In the field of meteorology, snowfall is known as the phenomenon that causes snow to fall instead of rain. The main cause of the presence of snow as precipitation is the low temperature since it supposes a significant level of cold. However, some other issues are also necessary for the snowfall to occur in a traditional way, the main one having to do with the presence of high humidity, which facilitates the water instead of reaching the surface in a liquid state. Earth, turn into snowflakes. In other words, snow or snowfall occurs mainly when there is a combination of low temperature with high humidity. Other issues such as the wind can also play a role.
Snowfall is obviously a typical feature of cold climates like those found near both poles of the planet. Anyway, the climatic changes of the last years have made that this exclusivity is not such, presenting snowfalls in parts of the planet with temperate climates. For the snow to form effectively, the ambient temperature must be below 0 ° since when this barrier is overcome, the snowflakes that could form melt in the air before touching the surface.
When speaking of snowfall, it refers to the phenomenon that implies the fall of a significant amount of snow, that is, not momentary or circumstantial as can occur with some diffuse rainfall. There are different types of snowfall that, depending on their intensity, range from mild to severe. The latter usually occur especially in spaces not inhabited by humans, for example in forests, mountains, etc. However, in recent times many northern cities have suffered heavier than usual snowfalls, which implies severe complications in transport, communications, etc. In these cases, it is common for security operations to be deployed to keep the streets and routes free of snow, as well as to suspend public activities. Snow can come in various forms depending on its intensity as well; in some cases the precipitation is weak flakes, in others hail and other ice crystals.
