Why do high pressure areas usually have clear skies?
Wind moves from high pressure to low pressure, the wind brings clouds with it. away from the high pressure areas
High pressure is not essential for clear skies. It certainly helps as high pressure brings with it a general downward movement of air and for clouds to form, a general upward motion of air is needed. However, there are other factors that affect the chance of cloud formation and hence clear skies; the amount of water vapour in the atmosphere, the temperature of the local atmosphere to name just two.
High pressure areas usually cause clear skies and sunny weather. However, low pressure [systems] cause stormy weather, causing precipitation, which may include anything between showers, thunderstorms, or hurricanes. The temperature simply affects the kind of precipitation. Warm temperatures lead to rain, cold temperatures lead to snow, etc.
First answer was incorrect (in this thread).... Here's the breakdown: Regions of sinking air are called highs, high pressure regions or anticyclones. Clear skies and fair weather usually occur in these regions. Regions of rising air are called lows, low pressure regions, depressions or cyclones. Clouds rain and strong winds often occur in these regions.
High pressure zones are created by a phenomenon called subsidence. Subsidence occurs whenever the air in the high cools, becomes denser and moves towards the ground. Pressure increases here because more air fills the space left from the low. Subsidence also evaporates most of the atmosphere's water vapor so high pressure systems are usually associated with clear skies and calm weather.
low air pressure is what causes cloudy skies. Low air pressure causes clouds because usually when there is low air pressure it is humid and it did or still is raining or snowing. The waters evaporates into the sky and forms a cloud (a cloud is mainly water and gases) Once the cloud has too much water in it it would rain, then the cycle would repeat.
For a tornado to form you need large amounts fo cumulus clouds and clear skies above them There is also cloud and it may start to spin forming a tornado?
It is the changing weather. High pressure situations are generally associated with fair, sunny weather. As high pressure is an area of sinking air, and air tends to dry out as it sinks, leaving sunny skies. Low pressure areas are generally cloudy or rainy areas, where strong areas of low pressure bring our stormiest weather. That is because it is an area of rising air, and as air rises, it condenses into clouds and rain…