What does "the calm before the storm" look like?

As for the weather, literally, it was calm before the storm, because the trend of heavy rain followed the main wind direction. If the east wind was blowing at that time and the air in the west was being sucked into the rainstorm area by the updraft, then the dominant airflow (at this time, the east wind) was superimposed with the sucked "west wind" to form a "calm without wind" in a short time.