All weather takes place in the atmosphere, mostly in its very lowest layer.%0D%0A%0D%0AWeather is the condition of the atmosphere in one place for a short period of time. To describe the weather, we look at the general conditions of the sky overhead. Is it clear, cloudy or filled with rain? We also measure six qualities of the atmosphere: precipitation, pressure, humidity, temperature, wind and air quality.%0D%0A%0D%0APressure is the force of the air pushing down upon the Earth. Air pressure is measured with a tool called a barometer, so it is also known as barometric pressure. Low pressure usually brings precipitation, while high pressure often brings dry weather. Humidity is the amount of water vapor in the air compared to how much water vapor the air can hold. Temperature is a measure of heat energy. If the temperature is high, there is more energy and we feel warm. If it's low, there's less energy, so we feel cold. Wind is the direction and speed of the air moving around us. The air quality depends on the place from which it moves: it might be humid, cold, or polluted air.%0D%0A%0D%0AIf you hear a weather report say that a low pressure system is coming in, what kind of weather can you expect?%0D%0A%0D%0AA%0D%0Awind%0D%0A%0D%0AB%0D%0Apolluted air%0D%0A%0D%0AC%0D%0Aprecipitation%0D%0A%0D%0AD%0D%0Aheat