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森林火灾的发生和蔓延,除与森林种类、林木疏密程度、树木年龄等条件有关外,还与气象条件有着密切关系。大家知道,森林中各种可燃物的着火点是不同的,它决定于可燃物含水量的多少。而含水量的多少则取决于气象条件的变化情况,如湿度的大小、气温的高低、降雨量的多少、风力的强弱等。一般认为,晴天、高温、大风天气,常使森林中可燃物的含水量下降到40％以下,这时最易发生森林火灾。在诸种气象条件中,空气湿度是火险天气
The occurrence and spread of forest fires are closely related to the meteorological conditions besides the conditions of forest types, density of trees and tree age. As we all know, the ignition point of various combustibles in the forest is different, and it depends on the amount of combustible water content. The amount of water content depends on changes in weather conditions, such as the size of the humidity, the temperature level, the amount of rainfall, the strength of the wind and so on. Generally believed that the sunny, hot, windy weather, often make the forest water content of combustibles down to 40% or less, when the most vulnerable to forest fires. In various weather conditions, the air humidity is dangerous weather