A fast cold or hot front moving in, an unexpected flow from the ocean or a cold wind may change the whole days forecast. .
There are many different materials and devices used by local and government services to predict the weather. Some of these devices are, radars, which is actually sound waves, which bounce off clouds and give location of storms this way. .
Another such device is actually a variation of radar called "Doppler Radar". The "Doppler" actually can give the exact location of a storm within a kilometer. However, "Doppler Radar" is not used so much for everyday forecasting, but for tornadoes and very large storms. The way Doppler Radar works is almost the same as regular radar with one advantage, it also can measure the speed of an object or storm, which makes its prime usage tornado watching. .
Some other techniques have been adapted to forecast the weather such as infrared beams, which even at night can show where the intensity of a storm is. And of course there are other instruments used to predict the weather such as the barometer and the thermometer.
Of course all of these inventions have proven helpful for forecasting weather, there was still one problem. The main problem was communicating. The reason for this was that if the forecasters were to send letters to each other every time there was a storm, their counterparts would not learn of a storm or tornado for days! The solution to this problem began with the invention of the telegraph. .
The telegraph provided a simultaneous message carrier to anywhere in the country. Later the radio was invented and then that was used, but still something else was needed a system to transport footage as well as sound. The Internet solved the solution to that. The Internet is a connection by phone lines, which can deliver photos and sound instantaneously. .
The next breakthrough in forecasting was the satellite. A satellite would be launched from Earth and then would take video and photos of the world and send back to Earth the footage, thereby being able to show storms coming from the ocean just at the first stages.
