Final answer:
Winds around a building are classified as microscale due to their small spatial extent and short time duration, which are affected by individual structures and local topography.
Step-by-step explanation:
The scale of atmospheric motion for winds around a building would be classified as 'microscale', which refers to the smallest scale of atmospheric motions, typically less than one kilometer in horizontal extent. These microscale movements can be affected by individual buildings and topographic features and can result in complex wind patterns that are significantly different from the larger-scale flows above.
The reason why winds around a building are classified as microscale is due to the small spatial extent and short time duration over which they occur. Such winds can encompass variations from turbulent eddies around objects like buildings to the immediate impact of a gust of wind.