High And Low Pressure Flashcards, test questions and answers

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What is High And Low Pressure?

High and low pressure weather systems are an important part of understanding global weather patterns and predicting future climate. High pressure, or anticyclonic, systems usually bring fair weather and tend to be associated with clear skies, light winds, and warm temperatures. Low pressure, also known as cyclonic, systems often bring wetter conditions such as rain or snow.High pressure is created when air rises from the ground due to warming from the sun. The rising air cools since it is expanding at higher altitudes which leads to a decrease in air density. This causes a decrease in surface air pressure which creates an area of high pressure because of the reduced amount of available space for air molecules in the atmosphere. Anticyclones form when two high-pressure areas move towards each other and then away again creating a circular pattern that can be seen on a weather map as a large circle with arrows pointing towards each other inside it (a clockwise pattern in the northern hemisphere).Low-pressure systems form when warm air rises from the ground due to being warmed by the sun’s energy causing an increase in atmospheric density leading to an area of low pressure at surface level. Cyclones form when two low-pressure areas move towards each other creating a circular pattern that can be seen on a weather map by looking for arrows pointing away from each other (a counterclockwise pattern in the northern hemisphere). Low-pressure systems are usually associated with cloudy skies, strong winds, and cooler temperatures than those found within high-pressure areas. In summary, high and low pressure weather systems play an integral role in global climate patterns by influencing temperature differences between different regions around the world as well as providing precipitation for many areas throughout year round.