photo #9149860

Christine Foran (Member 58,407) tells us her friend Bruce is always looking at clouds and happened across these. He spotted them over Stokers Siding, New South Wales, Australia. They are a swathe of Altocumulus stratiformis perlucidus clouds curving across the blue, with flecks of Cirrus lurking alongside. Such a distinct cloud edge as this reveals very different air masses coming into contact with each other – usually as drier, sinking air nudges away a layer of moister air in which the Altocumulus clouds have formed. This is a sky divided as the cool quilt of cloud draws aside.