Wireless weather stations are pieces of equipment that include apparatus to record the data required to predict the weather conditions, and a microchip to translate the data and many kinds of display to explain the ensuing weather forecast. The instrument will include thermometers to measure inside and outdoor temperature, a rain gauge to measure rainfall, a barometer to calculate atmospheric pressure, a hygrometer to gauge humidity, an anemometer for wind velocity and wind vanes for wind bearing.

The majority of modern weather stations are wireless instruments, letting you easily put the remote instruments on the outside and have the base unit handily inside. A number include atomic clocks which are calibrated by an atomic clock source regularly to keep them on time, and some show icons telling you if it is necessary to take an umbrella with you or how you need to dress for the day.

To grasp how the the weather forecast is produced you first need to appreciate how the weather is shaped. The land and seas of our world are heated up by the sun to various degrees. It is the difference in temperature at different locations that creates the winds that bring the weather. When the land or ocean is warmed the hot air above it rises, so giving rise to a region of low pressure, as the air becomes cooler it sinks and creates an area of high pressure. As the air climbs it expands and cools, and given that cooler air can hold a smaller amount water than warmer air, the water condenses and forms clouds. When the air descends it shrinks and heats up and can therefore store more water than less warm air. Accordingly an area of low pressure is associated with rain clouds and rain, and high pressure with dry, fair weather. Winds are formed by air flowing from high to low pressure regions, but the result of the rotation of the earth and resistance as the air flows across the surface of the earth force the winds to run around the centres of the low and high pressure zones, instead of straight between them. The strength of the wind is proportional to the discrepancy in air pressure between the low and high pressure zones.

An area of low pressure is called a depression and an area of high pressure an anticyclone. A front is produced where a depression encounters an anticyclone, and is typically linked with cloud and rain as the cooler air causes any water in the warmer air to condense.

So calculating the air pressure, humidity, wind speed and temperature at a specific area over a period of time will let us see whether depressions or anticyclones are happening and if they are crossing an area, giving a means of predicting how the weather will perform in the next few hours and allowing the weather station to tell you if you ought to dress for a warm day or bring an umbrella with you.


Source by Joy Gregory

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