Why are high pressure systems associated with fair weather?
Similarly, you may ask, why are high pressure systems associated with good weather?
A high-pressure area is where the atmospheric pressure higher with respect to its surroundings. Air descends from the troposphere in its core. The descending air is warmed by compression, causing cloud water vaporize to water vapor thus frequently giving good weather.
Also, why do low pressure systems cause bad weather? When the pressure is low, the air is free to rise into the atmosphere where it cools and condenses. This condensation forms clouds made of water droplets and ice crystals around dust particles in the sky. Eventually the water vapor in the clouds condenses and falls as rain.
One may also ask, what weather is associated with a high pressure system?
A high pressure system is a whirling mass of cool, dry air that generally brings fair weather and light winds. When viewed from above, winds spiral out of a high-pressure center in a clockwise rotation in the Northern Hemisphere. These bring sunny skies. A high pressure system is represented as a big, blue H.
Why do high pressure systems have fewer clouds?
With fewer air molecules above, there is less pressure from the weight of the air above. Winds blow towards the low pressure, and the air rises in the atmosphere where they meet. As the air rises, the water vapor within it condenses forming clouds and often precipitation too.