
Weather forecast from television
Mankind has always felt the need to be able to predict the weather. As early as 650 BC, people were already looking up at the skies and stars, and recognised certain events which lead to a certain type of weather. Predicting the weather was useful back then mostly for agricultural purposes. Now, it is useful for all sorts of things. People can use it to plan picnics, weddings, the right day to wash the car, and for other various trips which require a certain weather. But forecasting isn’t just used for everyday planning, it is also for warnings of dangerous weather (hurricane, tsunami), by the military to warn officers what the conditions will be during a war, and even now, forecasting is still used for agriculture.
Weather prediction is done now-a-days by specialists with technical equipment, computers, programs, and satellite images. The forecast made by these specialists is spread using the internet, television, radio, and even by word of mouth. There are different techniques available to predict the weather, some more accurate than others. Note that the further the prediction goes, the less accurate the prediction will be, i.e. the prediction for next week is less accurate than the prediction for tomorrow.

A satellite designed to take pictures of the earth to view cloud movement.
1, Persistence: this is when you observe the weather of today to tell the weather of later on. Example, if it is sunny today with no clouds, you can assume it might be sunny tomorrow.
2, Barometer: a barometer is a scientific apparatus that can measure the atmospheric pressure. High pressure in the air indicates the clouds are way up high, meaning they are much lighter, meaning they are not gauged with rain. Low atmospheric pressure means the clouds are very low and almost always ready to let go of their burden, i.e., rain water. The barometer can measure these different types of pressure and it the pressure noticeably keeps rising, it will most probably be nice, but if the pressure drops rapidly, the rain or bad weather is almost always imminent.
3, Sky Watching: the title says it all. Merely observing the sky is a very indication of weather to come. If you notice a great big grey cloud in the distance and there some wind, it is highly possible it will be cold, drizzle, rain, or even a thunderstorm could happen.

Satellite image.
4, Forecast Models: these are models used in meteorology (science of weather) to determine what should happen. There are models for a lot of events. Basically, a model is something saying that if this should happen, then that will follow soon after. These are used by experts in weather forecasting.
5, Analog Technique: this is what could be called ‘pattern recognition’. This means remembering an event from the past, and remembering the signs and other events that lead to it, and applying it to current events. If the signs match up, it can be assumed the big event will happen again. This is useful for hurricanes, tornadoes, etc.
Images from: nº 1, nº2, nº3.
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