A meteorologist spends years of life to study different aspects of the climate and they are pretty much capable of forecasting the weather with different devices. Weather forecasting in true sense is the application of science and technology to forecast the atmospheric state for a given place or area for upcoming time.
Jet streams are the name given to the patterns made by the wind that has blown high up in the Earth’s atmosphere. High and low atmospheric pressure usually influenced by these jet streams. And a complex apparatus is needed to forecast the weather in this ways. Apparatus include satellites, computers, and barometers and so on. But this was not the case in past. When technology was not developed, people had reply on observations. They observed the atmospheric conditions to forecast the weather. One can still forecast weather to some extent with little observant attitude.
Being an amateur you can forecast the weather with the help of some common equipment. What you need to forecast weather includes a thermometer, a windsock or an anemometer, a barometer and a rain gauge. Along with these tools, you need to have a good observing quality to observe the changes in the atmosphere.
Thermometer a common device is often used to measure the temperature of the air. By keeping a record of temperature for the last few days, we can be able to tell whether we are in trend or not. Warm and cool trends are very helpful in forecasting weather. Similarly, rain gauges are used to measure the quantity of rain. It is often believed that heavy rains often can be forerunners of fog. Collecting the measurement about rain is useful in telling the humidity level at the particular location. In case of frozen rain, you can substitute the ruler. A barometer as we all know is used to measure the changes happening in atmospheric pressure. Atmospheric pressure has a great influence on the weather change. It is said that if the pressure is low, then there are chances of rain whereas high pressure represents the calm weather. A windsock or an anemometer is used to measure the direction of the wind. Direction of winds and their strength usually help us to understand the coming weather as, strong winds mean a high pressure, wind blowing towards east may refer to storm or rain and wind blowing west says the opposite.
Besides these tools, the important factor involves in weather forecasting is your ability to observe different things. The better is your observation skill, better will be the chances to predict the coming weather. Movement of clouds, air, appearance of the moon and sky, even observing different animals can give you a hint of coming weather, like birds usually get quiet before it rains.