What is the wind blowing in autumn?

In autumn, China is controlled by Siberian high and Pacific low, and the wind direction blows from northwest to southeast, blowing northwest wind. Northwest wind is a dry cold wind, blowing from the inland, with little moisture, so it is relatively dry.

There are two main causes of northwest wind in China:

1, the winter wind generated by Mongolia-Siberia high will blow the northwest wind;

2. The westerly wind in the westerly belt is influenced by the geostrophic drift to the right to form the northwest wind (which is also the cause of the northwest wind with latitude of 30-60 degrees in the northern hemisphere), especially the westerly wind from western Europe, which has a great influence on the northwest of China because it is less blocked by the tall terrain. Other northwest winds are basically caused by uneven atmospheric heating and different local air pressure, which has certain contingency.

Extended data:

In autumn, the cold air in the north is constantly invading, but its power is not very strong. Autumn weather often forms in northern China, and continuous autumn rain often appears in West China. The temperature will gradually drop in autumn, but it is generally slower than in winter. Due to the difference of dry and wet conditions, there will be cold and rainy weather conditions or dry and cool weather conditions in different regions.

In the cold late autumn, due to the large temperature difference between day and night, the water vapor transpiration during the day will condense at night, either dew or frost. In autumn, the direct point of the sun gradually moves south from the northern hemisphere, passes through the equator after the autumnal equinox, and the sun directly shines in the southern hemisphere. Seen from the northern hemisphere, the angle of the sun gradually becomes lower, and the gap between day and night becomes smaller. At the autumnal equinox, the length of day and night is equal.