Material 1: The Central Meteorological Observatory reported in 20081October 20th 10 that the strongest cold air that has affected China since autumn has brought great influence to the northwest of Chi

Material 1: The Central Meteorological Observatory reported in 20081October 20th 10 that the strongest cold air that has affected China since autumn has brought great influence to the northwest of China. Exploration 1: According to the material 1, this strong cold air activity is a fast-moving cold front, controlled by a warm air mass before crossing the border, with clear weather, high temperature and low pressure; When the cold front crosses the border, it will produce strong wind, cooling, freezing injury, rain and snow and other weather; After the cold front crossed the border, controlled by the cold air mass, the weather turned fine, the temperature dropped and the air pressure rose.

Question2: As can be seen from the figure, at this time, the areas where the cold front is active in China are Xinjiang and Northeast China, and the cold front will bring precipitation, and the precipitation is mainly concentrated near and behind the front. At the same time, the picture also shows that it is raining in Sichuan Basin, southern Shaanxi and Hainan Island.

Exploration 3: As shown in the figure, there is a low pressure (cyclone) system in Hainan Island. The airflow around the cyclone converges counterclockwise to the center, and the central airflow is rising, so it will bring rainy weather. The figure shows that the isobar in the west of Hainan Island is denser than that in the east. The denser the isobar, the greater the pressure gradient and the greater the wind speed, so the wind speed in the west of the cyclone is greater than that in the east of the cyclone.