Figure 2. OLLJ-3D mean structure during January 2014, showing wind speed stream tubes of 9 m s-1 (cyan), 12 m s-1 (magenta) and 14 m s-1 (yellow) [instead of 8 m s-1, a threshold of 9 m s-1 is used to improve clarity]. Interactions with surrounding topography produce localized cores of higher wind speeds (C1–C4). Lowland wind vectors at 500 m AGL are displayed in red.