What is the difference between high pressure systems and low pressure systems?

Question

i really need to know for my extra credit but i can't find the answer anywhere !! please, somebody answer, asap.

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Answer 1

This is my idiotic answer, when the weather men say there is a high pressure system in place it wont rain or storm, not much goes on, air is stable

when a low pressure goes in it seems to rain or snow.

that I think is somewhat close to what it means  

Answer 2

High pressure systems are areas of sinking air. The sinking of the air dries the air out, hence, no rain fall. However, low pressure systems are areas of rising air. The rising of the air allows for the cooling and condensation of the air into droplets of water. These droplets of water begin to coalesce and adhere to particles of dust and pollution in the upper atmosphere. Once the droplets become too heavy, they fall back to the earth as precipitation.

Answer 3

High Pressure Systems: These are also known as anticyclones. These rotate clockwise, have upper air convergence, a sinking mechanism, and have surface divergence. Due to the fact they are sinking mechanisms, there is little or no cloud cover. Clear skies are very common features of high pressure systems.

Low Pressure Systems: These are also known as cyclones. These rotate counterclockwise, have upper air divergence, a lifting mechanism, and have surface convergence. Cloudy skies and precipitation are commonly associated with low pressure systems.

Answer 4

All weather systems which develop due to difference in pressure are called pressure systems.If a low pressure system exists over a region,the pressure decreases from the periphery to the centre of that region.The winds blow in an anti-clockwise direction round it in the Northern hemisphere.There will be convergence at the surface level leading to rising of air over the region.Depending upon the pressure gradient,the low pressure area may become a depression or a cyclonic storm.Depressions are in general regions of bad weather with cloud,rain,and strong winds.

A system of closed isobars( in a weather map) enclosing a high pressure,where the pressure increases from the periphery towards the centre,is called a high pressure systrem.Winds blow in a clockwise direction round it (in the Northern hemisphere).The pressure gradient is usually small and hence winds are light.Weather is usually fair in summer but in winter,conditions may be sometimes favourable for radiation fog.Air sinks over a high pressure area  and hence divergence occurs at groud level.

Answer 5

On a weather map, the H's are high pressure systems and the L's are low pressure systems. A high pressure system is region in the atmosphere where the sea level pressure is higher than other areas. High pressure systems rotate clockwise, and produce widespread sinking air and stable, fair weather.

Low pressure systems are areas in the atmosphere of low pressure. They rotate counterclockwise and produce widespread rising air, clouds, and precipitation

Anthony