Different regions have different regional climates. The average weather pattern in a place over several decades is called climate. The chaotic nature of the atmosphere means that it will probably always be impossible to predict the weather more than two weeks ahead however, new technologies combined with more traditional methods are allowing forecasters to develop better and more complete forecasts. Technology, such as weather satellites and Doppler radar, helps the process of looking over a large area, as does the network of weather observations. Knowing where storms are now can help forecasters predict where storms will be tomorrow and the next day. The best forecasts take into account the weather events that are happening over a broad region. Meteorologists develop local or regional weather forecasts including predictions for several days into the future. Remember to bring an umbrella with you on low pressure days because those clouds might cause rain or other types of precipitation. When air pressure is low, air flows together and then upward where it converges, rising, cooling, and forming clouds. The high pressure causes air to flow down and fan out when it gets near the ground, preventing clouds from forming. Typically, when air pressure is high there skies are clear and blue. Air pressure is caused by the weight of the huge numbers of air molecules that make up the atmosphere. The weather events happening in an area are controlled by changes in air pressure. Most weather happens in the troposphere, the part of Earth’s atmosphere that is closest to the ground. Weather is different in different parts of the world and changes over minutes, hours, days and weeks. Weather is the mix of events that happen each day in our atmosphere. Rain and dull clouds, windy blue skies, cold snow, and sticky heat are very different conditions, yet they are all weather. Storm clouds fill the sky above the grassy plains.
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