 words)

 Geography > Weather and climate Anticyclones and Definitions
Anticyclones can be very large, typically at least 3,000 km wide.
Winds are very gentle or even calm in an anticyclone, move clockwise, and this is shown on a synoptic chart by wide spaced isobars.
An anticyclone's very stable conditions and little air movement means that pollution is trapped at low levels, resulting in very poor air quality such as smogs.
sixthsense.osfc.ac.uk /geography/pages/weather_climate/index.asp   (964 words)

 BBC - Gloucestershire Weather - Anticyclones
The air within an anticyclone is sinking as it is drawn down from the higher part of the atmosphere, the troposphere.
Whilst this usually holds true, there are exceptions to the rule and in both summer and winter, even a pressure in excess of 1030 millibars may not be enough to prevent heavy rain from falling from an active weather front.
Anticyclones are generally much slower moving than cyclones, or depressions as they are more commonly known.
www.bbc.co.uk /gloucestershire/weather/2004/04/anticyclones.shtml   (704 words)

 Highbeam Encyclopedia - Search Results for anticyclone
anticyclone region of high atmospheric pressure; anticyclones are commonly referred to as highs.
He turned from exploration and meteorology (where he introduced the theory of the anticyclone) to the study of heredity and eugenics (a term that he coined).
Isobars are used to define cyclones (low-pressure regions) and anticyclones (high-pressure regions).
www.encyclopedia.com /SearchResults.aspx?Q=anticyclone   (397 words)

 Reading the Weather: Ch 3   (Site not responding. Last check: 2007-11-03)
While these anticyclones that float down and to the right of their normal path linger longer, they are never so severely cold, nor, alas, so uniformly clear as the others.
It is a profound law of anticyclones and even more particularly of cyclones, that if they deviate to the right they weaken, if they are pushed by an obstacle to the left they increase greatly in in­tensity.
The intensity of an anticyclone is measured by its wind velocity and by the degree of cold obtaining under its influence.
www.kellscraft.com /ReadingWeather/readingweather03.html   (4492 words)

 What is_an_anticyclone?
It is associated with relatively high pressure at the surface and in the lower troposphere.
Anticyclones usually form when an airmass is cooled over a cool ocean surface, or over land during the fall, winter, or spring when little sunlight is available.
The strongest anticyclones occur over Asia and North America in the winter when clear air and little sunlight causes the formation of large cold air masses.
www.weatherquestions.com /What_is_an_anticyclone.htm   (185 words)

 TOS 1998 poster: upwelling   (Site not responding. Last check: 2007-11-03)
The situation was modelled with a stationary anticyclone (Figure 6) which in shallow water of uniform depth produces Ekman layers at the surface and at the bottom:
When the same atmospheric anticyclone was applied to a model bight with uniform depth the velocity field followed the coast with uniform strength around the bight; the existence of a shallow region in the west affected this pattern only slightly (Figure 8).
The process responsible for the observed coastal upwelling along the eastern coast of the Bight and its absence along the central and western coast is thus the mismatch between the atmospheric anticyclone and the resulting anticyclonic oceanic circulation in the Bight.
www.es.flinders.edu.au /~mattom/GAB/upwelling.html   (366 words)

 Cyclone and Anticyclone | Scholastic.com
For meteorologists, a cyclone —; and its counterpart, an anticyclone — is a large-scale system of air circulation in the atmosphere in the zones between the equator and either of the poles.
That is, an anticyclone's central air pressure is higher than that of its surroundings, and the airflow is counterclockwise in the Southern Hemisphere and clockwise in the Northern Hemisphere.
Anticyclones are usually characterized by low-level divergence and subsiding air.
content.scholastic.com /browse/article.jsp?id=5178   (1015 words)

 Reading the Weather: Ch 4   (Site not responding. Last check: 2007-11-03)
And if the anti­cyclones and cyclones were all of the same in­tensity it is conceivable that the rainy Sundays might go on until the Day of Rest was changed by Statute.
The cyclone thus is tails to the anticyclone's heads, the reverse of the coin.
To mentally visualize the splendid sweep of the ele­ments on their transcontinental run is to glimpse grandeur in the order of things which will go far to offset the petty annoyances of fog or sleet Ignorance may be bliss, but knowledge is preparedness.
www.kellscraft.com /ReadingWeather/readingweather04.html   (4361 words)

 Let the Rain Come Down, Alaska Science Forum
An anticyclone has higher pressure in its center than around its edges, so the air tries to flow away from the high-pressure core.
Air from higher up in the core of the anticyclone moves downward to replace this lost air, producing the general downward movement.
Now and then the anticyclone is disrupted enough to allow a few thunderstorms to form, but they aren't doing the crops much good.
www.gi.alaska.edu /ScienceForum/ASF8/880.html   (724 words)

 2.3 Low Tropospheric Anticyclonic Vortices   (Site not responding. Last check: 2007-11-03)
During this stage the center line of the cloud band can be pushed to 10°N. Formations of tropical depressions are often observed along the zone in which Southern and Northern Hemisphere air begins interacting with large horizontal wind shear and cyclonic relative vorticity.
The anticyclone center is encircled entirely by the air from the Southern Hemisphere.
The anticyclonic flow is still strong enough to resist the southeastward movement of a mid-latitude cold front.
www.nrlmry.navy.mil /~chu/chap2/se203.htm   (453 words)

 Anticyclone - Search Results - MSN Encarta
Anticyclone, large, rotating wind system centred around a region of high atmospheric pressure.
The other major weather system found in the temperate zone is the anticyclone or high.
Cyclone, in meteorology, an area of low atmospheric pressure surrounded by a wind system blowing (in the northern hemisphere) in an anticlockwise...
uk.encarta.msn.com /Anticyclone.html   (108 words)

 Simulations of the stratosphere with a steady troposphere
The stationary anticyclone acts to reduce the strength of the polar cyclone during the warming period.
Note the movement of the cyclone away from the pole and its reduction in size as it is pulled around the anticyclone.
The wave 1 forced warmings are associated with the generation of a series of travelling anticyclones which continually strengthen a quasi-stationary anticyclone.
ugamp.nerc.ac.uk /hot/ag/ag.htm   (606 words)

 TrustWatch Search
The opposite to an anticyclone is the cyclone or depression.
An anticyclone is a region of high atmospheric pressure relative to the surrounding air, generally thousands of kilometres in diameter and...
anticyclone any large wind system occurring in regions outside the equatorial belt and rotating about a centre of high atmospheric pressure...
www.trustwatch.com /search?q=Anticyclone   (257 words)

 IUGG 2003 Scientific Program
The seasonal evolution of the two anomalous anticyclones is summarized as follows: From June to August of the first year of the TBO cycle, the low-level circulation anomalies are dominated by an elongated anticyclonic ridge extending from the maritime continent to India.
Associated with this anticyclonic ridge is a tilted belt of pronounced anomalous westerlies extending from the Bay of Bengal to the WNP, suppressed convection over the maritime continent, and enhanced convection over the Philippine Sea.
The former is a result of the weakening of the fall SIO anticyclone, while the later results from the amplification and eastward migration of the Philippine anticyclone.
www.olympus.net /IAPSO/abstracts03/JSP02/03/016015-1.html   (501 words)

In the winter anticyclones bring cold and dry weather, in the early morning there will be frost and fog.
Thunderstorms often occur at the end of an anticyclone in the summer.
Anticyclones move slowly and so last for several days or several weeks.
website.lineone.net /~skillswork/front.htm   (275 words)

 FSL Model Verification: A Collection of Case Studies for Mesoscale Circulations
Associated with it was a persistent area of light to perhaps moderate low-density snow mainly over the srn/wrn DEN suburbs in the aftn/evening of the 6th.
A nice snowband did occur on the plains but appeared to be at the leading edge of the trough and surge of NWly low level flow, and proceeded to move from near the foothills at 13-14 UTC to vicinity of AKO by ~1800 UTC.
Setup was a shortwave moving south in the upper level ~nly flow with an accompanying LGM Anticyclone type surge.
laps.fsl.noaa.gov /szoke/mesoconf/cases_homepage.html   (8446 words)

 A mechanism for moistening the lower stratosphere involving the Asian Summer Monsoon
(a) Undisturbed case: Gradients of potential vorticity north of the monsoon anticyclone, which are associated with the dynamical tropopause, act as a barrier to meridional motions.
Transport is around the anticyclone and moist air is quasi-confined to the region of the anticyclone.
Some of the moisture for these events is supplied by transport of moist air from the monsoon anticyclone along upper tropospheric jet streams that lie near the dynamical tropopause.
ugamp.nerc.ac.uk /hot/ad/ad.htm   (969 words)

 Active Camera 2004
Anticyclone say that this is due to FS2004 conflicts in an area not covered by the SDK.
It would not surprise me if some of its features appeared as a standard part of the next MS Flight Simulator version, and there would be no greater accolade than that.
The team at Anticyclone are to be commended for this unique and ground-breaking product, that has introduced a whole new dimension to the "View" capabilities of FS2004.
www.avsim.com /pages/1104/acam/ActiveCamera.htm   (2102 words)

 Deep convective influence on the Asian summer monsoon anticyclone and associated tracer variability observed with ...
The Asian summer monsoon anticyclone is linked to climatological deep convection over Southeast Asia, and the coupling of circulation and convection strongly influences constituent behavior in the upper troposphere – lower stratosphere (UTLS).
We show that these convective events trigger variations of the anticyclone itself, with strong correlations between OLR and the area of low potential vorticity (PV) defining the anticyclone.
Idealized transport calculations are used to demonstrate that constituent anomalies are confined within the upper tropospheric anticyclone, and this confinement contributes to the climatological constituent patterns observed during summer.
www.agu.org /pubs/crossref/2006/2005JD006490.shtml   (353 words)

 ANTICYCLONES   (Site not responding. Last check: 2007-11-03)
Circulation over UK is ‘anticyclonic’ for 25% of the year.
This disrupts usual westerly flow, sometimes for weeks and this results in a marked change from usual temperatures, precipitation and sunshine.
‘Blocking highs’ are warm anticyclones, so influence extends into upper troposphere, diverting the jet stream (see Fig 11.5) from zonal (west-east) pattern to meridional (north-south) pattern.
www.geographypages.co.uk /anticyclone.htm   (381 words)

 IGEMS/ISC   (Site not responding. Last check: 2007-11-03)
An anticyclone is up of circulating winds at very high atmospheric high pressure.
In the northern hemisphers these winds move clockwise from the center.
In the southern hemisphere the winds move counterclockwise and usually bring calmer weather.
www.k12science.org /curriculum/downwind/airmodel/definitions/anticyclone.html   (50 words)

 anticyclone - OneLook Dictionary Search
ANTICYCLONE : 1911 edition of the Encyclopedia Britannica [home, info]
Anticyclone : National Weather Service Glossary [home, info]
Phrases that include anticyclone: arctic anticyclone, azores anticyclone, cold-core anticyclone, cold anticyclone, cold core anticyclone, more...
www.onelook.com /?w=anticyclone   (249 words)

 AllRefer.com - anticyclone (Weather And Climate: Terms And Concepts) - Encyclopedia
AllRefer.com - anticyclone (Weather And Climate: Terms And Concepts) - Encyclopedia
You are here : AllRefer.com > Reference > Encyclopedia > Weather And Climate: Terms And Concepts > anticyclone
Many low-level anticyclones are swept generally eastward by the prevailing west-to-east flow of the upper atmosphere, usually traversing some 500 to 1,000 mi (800–1,600 km) per day.
reference.allrefer.com /encyclopedia/A/anticycl.html   (346 words)

 Anticyclone Systems Ltd WxProc overview
WxProc is an advanced APT Weather Satellite image processing engine designed from the ground up with future technology in mind.
The main processing engine is based around the core design used in the Anticyclone Systems WxWatch software and as such it able to import images in this format as well as others graphics formats such as GIF and JPEG.
The original WxWatch system is designed to run on specific hardware but the new WxProc software has been entirely realised in pure Sun Microsystems Java 2.
www.anticyclone.myzen.co.uk /product_wxproc.html   (498 words)

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