Thunderstorm weather

(1) The solid line in the figure is from Siberia (cold air) to the south, which is a cold wave weather. The dotted line indicates that it landed from the southeast ocean and

(1) The solid line in the figure is from Siberia (cold air) to the south, which is a cold wave weather. The dotted line indicates that it landed from the southeast ocean and was typhoon weather. Judging from the airflow, it is a cyclone (typhoon is the result of tropical cyclone and strong lightning development), which brings heavy precipitation and has a favorable impact on the summer dry weather in the middle and lower reaches of the Yangtze River in China. The Pearl River Delta region is greatly affected by the export of agricultural products and commodity grain bases.

(2) In the upper reaches of the Yangtze River, near 30 north latitude, due to the influence of the west and north of the subtropical high belt, heavy rain formed. This is a mountainous area, which is prone to geological disasters such as mudslides and landslides. The change of one factor will lead to the change of other things, which is the integrity of geographical environment.

(3) China's arid areas are located in the northwest, deep within the mainland, and water vapor is difficult to reach. "Why should a strong enemy complain about the willow? Spring breeze can't pass Yumen Pass" explains Area B. Area C is seriously short of water, so "spring rain is as expensive as oil". D is the Pearl River Delta region, with developed industry, high sulfur dioxide emissions, abundant precipitation and serious acid rain hazards.