Jon,<br /><br /> <font color="yellow">alto cirrius</font><br /><br />You mean alto stratus? "Alto" in weather terms means the middle atmosphere. Alto clouds such as alto-cumulous or alto-stratus are largely devoid of ice crystals, unlike the Cirrus type found above 15,000 feet depending on Earthly latitude.<br /><br />Jon, what I am talking about is those clouds on both images that are seen at the top of the picture frame, especialy the second picture at the top middle, there's a very rounded and big cloud. There's no mistaking it for a stratus-form cloud. Incidentally, "stratus" means flat-sheet like and "cumulous" is the opposite, being rounded. There also appears to be a distinct boundry between the cloud formations that are rounded and the air that contains the dust is devoid of clouds! In otherwords, there exists something akin to a "frontal zone", or maybe the land where those rounded clouds are is warmer than where the dust is, perhaps due to wind in that area. <br /><br />The clouds shown in your link show something like you describe as being alto-types, but also there is a mixture of cloud types. There also appears to be a circulation going on, especially in one of them.