High and low pressure - Met Office
This causes winds as air moves from zones of high pressure to low pressure. A warm front occurs when a mass of warm air meets a mass of cold air. Air near the surface flows down and away in a high pressure system (left) and air flows the low pressure, and the air rises in the atmosphere where they meet. A low pressure is the result of convergence (air flowing towards it) and a high pressure is occurs in areas of divergence; Air moves from high pressure to low pressure the low pressure, and the air rises in the atmosphere where they meet .
Like a speeding car heading toward a hill, the wind simply powers up the slope. As it rises with the topography, water vapor in the airflow condenses and forms clouds.
The Highs and Lows of Air Pressure | UCAR Center for Science Education
This side of the mountain is called the windward side and typically hosts a great deal of cloud cover and precipitation. The other side of the mountain, the leeward side, is generally less lucky.
The airflow loses much of its moisture in climbing the windward side. Many mountain ranges virtually squeeze incoming winds like a sponge and, as a result, their leeward sides are home to dry wastes and deserts. When a warm air mass and a cold air mass collide, you get a front. Remember how low-pressure warm air rises and cold high-pressure air moves into its place? The same reaction happens here, except the two forces slam into each other.
The cold air forms a wedge underneath the warm air, allowing it to basically ride up into the troposphere on its back and generate rain clouds. There are four main kinds of fronts, classified by airflow momentum. In a warm front, a warm air mass moves into a cold air mass.
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In a cold front, the opposite occurs. Meteorologists study the weather and try to predict it. Predicting the weather is not easy as there are so many factors and variables involved. Different places in the world tend to have different kinds of weather.
Some places, like San Diego, California are warm and sunny for much of the year. While others, like the tropical rain forests, get rain most every day.
The Highs and Lows of Air Pressure
Still others are cold and snowy most of the year, like Alaska. Wind What is Wind? Wind is the result of air moving around in the atmosphere. Wind is caused by differences in air pressure. Cool air is heavier than hot air.
High and low pressure
A lot of cool air will create an area of high pressure. A lot of hot air will create an area of low pressure. When areas of low pressure and high pressure meet, the air will want to move from the high pressure area to the low pressure area. The larger the difference in temperature between the two areas of pressure, the faster the wind will blow.
Wind on the Earth On the Earth there is always an area of low pressure at the poles where the air is always cold.
There is also higher pressure at the equator where the air is hot. These two major areas of air pressure keep the wind constantly moving about the Earth. The spin of the Earth also affects the direction of winds. This is called the Coriolis Effect.
Precipitation rain and snow When water falls from clouds it's called precipitation. This can be rain, snow, sleet, or hail. Rain forms from the water cycle. The sun heats up water on the Earth's surface. Water evaporates into vapor and travels into the atmosphere. As more and more water condenses, clouds form. Eventually water droplets in clouds become large and heavy enough that gravity pulls them back to the ground in the form of rain.
We get snow when the temperature is below freezing and small ice crystals stick together to form snowflakes.Why is high pressure associated with fair, clear skies while low pressure systems are associated wit
Each snow flake is unique making no two snowflakes exactly alike. Hail generally gets formed in large thunderstorms where balls of ice get blown several times up into the cold atmosphere. Each time another layer of water on the ball of ice gets frozen making the ball larger and larger until it finally falls to the ground.
Clouds Clouds are tiny drops of water in the air. They are so small and light that they float in the air. Clouds form from condensed water vapor. This can occur in a number of ways. One way is when warm air or a warm front, meets up with cold air or a cold front. The warm air will be forced upward and into colder air.