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Topic: High pressure meteorology

	High pressure - Wikipedia, the free encyclopedia
		High pressure science and engineering is studying the effects of high pressure on materials and the design and construction of devices, such as a diamond anvil cell, which can create high pressure.
		It was by applying high pressure as well as high temperature to carbon that man-made diamonds were first produced as well as many other interesting discoveries.
		High pressure experimentation has led to the discovery of the types of minerals which are believed to exist in core of the Earth, such as perovskite which is thought to make up half of the Earth's bulk.
	en.wikipedia.org /wiki/High_pressure (244 words)

	Meteorology - LoveToKnow Watches
		Physical meteorology is again subdivided according as we consider either the changes that depend upon the motions of masses of air or those that depend upon the motions of the gaseous molecules; the former belong to hydrodynamics, and the latter are mostly comprised under thermodynamics, optics and electricity.
		The pressure, temperature and volume of the ideal gas are connected by the equation pv = RT, where T is the absolute temperature or 273° plus the centigrade temperature p is the barometric pressure in millimetres and v the volume of a unit mass of gas, or the reciprocal of the density of the gas.
		The pressure is supposed to interest the engineer and navigator, but the velocity is the fundamental meteorological datum; in fact, the pressure of the wind varies with the nature of the obstacle, the method of exposure, the density of the air, and even the mass of rain carried along with it.
	www.1911encyclopedia.org /Meteorology (11289 words)

	High pressure area - Wikipedia, the free encyclopedia
		A high, high-pressure cell, or high pressure area is a region where the atmospheric pressure is greater than the surrounding area.
		Climatologically, high pressure forms at the Horse Latitudes as a result of air which has been uplifted at the equator, transported poleward, and cooled.
		Surface high pressure systems tend to be larger in area and have weaker surface winds than low pressure systems, due to the addition of surface friction to the pressure gradient and coriolis effect that drives the circulation.
	en.wikipedia.org /wiki/High_pressure_area (320 words)

	Atmospheric Pressure
		Pressure is a force, or weight, exerted on a surface per unit area, and is measured in Pascals (Pa).
		The pressure exerted by a kilogram mass on a surface equals 9.8 Pa. The pressure exerted by the whole atmosphere on the Earth’s surface is approximately 100,000 Pa. Usually, atmospheric pressure is quoted in millibars (mb).
		In fact, the air moving from high to low pressure follows a spiralling route due to the rotation of the Earth beneath the moving air, which causes an apparent deflection of the wind to the right in the Northern Hemisphere, and to the left in the Southern Hemisphere.
	www.ace.mmu.ac.uk /eae/Weather/Older/Pressure.html (421 words)

	High and Low Pressure Systems
		High pressure systems, on the other hand, tend to be of two types: either the semi-permanent systems that occupy the central portions of the Pacific and Atlantic Oceans, or the large systems that represent the large domes of cold (cool) air that invade southern latitudes following the passage of lows.
		Around a ridge or high pressure system, the wind speed is stronger than it would have been if it were blowing in a straight line (called supergeostrophic).
		High pressure systems are marked by low-level divergence, upper-level convergence, sinking motion, and clear skies.
	okfirst.ocs.ou.edu /train/meteorology/HiLowSystems.html (663 words)

	BOM_Air pressure
		A high pressure system (anticyclone), is a system of closed isobars surrounding a region of relatively high pressure.
		When the high pressure system is located over land the weather will be typically dry and free of cloud.
		An elongated extension of isobars away from a low pressure centre is known as a trough of low pressure.
	www.bom.gov.au /lam/Students_Teachers/pressure.shtml (828 words)

	High Surf Terminology - Pacific Disaster Center (PDC)
		The atmospheric pressure at the center of a high or low: the highest pressure of a high; the lowest pressure of a low.
		A decrease in central pressure of a cyclone.
		A unit of atmospheric pressure, normal surface pressure is approximately 1013 millibars (29.92 inches of mercury).
	www.pdc.org /iweb/high_surf_terms.jsp (1794 words)

	Meteorology - MSN Encarta
		The passage of the front is often accompanied by the heaviest precipitation and the strongest and gustiest winds.
		As the warm front passes, the air temperature and humidity rise, the atmospheric pressure stops falling, the winds shift, the rain ends, and the fog dissipates.
		The boundary is a trough of low pressure, with (in the northern hemisphere) warm air to the south and cold air to the north.
	encarta.msn.com /encyclopedia_761571037_5/Meteorology.html (1803 words)

	Atmospheric Pressure - Page 4 (Site not responding. Last check: 2007-10-25)
		In meteorology, the atmospheric pressure we normally desire to measure is the "static" pressure; i.e., that pressure resulting from Brownian motion in air plus the pressure resulting from gravity pulling those molecules toward the earth.
		Atmospheric pressure, especially the changes in air pressure, plays a significant role and is closely correlated to the type of weather which occurs at a location.
		Because one area has a higher pressure (force/area) than another, we know that the horizontal pressure in that area is the same as the downward pressure, so, air molecules will move horizontally from the region of high pressure toward the region of low pressure.
	www.met.tamu.edu /class/Metr304/Pressuredir/pressure-pg4.html (448 words)

	Meteorology \| Simulations
		Pressure gradient and Coriolis forces were seen to interact to produce geostrophic balance, a useful approximation in the free atmosphere.
		Returning to the motion of the high pressure cell itself, we developed the concept that pressure systems move through the atmosphere not because they are blown around but in response to patterns of divergent and convergent wind flow aloft.
		Greater atmospheric thickness and high pressure aloft were seen to occur in warm air layers, with opposite conditions prevailing (lesser thickness, low pressure aloft) in cold air layers.
	highered.mcgraw-hill.com /sites/0073659630/student_view0/chapter7/simulations.html (308 words)

	Meteorology - Printer-friendly - MSN Encarta
		Winds tend to develop into rotating eddies, called high and low pressure areas, that move across the middle latitudes and complicate the wind flow pattern.
		As the surface air moves outward from the surface highs, the air aloft sinks to replace it and warms by compression, which tends to evaporate any clouds in it.
		Because the sun is overhead in the northern hemisphere in July and overhead in the southern hemisphere in January, the major surface wind belts and pressure systems shift northward in July and southward in January.
	encarta.msn.com /text_761571037___14/Meteorology.html (880 words)

	Meteorology Primer (Site not responding. Last check: 2007-10-25)
		High pressure centers often represent the centers of anticyclones.
		A high pressure center is represented on a weather map by a blue "H" and air diverges outward from a surface high.
		Northerly winds associated with an approaching high are likely to result in colder temperatures while southerly winds found on the backside of a high, or once a high has passed through, typically result in a warming trend.
	www.weatherwarehouse.com /primer.htm (977 words)

	Sea Level Pressure (Site not responding. Last check: 2007-10-25)
		Pressure units used on the 4-panel map of pressure are in millibars mb.
		A high pressure center is identified on a map by using a blue H while a red L signifies a low pressure center as seen in Figure 6.
		Because high pressure is in place, the weather in Central Canada can be expected to be fair with few clouds and precipitation with light winds due to the spacing of isobars.
	www.personal.psu.edu /dsb175/SLP (1838 words)

	Fast, high, cold wind (Site not responding. Last check: 2007-10-25)
		Whether it's high in the atmosphere or down on the field, air is always being driven by pressure differentials.
		At the high altitudes of the jet stream, pressure is much higher in warm air.
		In the atmosphere, a quick drop in pressure -- marked on a weather map by areas with close pressure lines -- is equivalent to those multiple shoves.
	whyfiles.org /123snow/4.html (1355 words)

	High Pressure Centers: also known as anticyclones
		A high pressure center is where the pressure has been measured to be the highest relative to its surroundings.
		A high pressure center also represents the center of an anticyclone and is indicated on a weather map by a blue "H".
		Sinking air in the vicinity of a high pressure center suppresses the upward motions needed to support the development of clouds and precipitation.
	ww2010.atmos.uiuc.edu /(Gl)/guides/mtr/fw/prs/hghdef.rxml (164 words)

	Meteorology
		Meteorology is the study of the changes in temperature, air pressure, moisture, and wind direction in the troposphere.
		The winds move heat from the tropical regions toward the poles in a never-ending effort to reach a temperature balance.
		Disturbances develop along the fronts and in the jet stream that trigger centers of low and high air pressure.
	www.wxdude.com /page1.html (374 words)

	Meteorology (Weather) Study Guide
		Meteorology is the scientific study of weather and the atmosphere.
		At the location, a "thermometer" measures temperature, a "barometer" measures air pressure, a "sling psychrometer" measures relative humidity, an "anemometer" measures wind speed, and a "wind or weather vane" measures wind direction.
		Air pressure is the force on objects due the weight of the air.
	www.angelfire.com /sc3/bcannon/Meteor.html (596 words)

	Meteorology Terms
		anticyclone: high pressure area with counterclockwise winds in the Southern Hemisphere and clockwise winds in the Northern Hemisphere.
		jet stream: high speed air flow in the atmosphere forming air rivers several hundred miles across that generally move west to east and mark the boundary that separates two global air masses with significant differences in temperature.
		low (low pressure system): area with lower atmospheric pressure than its surrounding areas; this makes air from surrounding areas to flow into the low, the end result of which is probably cloudiness and precipitation.
	www.flowmeterdirectory.com /meteorology_terms.html (1165 words)

	H
		High explosives are used as bursting charges for bombs, projectiles, grenades, mines and for demolition.
		Explosives that are characterized by a very high rate of reaction, high pressure development, and the presence of a detonation wave in the explosive.
		The presumable structure of a hydrogen bomb is as follows: an Atomic Bomb is surrounded by a layer of lithium deuteride (a compound of lithium and deuterium) and then by a tamper, or thick outer layer, frequently of fissionable material, that holds the contents together in order to obtain a larger explosion.
	www.hydrocut.com /Terms/H.html (1761 words)

	Climate & Meteorology-Section I
		The North Pacific high pressure system is the region of high sea-level pressure that occurs over the eastern North Pacific Ocean in the climatological mean as shown in Figure 1 (Mass and Bond 1996).
		This region of high pressure shifts north during the summer and south during the winter and is largely a result of the large-scale subsidence that occurs over the subtropical regions of the world.
		The position of the high pressure offshore in combination with lower pressure in the warm inland areas produces a relatively strong cross-coast pressure gradient, which results in west-northwest to northwesterly winds throughout much of the year (Mass and Bond 1996, Renard 1996).
	bonita.mbnms.nos.noaa.gov /sitechar/clim1.html (968 words)

	"Unnamed" (Site not responding. Last check: 2007-10-25)
		When the pressure remains lower than that of the surroundings, the air which spiraled in toward the center of the low must also have risen and therefore cooled.
		High and low pressure areas are determined in a relative manner.
		Any time the pressure in a certain region is higher than the pressure of the surrounding areas, it is a high pressure area.
	www.mtsu.edu /~cdharris/GEOL100/weather/wthr-sum10.htm (308 words)

	2003 Flight Forecast - It's All About Air Pressure
		The definition of pressure is the force divided by the area.
		Sometimes the air above you is denser, has more molecules per volume, and the pressure is "high." At other times the density of the air is less and the pressure is "low." There is a relationship between the air pressure and the weather (see below).
		As you probably already know, low pressure areas are associated with rain, and high pressure areas are associated with sunny skies.
	www.centennialofflight.gov /2003FF/pressure/index.htm (767 words)

	Meteorology Lesson: Under Pressure
		Pressure is force per unit area, such as pounds per square inch (psi).
		What this means is that pressure is the amount of force, or push or pull, exerted by a material on a given area of another material.
		High pressure usually indicates the weather is fair and dry.
	www.caosclub.org /freelessons/earth26.html (1593 words)

	Mars Penetrator Pressure Sensor
		Absolute measurement of atmospheric pressure is made difficult by the following environmental factors on Mars : The pressure is about 1% of earth atmospheric pressure, and changes by as much as a factor of 3 from day to night.
		This data will illustrate the potential high performance of off-the-shelf piezoresistive pressure sensors which are carefully instrumented and individually-calibrated.
		Pressure sensors will be mounted on the aftbody, where they are subject to deceleration of 100,000g, and environmental temperature variations.
	design.stanford.edu /SMSSL/pressure_sensor/Pressure2.html (691 words)

	Isobars
		Isobars on a synoptic (weather) chart are lines along which the atmospheric pressure is the same.
		A set of curved isobars surrounding an area of low pressure reveals a depression, with the wind in the Northern Hemisphere blowing anticlockwise around its centre.
		A set of curved isobars surrounding a high pressure reveals an anticyclone, with the winds in the Northern Hemisphere blowing clockwise around its centre.
	www.ace.mmu.ac.uk /eae/Weather/Older/Isobars.html (198 words)

	Shrub-Steppe Series: What About Meteorology? (Site not responding. Last check: 2007-10-25)
		The field of meteorology includes both weather and climate and is concerned with the physical, dynamical (a force producing change or motion), and chemical state of the Earth's atmosphere and interactions between the atmosphere and the Earth's surface.
		Air inside a tire or balloon is at high pressure, and air outside of the tire or balloon is at lower pressure.
		Air moves from regions of high pressure to regions of low pressure (though not in a straight line).
	www.pnl.gov /pals/resource_cards/meteorology.stm (1513 words)

	Pressure
		The atmospheric pressure is the pressure in the surrounding air.
		A torr (torr) is named after Torricelli and is the pressure produced by a column of mercury 1 mm high equals to 1/760th of an atmosphere.
		The Normal atmospheric pressure is 14.696 psi, meaning that a column of air on one square inch in area rising from the Earth's atmosphere to space weights 14.696 pounds.
	www.engineeringtoolbox.com /pressure-d_587.html (844 words)

	National Weather Service - NWS Spokane
		Air pressure is the measure of the weight of the air.
		The wind flow in an area of high pressure is clockwise or anticyclonic.
		Areas of high pressure are stable bodies of air which make up many of the characteristic air masses around the world.
	www.wrh.noaa.gov /otx/outreach/ttalk/hilo.php (481 words)

	[No title] (Site not responding. Last check: 2007-10-25)
		] A measure of the strength of the easterly wind between the latitudes of 20° and 35°N; the index is computed from the average sea-level pressure difference between these latitudes and is expressed as the east to west component of the corresponding geostrophic wind in meters and tenths of meters per second.
		] One of the semipermanent highs of the subtropical high-pressure belt; these highs appear as centers of action on mean charts of surface pressure; they lie over oceans and are best developed in the summer season.
		A beet characterized by a white root and cultivated for the high sugar content of the roots.
	www.accessscience.com /Dictionary/S/S62/DictS62.html (2218 words)

	meteorology. The Columbia Encyclopedia, Sixth Edition. 2001-05
		Although most of the discussion is inaccurate in the light of modern understanding, Aristotle’s work was respected as the authority in meteorology for some 2,000 years.
		The invention of the telegraph made possible the rapid collection of nearly simultaneous weather observations for large continental and marine regions, thus providing a view of the large-scale pressure and circulation patterns that determine the weather.
		In 1917 the Norwegian physicist Vilhelm Bjerknes introduced his theory describing the formation of wave cyclones on the polar front and laid the foundation for modern methods of weather forecasting.
	www.bartleby.com /65/me/meteorol.html (623 words)

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