Can anone define high and low pressure systems.?

Question

-What symbols are used to denote each
-With respect to atmosphere, what causes each to form
-What is the resuulting weather of each system

Thanks I really can`t get this, I sux at ahem.

Answer 1

A pressure system is a region of the Earth's atmosphere where air pressure is unusually high or low. High and low pressures develop (and dissipate) constantly due to thermodynamic interactions of temperature differentials in the atmosphere and water in oceans, lakes, and other bodies of water.

Pressure systems on weather maps:
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On weather maps, which often display weather fronts and pressure systems graphically, low-pressure systems are depicted with a capital L, unless they are tropical storms or tropical cyclones (in which case the symbols for those weather systems are used). High-pressure systems are depicted with an H. The steepness of the pressure gradient can be observed according to the density of isobars, or lines on the map at which pressure is equal.

Low pressure system:
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The components of storms are attracted to regions of low pressure. For this reason, heavy precipitation and overcast conditions are often associated with low-pressure systems. Due to the Coriolis effect, low-pressure systems often develop cyclonic properties: in the northern hemisphere, winds around the system move counterclockwise, and in the southern hemisphere they move clockwise. Low pressure systems, additionally, often become junctures of fronts.

Most of history's most powerful storms, such as the 1993 North American storm complex and all tropical cyclones, have been low-pressure cyclonic systems. Tornadoes invariantly have very strong local low-pressure systems at their vortices.

The lowest recorded non-tornadic barometric pressure was 869.96 millibars (25.69 inches of mercury), occurred in the Western Pacific during Typhoon Tip on 12 October 1979.

High-pressure system:
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High pressure systems are associated with clear, cool weather. Around high-pressure systems, winds flow clockwise in the northern hemisphere, counterclockwise in the southern hemisphere.

In the northern winter, high-pressure systems (called Canadian highs or Arctic air masses) often migrate to midlatitude regions such as the North American upper Midwest, New England, and northern Europe. These create cold snaps where unseasonably cold and sunny weather are observed. Cold snaps often follow winter warm spells, where temperatures may be as high as 10°C to 20°C (50-68 °F), and often happen suddenly. The most dramatic Arctic cold snaps, observed in the central regions of North America involve temperature drops of 25°C (45°F) or more in a few hours.

Arctic highs, alone, rarely trigger precipitation because of the cloudless weather they produce. However, in combination with other weather-making systems, the cold air they bring can produce massive snowstorms.

High pressure usually means good weather.

Answer 2

Low Pressure System Definition

Answer 3

Low Pressure Definition

Answer 4

A good way to physically picture a high pressure system is to take a bowl and turn it over on the table. Let it represent a dome of cold air. The surrounding air is relatively warmer. The leading edge of the bowl represents a cold front. It is also where the atmospheric pressure is the lowest. Low pressure centers form as waves along the surface of the high. Envision a wave along the surface of the bowl. Under the center of the Bowl is where the Atmospheric pressure is the greatest and is identified by an H. The low along the front is identified by an L.

Where the low is located is where winds are converging inward near the surface toward the center of the low. As they do so they rise and form clouds and rain or snow.

Where the high is located is where winds are diverging outward from the high near the surface and so the winds aloft are sinking. This sinking in a high supresses clouds and rain.

Bottom line. High pressure areas are generally calm and clear while low pressure centers are windy and cloudy with rain.

Answer 5

High Pressure is where the air is sinking faster so exherting more pressure on the ground.

Low Pressure is where the air is sinking slower or rising slowly hence pressure is low

This is denoted by Isobars (similar to contours but show pressure rather than height)

Pressure is related to temperature, and so temperature governs the pressure. Higher pressure is usually caused when the air cools over oceans and begins to sink. Low pressure is caused when it warms up.

Mixing weather systems seen as fronts (little blue semicircles and red triangles for cold and hot fronts respectively). These cause the major cloud movements and winds. The greater the difference, the worse the weather becomes.

Answer 6

Low pressure is a region where the pressure decreases from the periphery to the centre.The winds blow in an anti-clockwise direction(N.W.)
The letter 'L' is used to denote low pressure system in weather maps.
Due to the unequal heating of the earth's surface by the solar radiation,some place are heated more than the sorroundings.The air over that place becomes warmer and rises and becomes clouds(if enough moisture is there) after condensation at higher levels.As the warm air is lighter than cold air,the weight of the air coloumn(which is the pressure at that place) over that pace becomes less and it becomes a low pressure area.
As above said,the warm air rises and clouds form.So,low pressure areas are usually regions of bad weather with cloud ,rain and strong winds.
In high pressure areas,the pressure increases towards the centre from the periphery.As these areas are heated less compared to low pressure areas,the air is comparatively colder and hence the weight of the air column above it(which is the pressure over that place) is comparatively more and it becomes a high pressure area.Winds ,within this area blows clockwise(N.H).As the pressure gradient is comparatively less, the wind is lighter.
High pressure areas are denoted by the letter'H'.
As the air sinks over a high pressure area,the weather is usually fair in summer.In winter radiation fog is possible which may sometimes lift and form low clouds creating 'anticyclonic gloom' as high pressure areas are sometimes called anticyclone.

Answer 7

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RE:
Can anone define high and low pressure systems.?
-What symbols are used to denote each
-With respect to atmosphere, what causes each to form
-What is the resuulting weather of each system

Thanks I really can`t get this, I sux at ahem.

Answer 8

anone define high pressure systems