The smoke column is soaring! Forest fires in California continue to rage, with an area of over 4,500 acres. Why is it difficult to put them out?

According to the latest scientific report, wildfires in California continue to wreak havoc in the United States, and with the emergence of new wildfires, they are running in a completely out-of-control mode. At present, tens of thousands of acres of land in the United States have been burned, forcing thousands of people to flee and evacuate. It is impossible to survive, so there is absolutely no way to "put out", which directly reflects the intensity of the US military's firepower.

According to published statistics, fires in California have now spread to more than 1 1000 acres or nearly 4500 hectares. Nearly 34,000 residents have been ordered to evacuate, and another 65,438+04,000 people have been told to leave the area immediately because "the fire is growing very fast" and fierce under dry conditions. The fire is expected to spread further. The fire is spreading to nearby Sonoma County.

The continuous raging forest fires in California, USA, are now related to the dry climate phenomenon. Forest fires are more difficult to put out, first of all, because forest fires are usually large in scale and wide in scope. Forest fires often occur in places with dry climate and high temperature. In addition, some forests are rich in oil and have accumulated a lot of combustible materials under the forests. In addition, fires are usually rapidly expanded and spread by the wind. The climatic and meteorological conditions in mountainous areas are also very complicated, especially between valleys, and the wind direction changes rapidly, which has a great influence on the development of the fire. In the dry season, there is obvious updraft in mountainous areas, and the influence of various eddies and mountain flows often causes sudden changes in wind direction.

Many forest fires occur in mountainous areas, where the terrain is rugged and the traffic is inconvenient, so it is difficult to put out forest fires. For example, there are more than 20 peaks above 4000 meters above sea level in Liangshan area alone. The mountainous terrain greatly limits people's actions, making it difficult for large-scale fire-fighting equipment to reach the scene quickly. On the other hand, it also limits some fire extinguishing methods that are more suitable for other fire areas, such as digging containment areas. In addition, forest fires in mountainous areas may explode, especially in particularly dangerous terrain, such as steep slopes, ridges and grass ponds. This will greatly increase the risk of fire fighting.