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Topic: Polar cyclone

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BBC - 16+ SOS Teacher - Geography Physical Geography mature wave cyclone The air masses north of the mid-latitude cyclone are continental polar or maritime polar air while the air masses to the south of the mid-latitude cyclone are continental tropical and/or maritime tropical. Mature wave cyclones are vast areas of low pressure which start along the polar front where cold polar air from the north collides with warm tropical air to the south. Wave cyclones are systems present in the mid-latitudes (they are also known as mid-latitude cyclones). 212.58.224.55 /schools/16/sosteacher/geography/49058.shtml   (511 words)

Air Pressure and Frontal Systems as Factors in Arctic Weather and Climate The arctic front is the boundary between polar and arctic air masses and lies to the north of the polar front. Where the temperature gradient is steep, the front is strong and is a potential site for cyclone or low pressure system development. Like the polar front, the "arctic front" is discontinuous and depends on the temperature contrast between two air masses. www-nsidc.colorado.edu /arcticmet/factors/pressure.html   (511 words)

7(s) The Mid-Latitude Cyclone Mid-latitude cyclones are the result of the dynamic interaction of warm tropical and cold polar air masses at the polar front. The cyclone begins as a weak disturbance somewhere along the frontal zone (stationary front) where cold air from polar regions meets warm air from the south (Stage 1). In their mature stage, mid-latitude cyclones have a warm front on the east side of the storm's center and a cold front to the west. www.physicalgeography.net /fundamentals/7s.html   (1295 words)

ipedia.com: Arctic cyclone Article Arctic cyclones are areas of extremely low pressure polar air and associated snowstorms that enter the high and middle latitudes. Arctic cyclones (or arctic hurricanes) are areas of extremely low pressure polar air and associated snowstorms that enter the high and middle latitudes. Starware search is an excellent resource for quality sites on arctic cyclone and much more! www.ipedia.com /arctic_cyclone.html   (1295 words)

bresch.html A full-physics model experiment, initialized 24 hours prior to the appearance of the polar low, produced a small, intense cyclone having characteristics similar to the observed low. The simulated low more closely resembled an extratropical cyclone than a typical circularly symmetric hurricane, possessing a thermal structure with front-like features and an asymmetric precipitation shield. A polar low over the Bering Sea on 7 March 1977, described by Businger and Baik (1991) as an "arctic hurricane", is investigated using observations and MM5. www.mmm.ucar.edu /sem/bresch.html   (1295 words)

Encyclopedia: Cyclone On April 27, 1999, a rare cyclone 1,100 miles in diameter was detected by the Hubble Space Telescope in the northern polar region of Mars. A mid-latitude cyclone is a weather phenomenon associated with atmospheric low pressure that takes place in the temperate region between the tropical and polar regions. Tropical cyclones (also known as tropical storms, hurricanes and typhoons) are cyclones which form over warm ocean waters and draw their energy from the evaporation and condensation of that water. www.nationmaster.com /encyclopedia/cyclone   (2604 words)

Physical Science Review 4, 2002 Weather patterns - stationary front is boundary between polar and temperate cyclone. Cyclone - ccw circulation around a low pressure in N. Hemisphere. Cyclones develop along this front and front breaks between cold and warm fronts www.warren-wilson.edu /~physics/PhysSci/Review4_2002.htm   (2604 words)

ADVECTION ASSOCIATED WITH MID-LATITUDE CYCLONES The air masses north of the mid-latitude cyclone are continental polar or maritime polar air while the air masses to the south of the mid-latitude cyclone are continental tropical and/or maritime tropical. Critical point: the position and strength of a mid-latitude cyclone will determine which air masses will be drawn toward the mid-latitude cyclone. All a forecaster has to do is look at the air masses in the immediate vicinity of a mature mid-latitude cyclone to see which air masses will be drawn into the low. www.theweatherprediction.com /habyhints/3   (435 words)

Weather Systems - Mid-Latitude Cyclones Cyclones develop from a wave form that originates where irregularities at the surface cause local shearing that distorts the polar front. Cyclones develop from a waveform that originates where irregularities at the surface cause local shearing that distorts the polar front. Mid-latitude cyclones (also called wave cyclones) may be 1,000 to 2,000 km (625-1,250 miles) across and can affect much of the continental land mass for periods of three days to as much as a week. www.mhhe.com /earthsci/geology/mcconnell/wea/mlc.htm   (553 words)

bresch.html A full-physics model experiment, initialized 24 hours prior to the appearance of the polar low, produced a small, intense cyclone having characteristics similar to the observed low. The polar low lies at the end of the spectrum of extratropical cyclogenesis in which concurrent surface fluxes of sensible and latent heat and the immediately ensuing condensation heating in organized convection dominate the development of the low-level anomaly. A polar low over the Bering Sea on 7 March 1977, described by Businger and Baik (1991) as an "arctic hurricane", is investigated using observations and MM5. uswrp.mmm.ucar.edu /sem/bresch.html   (553 words)

Storm of the Century Hits the Eastern United States Mid-latitude cyclones are low-pressure storm systems that form along the polar front—the boundary between cold polar air and warmer air from the middle latitudes. At the time, it was the fourth most costly storm of any kind in U.S. history and by far the most costly mid-latitude cyclone. By the time it was over, the storm had caused between 3 and 5 billion dollars of property damage and 270 deaths. www.classzone.com /books/earth_science/terc/content/investigations/es2003/es2003page01.cfm?chapter_no=investigation   (278 words)

Lecture Notes for Chapter 13 - Mid latitude Cyclones - Survey of Meteorology at Lyndon State College Polar Front Theory - Evolution of a mid-latitude cyclone Polar Front Theory - Evolution of a mid-latitude cyclone, cont Vertical Structure of a wave cyclone - tilted cont. apollo.lsc.vsc.edu /classes/met130/notes/chapter13   (122 words)

VOL0907.txt The USN Cyclone Class spec-ops boat is based on this design (as of 1998, 7 Cyclone Class boats were scheduled to transfer to USCG). While she won't be classed as a Royal Navy ship, she is built by DERA, the UK equivalent of ARPA. Subject: USCG subject kit wishes I'd love to see a 1/350 (or 1/700, for that matter) Secretary class cutter. smmlonline.com /archives/VOL0907.txt   (122 words)

Cyclone - Wikipedia, the free encyclopedia On April 27, 1999, a rare cyclone 1,100 miles in diameter was detected by the Hubble Space Telescope in the northern polar region of Mars. Near the center of the the cyclone the pressure gradient force, from high- to low-pressure regions, and the Coriolis force must be in an approximate balance (or else the cyclone would collapse in on itself under the pressure gradient). Cyclones are responsible for a wide variety of different meteorological phenomena such as tropical cyclones and tornadoes. en.wikipedia.org /wiki/Cyclone   (1073 words)

Polar vortex - Wikipedia, the free encyclopedia The polar vortex is a persistent, large-scale cyclone centred near the Earth 's poles, in the middle and upper troposphere and the stratosphere. The Arctic polar vortex is elongated in shape, with two centres, one roughly over Baffin Island in Canada and the other over northeast Siberia. The chemistry of the Antarctic polar vortex has created severe ozone depletion. www.wikipedia.org /wiki/Polar_vortex   (1073 words)

extratropical cyclone --  Encyclopædia Britannica According to the polar-front theory, extratropical cyclones develop when… Extratropical cyclones present a contrast to the more violent cyclones or hurricanes of the tropics, which form in regions of relatively uniform temperatures. Cyclone which devastated the city of Darwin on the night of Christmas Eve 1974, and was one of the worst natural disasters in Australia's history. www.wip.britannica.com /eb/article-9033470   (839 words)

USATODAY.com The winds pulls cold air toward the equator from the polar regions and bring warm air toward the poles. The extratropical storm's center is an area of low atmospheric pressure with winds going counterclockwise in the Northern Hemisphere, clockwise south of the equator. From fall through the winter and well into spring, extratropical storms dominate the weather across much of the United States and other parts of the globe outside the tropics. www.usatoday.com /weather/tg/wstorm/wstorm.htm   (178 words)

Oceanography In winter, the southern hemisphere is tilted away from the sun, and the band of westerly winds and associated cyclones (including the jetstream) shift further north. However, the air feeding in from the North is warmer, and the contrast between the colliding temperate air and polar air often has spectacular results - the rapid and violent escalations of a storm, fed by massive columns of spiralling air spun ever faster by strong North and South flows of warm and freezing air. In the northern hemisphere, a low pressure storm is called a typhoon, while in the southern hemisphere, it is called a cyclone. www.wavescape.co.za /top_bar/weather/oceanography.html   (178 words)

NHC/TPC Tropical Cyclone Report A strong deep-layer high pressure area to the north of the tropical cyclone induced a swift west-northwestward motion, at 20-24 kt. Microwave satellite imagery from NOAA polar-orbiting satellites, the NASA Tropical Rainfall Measuring Mission (TRMM), the NASA QuikSCAT, and Defense Meteorological Satellite Program (DMSP) satellites were also helpful in monitoring Charley. Ship reports of winds of tropical storm force associated with Charley are given in Table 2, and selected surface observations from land stations and data buoys are given in Table 3, Table 4, and Table 5. www.tpc.ncep.noaa.gov /2004charley.shtml   (3744 words)

Tropical OSEI tropical cyclone products (TRC) include multichannel color composite imagery and animations of tropical cyclones at different stages of development from polar (N4, N5, N6) and geostationary (G8, G10, G12) satellites. We cannot guarantee the availability or timely delivery of data and the server should not be used to support operational observation, forecasting, emergency or disaster mitigation operations - public or private. The following image files have recently been added to the Tropical archive... www.osei.noaa.gov /Events/Tropical   (103 words)

ESCI 343 Baroclinic instability is the instability that leeds to the formation and growth of extratropical cyclones. The vertical structure of extratropical cyclones in very different from that of tropical cyclones. The polar jet stream is located above region of tight horizontal temperature gradient. www.atmos.millersville.edu /~adecaria/ESCI343/esci343_lesson02_et_cyclones.html   (530 words)

Global Wind Systems The American meteorologist William Ferrel (1817-1891) showed how the tendency of winds to move in circles on a rotating planet gives rise to the cyclones that pull the air in from the warmer regions toward the polar front, thus driving the westerly winds. These eddies moving with the westerlies, bringing rain (cyclones) or sunshine (anti-cyclones) and are marked as the familiar “L” and “H” patterns on weather maps. The mechanism is somewhat analogous to making the trades (in that latent heat drives the convection which sucks in the air to make winds) but in this case heat is moved poleward. calspace.ucsd.edu /virtualmuseum/climatechange1/08_2.shtml   (530 words)

Mid Latitude Cyclones Thus, the mid- to upper troposphere is characterised by low pressure and temperature in the polar regions, and higher pressures and temperatures closer to the equator. Mid Latitude climates are dominated by the interaction of air masses, specifically cold air masses originating in high latitudes and warm air masses originating in the sub-tropical Highs (see the bottom of this page for a summary of the main air masses). In the mid- to upper troposphere, fronts consist of a wave-like boundaries between cold, low-pressure air, and warmer, high-pressure air. www.st-andrews.ac.uk /~dib2/climate/midlatitude.html   (4319 words)

The influence of synoptic scale transport mechanisms on trace gas relationships above the western North Atlantic Ocean, by Cooper et al. Ultimately the trace species relationships in cyclone airstreams, and their variation with season and region will be very useful for comparison to the output of chemical transport models that have the ability to resolve cyclone structure. Mid-latitude cyclones tracking from west to east are believed to be responsible for the bulk of the trace gas transport throughout the year, even in summer when these systems are weaker [Merrill and Moody, 1996]. The CCB originates north of the cyclone's warm front, and relative to the cyclone center, ascends as it heads westward, with a component heading eastward at higher altitudes. www.igac.noaa.gov /newsletter/igac24/influence.html   (2779 words)

Mid-latitude cyclone As the mid-latitude cyclone reaches maturity, the central pressure will be at its lowest and the occluded front will begin to form (as the cold front catches up to the warm front). The mid-latitude cyclone is a synoptic scale low pressure system that has cyclonic (counter-clockwise in northern hemisphere) flow that is found in the middle latitudes (i.e., 30°N-55°N) If the upper levels are favorable, then the mid-latitude cyclone will continue to develop and bring up mT air in the warm sector and bring down cP air in the cold sector. www.atmos.uiuc.edu /~snodgrss/Midlatitude_cyclone.html   (757 words)

GOES KNOWS: Weather Forecasting and Mid-Latitude Cyclones In the middle latitudes, these low pressure systems are referred to as mid-latitude or extratropical cyclones and in the tropics they are referred to as tropical cyclones or possibly even hurricanes. MLC’s are more apparent during the changes of seasons as the polar and tropical air masses are confronting eachother. Mid-latitude cyclones form between areas of contrasting temperatures and strong frontal boundaries, what type of weather do you suspect would occur as a result of this? education.gsfc.nasa.gov /experimental/July61999siteupdate/inv99Project.Site/Pages/goes.cyclone.html   (1243 words)

Sample Weather Assinment Formation: A mid-latitude cyclone usually forms as a wave on the polar front as described by the wave cyclone conceptual model developed by a group of Norwegian meteorologists early in the twentieth century (Ahrens, 2002). The thermal structure of the mid-latitude cyclone causes an increase in the sloping of the pressure surfaces (isobars) with height, which causes a stronger pressure gradient force with height which in turn causes stronger wind speeds with height. The circulation around the developing cyclone causes a synoptic scale warm front to move northward ahead of the low center and a synoptic scale cold front to move southward behind the center of the low. www.meso.com /wind-personal/glenn/170/writ-sample.htm   (3739 words)

wave_cyclone model The key to the wave cyclone model was the idea that the Sub Polar Low pressure belt served as the area of origin for daily weather in the mid latitudes. Because fronts are such an important part of weather forecasting using the mid latitude cyclone I have elected to put a somewhat fuller discussion of fronts and forecasting in the next unit. The basic ideas associated with the wave cyclone concept, and its relationship to air mass charcteristics can be grasped by examining the diagrams of a cyclone on the WW2010 server. www.ux1.eiu.edu /~cfrlw/For/Unit3/cyclone.html   (1068 words)

Glossary of Terms: M Its formation is triggered by the development of troughs in the polar jet stream. Cyclonic storm that forms primarily in the middle latitudes. A cylinder of cyclonically flowing air that form vertically in a severe thunderstorm. www.geog.ouc.bc.ca /physgeog/physgeoglos/m.html   (2434 words)

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