A high-pressure system usually brings cool temperatures and clear skies. Changes in atmospheric pressure signal shifts in the weather. Atmospheric pressure is the weight of the atmosphere overhead. The coldest weather usually happens near the poles, while the warmest weather usually happens near the Equator. An afternoon at 70 degrees Fahrenheit, for example, would seem cool after several days of 95 degrees Fahrenheit, but it would seem warm after temperatures around 32 degrees Fahrenheit. Almost all scientists measure temperature using the Celsius scale. The United States uses the Fahrenheit system in other parts of the world, Celsius is used. Meteorologists report temperature two ways: in Celsius (C) and Fahrenheit (F). Temperature is measured with a thermometer and refers to how hot or cold the atmosphere is. These changing components, along with the knowledge of atmospheric processes, help meteorologists-scientists who study weather-forecast what the weather will be in the near future. Together, these components describe the weather at any given time. They are temperature, atmospheric pressure, wind, humidity, precipitation, and cloudiness. What Makes Weather There are six main components, or parts, of weather. This “ Green Sahara” experienced frequent rainy weather. However, several thousand years ago, the climate in the Sahara was quite different. Today, the Sahara Desert in northern Africa is the largest desert in the world. However, climate change can take hundreds or even thousands of years. state of Hawaii, is also hot, but much more humid and rainy. state of Nevada is generally dry and hot. For example, the city of Las Vegas in the U.S. The av erage weather in a specific region, as well as its variations and extremes over many years, is called climate. Over many years, certain conditions become familiar weather in an area. It moves, and changes from hour to hour or day to day. For example, a snowstorm around Winnipeg, Manitoba, Canada, might eventually reach Chicago, Illinois, as it moves southeast through the U.S. Weather in your region will eventually affect the weather hundreds or thousands of kilometers away. The same happens with weather around the globe. But weather works like dropping a pebble in water-the ripples eventually affect water far away from where the pebble was dropped. We usually think of weather in terms of the state of the atmosphere in our own part of the world. The term “weather” refers to the temporary conditions of the atmosphere, the layer of air that surrounds the Earth. Severe weather, such as tornadoes, hurricanes, and blizzards, can disrupt many people’s lives because of the destruction they cause. Day-to-day changes in weather can influence how we feel and the way we look at the world. A rainy day might make you think about visiting a museum or staying home to read. If you don’t have school and the weather looks sunny, you might visit the zoo or go on a picnic. Looking outside and listening to the day’s forecast helps you decide what clothes you will wear and maybe even what you will do throughout the day. One of the first things you probably do every morning is look out the window to see what the weather is like.

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