Read the schematic diagram of the change of wind direction and wind speed with time when a weather system passes through the northern hemisphere (as shown in the figure), (the arrow symbol in the figu

Read the schematic diagram of the change of wind direction and wind speed with time when a weather system passes through the northern hemisphere (as shown in the figure), (the arrow symbol in the figure indicates the wind direction; Wind speed and wind grade Symbols in the picture? Represents the wind direction, and this legend represents the north wind. When the weather system crosses the border at 22: 00, northwest wind prevails before the weather system crosses the border, southeast wind prevails after the weather system crosses the border, and the wind direction changes from northwest wind to southeast wind, so it can be judged that the moving direction of the weather system is from southeast to northwest.

So choose: C.