Timpelapse phototgraphy. A pic snapped every 10 seconds over many hours, shows a cold front approaching Cape Town. With blue skies, a fain dark line approaches and appears to increase in apparent altitude. First, some orographic cloud starts streaming off Table Mountain. After a while, Lion's Head starts triggering an impressive Banner Cloud. Eventually the entire area starts over-developing. Next morning, the wind has backed from the typical pre-frontal NW to W and continues backing towards post-frontal SW as the weather improves once again.