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How Can We Measure the Weather? center doc

geography and weather differences


How Can We Measure The Weather? Weather is... the day to day condition of the air around us over a short period of time. Temperature • Temperature means how hot or cold it is • It is usually measured with a thermometer in degrees centigrade(ºC) Pressure • Pressure is a measure of how heavy the air is. • Pressure is measured with a barometer in millibars (mb) Cloud Cover • Cloud Cover tells us how much of the sky is covered by clouds. • It is measured by estimating the amount of cloud cover in eighths. Wind Speed • Wind speed is how fast the wind is blowing. • An anemometer measures wind speed in mph. • The most common type looks like a toy windmill. Three cups are fixed to a central shaft and the stronger the wind blows the faster they spin around. The wind speed is shown on a dial, just like a car's speedometer Wind Direction • Wind direction is where the wind is blowing from. • Wind Vane/Wind Sock: measures wind direction by pointing towards North, East, South or West Rainfall/Precipitation • Precipitation is water falling from the sky. • Rain gauge: measures the amount of rainfall in mm. Not only does a rain gauge measure rainfall, but also all other forms of precipitation. Sunshine • Sunshine is light and warmth from the sun. • A Campbell Stokes Recorder measures sunshine. • This type of recorder is made up of a glass ball which concentrates sunshine on to a thick piece of card. The sunshine then burns a mark on the card which shows the number of hours of sunshine in the day. Visibility • Visibility is how far ahead we can see. • It is measured using a tape measure or trundle wheel, in metres or kilometres.
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4/27/2008
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