The weather

Weather, from a meteorological point of view, indicates the set of atmospheric phenomena that take place at a particular moment in a part of the Earth. Some phenomena have a strictly local influence, limited to extremely restricted areas, while others involve entire regions. Atmospheric phenomena are characterized by great variability and small local variations can contribute in making the weather evolve into situations completely different from those foreseen.
Air masses
Air masses, in a meteorological sense, are volumes of atmosphere with uniform temperature, pressure and humidity.
Air masses can be subdivided into six big categories: Arctic air (very cold and very dry), Continental Polar air (cold and dry), Maritime Polar air (cold and humid), Continental tropical air (hot and dry), Maritime tropical air (hot and humid), Equatorial air (hot and very humid).
Perturbations
Perturbations are all climatic and meteorological events that, in some way, disturb the state of equilibrium the atmosphere is in. Since it is a dynamic equilibrium, that varies continuously, it is difficult to establish what exactly a perturbation is when the atmosphere is in a ‘normal’ state, hence the term perturbation today is synonymous with events that bring on bad weather, precipitation or atmospheric events that are in some way unpleasant or threatening for man. In general, from a meteorological point of view, a perturbation is created every time there is interaction between air masses at different temperatures and pressure, even though this does not necessarily mean bad weather and precipitations.

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