Figure 11. Diurnal cycle of (a) wind direction (red, degN), wind speed (dashed, m s-1), zonal wind speed (green, m s-1), meridional wind speed (cyan, m s-1), and (b) surface pressure (yellow, hPa), potential temperature (black, K), and mixing ratio content (blue, g kg-1), from November 2013–March 2014, at a selected surface location (7.5ºN– 69.7ºW; Las Mulas, Apure-Venezuela) along the axis of propagation K (Fig. 5). The zonal and meridional wind speeds are negative (easterly and northerly components, respectively).