Main Meteorological Disasters in Northeast China in July and August and Their Causes

Frozen soil is widely distributed and rivers develop in northeast China. The annual precipitation is 400-800 mm, mainly concentrated in July-August, mostly in semi-humid and semi-arid areas (the eastern and northern mountainous areas of Northeast China are humid areas); It is warm and rainy in summer (short in the northeast) and cold and dry in winter (long in the northeast, cold and snowy, and Mohe is the "cold pole" of China); Main disastrous weather: cold wave in winter, low temperature in summer and early frost in autumn in Northeast China, drought and sandstorm in spring and rainstorm in summer in North China.