A low pressure area, or "low", is a region where the atmospheric pressure Atmospheric pressure is defined as the force per unit area exerted against a surface by the weight of air above that surface at any given point in the Earth's atmosphere. In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. Low pressure areas have at sea level Mean sea level is a measure of the average height of the ocean's surface (such as the halfway point between between the mean high tide and the mean low tide); used as a standard in reckoning land elevation is lower in relation to surrounding locations. Low pressure systems form under areas of wind divergence which occur in upper levels of the troposphere The troposphere is the lowest portion of Earth's atmosphere. It contains approximately 75% of the atmosphere's mass and 99% of its water vapor and aerosols. The name for the process concerning the formation of low pressure areas is known as cyclogenesis. Within the field of atmospheric dynamics Meteorology is the interdisciplinary scientific study of the atmosphere that focuses on weather processes and forecasting . Studies in the field stretch back millennia, though significant progress in meteorology did not occur until the eighteenth century. The nineteenth century saw breakthroughs occur after observing networks developed across, these areas of wind divergence aloft are either on the east side of upper troughs which form half of a Rossby wave Rossby waves are giant meanders in high-altitude winds that are a major influence on weather. Their emergence is due to shear in rotating fluids, so that the Coriolis force changes along the sheared coordinate. In planetary atmospheres, they are due to the variation in the Coriolis effect with latitude. The waves were first identified in the Earth' within the Westerlies The Westerlies or the Prevailing Westerlies are the prevailing winds in the middle latitudes between 35 and 65 degrees latitude, blowing from the high pressure area in the horse latitudes towards the poles. These prevailing winds blow from the west to the east, and steer extratropical cyclones in this general manner. Tropical cyclones which cross (a trough with large wavelength In physics, the wavelength of a sinusoidal wave is the spatial period of the wave – the distance over which the wave's shape repeats. It is usually determined by considering the distance between consecutive corresponding points of the same phase, such as crests, troughs, or zero crossings, and is a characteristic of both traveling waves and which extends through the troposphere), or ahead of embedded shortwave troughs A shortwave or shortwave trough is an embedded kink in the trough / ridge pattern. This is the opposite of longwaves, which are responsible for synoptic scale systems, although shortwaves may be contained within or found ahead of longwaves and range from the mesocale to the the synoptic scale. Shortwaves are most frequently caused by either a cold which are of smaller wavelength. Diverging winds aloft ahead of these troughs cause atmospheric An atmosphere is a layer of gases that may surround a material body of sufficient mass, by the gravity of the body, and are retained for a longer duration if gravity is high and the atmosphere's temperature is low. Some planets consist mainly of various gases, but only their outer layer is their atmosphere (see gas giants) lift within the troposphere below, which lowers surface pressures as upward motion partially counteracts the force of gravity Gravitation, or gravity, is a natural phenomenon by which objects with mass attract one another. In everyday life, gravitation is most familiar as the agent that lends weight to objects with mass and causes them to fall to the ground when dropped. Gravitation causes dispersed matter to coalesce, thus accounting for the existence of the Earth, the.
Low pressure systems which form due to localized heating caused by greater sunshine over deserts and other land masses are called thermal lows Thermal lows are non-frontal low-pressure areas that occur over the continents in the subtropics such as near the Sonoran Desert, the Mexican plateau, Sahara, South America over northwest Argentina, Australia, the Iberian peninsula, and Tibetan plateau during the warm season as the result of intense heating when compared to their surrounding. Since localized areas of warm air are less dense than their surroundings, this warmer air rises which lowers atmospheric pressure near that portion of the Earth Earth is the third planet from the Sun, and the fifth-largest of the eight planets in the Solar System. It is also the largest, most massive, and densest of the Solar System's four terrestrial (or rocky) planets. It is sometimes referred to as the World, the Blue Planet,[note 3] or Terra.[note 4]'s surface. Large-scale thermal lows over continents A continent is one of several large landmasses on Earth. In geography, they are identified by convention rather than any strict criterion, with seven regions commonly regarded as continents—they are : Asia, Africa, North America, South America, Antarctica, Europe, and Australia help drive monsoon A monsoon is traditionally defined as a seasonal reversing wind accompanied by seasonal changes in precipitation, but is now used to describe seasonal changes in atmospheric circulation and precipitation. The major monsoon systems of the world consist of the West-African and Asia-Australian monsoons. The inclusion of the North and South American circulations. Low pressure areas can also form due to organized thunderstorm activity over warm water. When such an occurrence occurs over the tropics in concert with the Intertropical Convergence Zone The ITCZ was originally identified from the 1920s to the 1940s as the "Intertropical Front" , but after the recognition in the 1940s and 1950s of the significance of wind field convergence in tropical weather production, the term "ITCZ" was then applied, it is known as a monsoon trough The monsoon trough is that portion of the Intertropical Convergence Zone which extends into or through a monsoon circulation, as depicted by a line on a weather map showing the locations of minimum sea level pressure, and as such, is a convergence zone between the wind patterns of the southern and northern hemispheres. Westerly monsoon winds lie. Monsoon troughs reach their northerly extent in August and their southerly extent in February. When a convective low acquires a well-defined circulation in the tropics it is termed a tropical cyclone A tropical cyclone is a storm system characterized by a large low-pressure center and numerous thunderstorms that produce strong winds and heavy rain. Tropical cyclones feed on heat released when moist air rises, resulting in condensation of water vapor contained in the moist air. They are fueled by a different heat mechanism than other cyclonic. Tropical cyclones can form during any month of the year globally, but can occur in either the northern and southern hemisphere during November.
Atmospheric lift will also generally produce cloud cover Cloud cover refers to the fraction of the sky obscured by clouds when observed from a particular location through adiabatic The lapse rate is defined as the negative of the rate of change in an atmospheric variable, usually temperature, with height in an atmosphere. While typically applied to Earth's atmosphere, the concept can be extended to any gravitationally supported ball of gas cooling, once the air becomes saturated as it rises. Thus, low pressure areas typically bring cloudy skies, which act to minimize diurnal temperature extremes Diurnal temperature variation is a meteorological term that relates to the variation in temperature that occurs from the highs of the day to the cool of nights. Since clouds reflect sunlight Sunlight, in the broad sense, is the total frequency spectrum of electromagnetic radiation given off by the Sun. On Earth, sunlight is filtered through the Earth's atmosphere, and solar radiation is obvious as daylight when the Sun is above the horizon, incoming shortwave Shortwave radiation is a term used to describe the radiant energy in the visible (VIS), near-ultraviolet (UV), and near-infrared (NIR) wavelengths. The wavelength range is not always exactly defined, as there is no standard cut-off for the NIR. Shortwave radiation may be as broadly defined as between 0.1 and 5.0 micrometers) or as narrow as 0.2 to solar radiation Sunlight, in the broad sense, is the total frequency spectrum of electromagnetic radiation given off by the Sun. On Earth, sunlight is filtered through the Earth's atmosphere, and solar radiation is obvious as daylight when the Sun is above the horizon is less which causes lower temperatures There are basically two equivalent concepts of temperature, the thermodynamic concept and the statistical physics concept. Since thermodynamics deals entirely with macroscopic measurements, the thermodynamic definition of temperature, first stated by Lord Kelvin, is stated entirely in macroscopically measurable variables. Statistical physics during the day. At night, the absorptive effect of clouds on outgoing longwave radiation Outgoing Longwave Radiation is the energy leaving the earth as infrared radiation at low energy. Earth's radiation balance is very closely achieved since the OLR very nearly equals the Shortwave Absorbed Radiation received at high energy from the sun. Thus, the First Law of Thermodynamics (energy conservation) is satisfied and the Earth's average, such as heat energy from the surface, allows for warmer diurnal low temperatures in all seasons. The stronger the area of low pressure, the stronger the winds Wind is the flow of gases on a large scale. On Earth, wind consists of the bulk movement of air. In outer space, solar wind is the movement of gases or charged particles from the sun through space, while planetary wind is the outgassing of light chemical elements from a planet's atmosphere into space. Winds are commonly classified by their spatial which are experienced in its vicinity. Globally, low pressure systems are most frequently located over the Tibetan Plateau The Tibetan Plateau , also known as the Qinghai-Tibetan Plateau (Chinese: 青藏高原; Pinyin: Qingzang Gaoyuan) is a vast, elevated plateau in Central Asia covering most of the Tibet Autonomous Region and Qinghai Province in China and Ladakh in Kashmir, India. It occupies an area of around 1,000 by 2,500 kilometers, and has an average elevation and in the lee of the Rocky mountains The Rocky Mountains are a major mountain range in western North America. The Rocky Mountains stretch more than 4,800 kilometres (2,980 mi) from the northernmost part of British Columbia, in Canada, to New Mexico, in the United States. The range's highest peak is Mount Elbert in Colorado at 14,440 feet (4,401 m) above sea level. Though part of. In Europe (particularly in the United Kingdom The United Kingdom of Great Britain and Northern Ireland[note 7] is a sovereign state located off the northwestern coast of continental Europe. It is an island country, spanning an archipelago including Great Britain, the northeastern part of Ireland, and many small islands. Northern Ireland is the only part of the UK with a land border, sharing), recurring low pressure weather systems are typically known as depressions.
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Elsewhere, a low pressure system will move northeastward up Japan, bringing moderate to heavy rain to the country. Temperatures in Tokyo and Seoul will hit ...
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The . system. reports . low pressure. just as precisely for one individual tire as for all four tires. The sensor technology can even detect a minimal 70 mbar change in . pressure. . When . pressure. is constant, the current value is sent to the ...
Q. Pros and cons of a low pressure system in paintball?
Asked by Henry C - Fri Aug 3 16:58:44 2007 - - 2 Answers - 0 Comments
A. Advantages- There's a large number of unproved theories concerning accuracy and range, there are several actual, quantifiable effects from converting a blow-back semi-automatic paintball gun to LP operation. Whether or not these are considered real advantages depends on what you're wishing to achieve. The most obvious effect of LP operations is reduced noise signature. LP guns use less pressure to propel the ball, and a lower pressure means a lower audible "pop" sound when gas is released from the valve. Due to the nature of Co2, people who use that propellant will see biggest advantages from LP, such as improved cold weather performance. Co2 pressure fluctuates with temperature, and in cold weather, tank output pressure can drop below… [cont.]
Answered by Just keep breathin' - Fri Aug 3 17:57:52 2007
