def plot_barbs(fig, winds, hour):
    """Add barbs to the map figure."""
    u, v, lats, lons = winds[int(hour)]

    ax = fig.get_axes()[0]
    ax.barbs(lons, lats, u, v, length=5,
             sizes=dict(emptybarb=0.25, spacing=0.2, height=0.5),
             linewidth=0.95)
    # ax.quiver(lons, lats, u, v)
    return fig