Weather is the day-to-day or hour-to-hour change in the atmosphere. Weather includes wind, lightning, storms, hurricanes, tornadoes, rain, hail, snow, and lots more. Energy from the Sun affects the weather. Climate tells us what kinds of weather usually happen in an area at different times of the year. Changes in weather can affect our mood. We wear different clothes and do different things in different weather conditions. We choose different foods in different seasons, like ice cream in the summer, or hot chocolate in the winter.
Weather stations around the world measure different parts of weather. Ways to measure weather are wind speed, wind direction, temperature, barometric pressure, and humidity. People try to use these measurements to make weather forecasts for the future. These people are scientists that are called meteorologists. They use computers to build large mathematical models to follow weather trends.
Bad weather can hurt people and their property. It can also just be a bother. Some examples of bad weather are:
Causes of weather[change | change source]
Weather happens because different parts of the Earth get different amounts of heat from the Sun. This makes different climates. The tropics get the most heat because the Sun shines straight down on them, while the poles get the least heat because the Sun shines on them from a low angle. Warmer air is lighter than cooler air and rises higher in the sky.
The air always has some water mixed with it. This is called humidity. When it cools, the water can change from a gas to a liquid through condensation. Then the water can fall from the sky as rain or snow. After the air rises, it gets colder and goes back towards the ground. Because the air lost its water before, it is dry when it comes back to the ground. Wind is made when two areas of air of different temperatures meet. This is called an air front. The hot air is forced to rise over the cold causing pressure which forms wind. The ways that the air moves around the Earth are called atmospheric circulation.
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