Process of forest fire caused by lightning strike

 

The main causes of forest fires caused by lightning strikes are thunderstorms, especially dry thunderstorms, less precipitation, increased ground temperature, reduced relative humidity, and dry combustibles. Once a lightning strike occurs, it is easy to catch fire and spread into disasters.

 

A dry thunderstorm is a special weather condition, due to the hot and dry weather, and the clouds of the upper air encounter cold air and rain. But the rain has not yet fallen to the ground. Due to the high temperature of the lower surface, the rain is immediately evaporated into humid hot air and rises into the air again. Thunder and lightning will occur when it rains, accompanied by strong wind! It is easy to cause a forest fire.

 

Lightning is often accompanied by strong precipitation. If the rainfall and rain intensity reach a certain level, the fire source caused by the lightning strike will automatically extinguish, and no forest fire will occur. However, under warm and dry weather conditions, precipitation cannot reach the ground, or only a small amount of rain reaches the ground, and the rainfall is too small to extinguish the fire source. At this time, the fire source caused by the lightning strike will spread into disaster.

 

The possibility of fire caused by lightning strikes is related to the meteorological conditions (such as temperature, temperature, wind speed, etc.) and vegetation conditions (flammable distribution, size, and moisture content, etc.) where the lightning occurs. If there is precipitation when the lightning occurs or after the lightning, the possibility of fire spreading also has an important relationship with the amount of rain and the intensity of the rain.

 

Lightning caused forest fires are seasonal in certain areas. For example, the forest area of ​​Daxinganling is mostly from mid-April to mid-July. In the area south of Yichun from late May to early June, the lightning strike fire occurred most in the northern area of ​​Shanbei in late June. It is usually more in the afternoon in the day and less in the morning. The higher the latitude, the more lightning strikes occur. Lightning strikes in forest areas in southern China are far less than in northern forest areas.

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July. 13, 2020