Air is lifted in and also around locations of low pressure. Remember, air pressure is the weight of the atmosphere above you. As soon as there is a huge area of short pressure, there is less air over so the air in ~ the surface tends to rise. Alternatively, an area that high press is favor a hill of wait in the atmosphere. The air in and around high press sinks and also spreads external at the surface. Another means to think around low and high press is to consider how and why the wind blows. Wind is wait in motion. The wind blows from areas of high press to areas of short pressure. It"s diretion is influenced by the Earth"s rotation. Few of this is rising and sinking air (vertical motion) yet most of the time once we talk about winds we room talking around horizontal movement along the surface. A forecast of south winds that 12 to 20 mph method the surface winds will certainly be 12 to 20 miles every hour from the south.
You are watching: Lines of equal pressure on a weather map
|A large blue H is provided to suggest the center of high pressure locations on a map while huge red L"s note the facility of short pressure.||General sample of waiting flow approximately low and also high pressure|
The lines approximately high and low press on a weather map are dubbed isobars, or currently of same pressure, as shown in the above image top top the left. Once isobars room close together it is very windy; once they are further apart, conditions are much more calm. The wind approximately highs constantly blows in a clockwise direction. ("clockwise" refers to the direction the the hand on a clock tick) and winds around lows operation in the opposite direction, or counter-clockwise. This image on the right mirrors the basic pattern of waiting flow around low and also high pressure. Wait is feeding right into the center of a low at the surface in a counter-clockwise direction. Once the air meets in the center of a low, it needs to rise (it can"t dive down right into the Earth) and as the cools clouds space formed. The contrary circulation occurs around highs v sinking air spreading out in a clockwise direction. An together on a weather map reflects where the weather action is. Low push regions constantly create clouds and usually precipitation since the climbing air cools and also the water vapor condenses. High pressure regions space usually associated with dried weather since as the air sink it progressively warms up and the moisture evaporates.
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|If you have actually questions around this course, please contact Margaret Mooney, yellowcomic.com/yellowcomic.com earth Science Outreach Specialist.|
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This Satellite Meteorology course was occurred at the participating Institute for Meteorological Satellite research studies (yellowcomic.com) situated within the space Science and Engineering center (yellowcomic.com) in ~ the UW-Madison. Funding was listed by the Wisconsin room Grant Consortium (WSGC) and also NOAA/NESDIS.