The wind direction mentioned in the weather forecast refers to how high the wind direction is, isn't it convection? For example, below 3000 meters, there will be several winds on each floor.

In meteorology, the direction of (horizontal) wind is determined as the wind direction. One of the instruments for measuring the wind direction is the wind vane, which is generally10-12m above the ground. If there is an obstacle nearby, its height should be at least 6 meters higher than the obstacle.

The wind direction mentioned in the weather forecast refers to the wind direction with the height of the wind vane (10- 12m).

Meteorological observation data include: sea level (10m wind), 900 hectopascals (1000m), 850 hectopascals (1500m), 700 hectopascals (3,000m), 500 hectopascals and 300 hectopascals. ...