Houghton Conquest, Bedford, Central Bedfordshire MK45, United Kingdom of Great Britain and Northern Ireland, Izaña Atmospheric Observatory, Güímar, Tenerife, Spain. This image shows a solitary and dense Cirrus castellanus altocumulogenitus cloud that has developed from Altocumulus castellanus through the glaciation of the whole cloud. The cirrus castellanus clouds look like little turrets or a form of embankment and sometimes have ice crystal trails at the base. Therefore, the common base of the cloud is not quite horizontal, but contains short, virga-like protuberances. Seen from the side, the bright white Cirrus has protuberances in the form of turrets, which are connected by a common base and seem to be arranged in lines. 09 June 2014 1604 (Local Time)Camera direction: towards SE. The bend in the cloud band suggests that a wave might be initiating.

Two aircraft condensation trails are visible at 4 and 5; both are within very high and fine Cirrus and Cirrostratus. 19 July 2010 1247 (Local Time)Camera direction: towards NW. Fairly dense in its presentation, this wall of clouds tends to have rounded ends compared to others of the cirrus genus that have trails. Mouse over the features for more detail. Due to the history of the cloud, it can be assumed that the altitude is unusually low for Cirrus. Links in the image description will highlight features on the image. The sounding was measured four hours before the cloud image was taken and 180 km west-north-west from the location. Cumulonimbus cells are developing to the east of Madrid, Spain in the unstable pre-frontal air mass. As a cloudspotter, it’s easier to spot castellanus clouds in stratocumulus and altocumulus clouds compared to cirrocumulus and cirrus clouds simply because they’re easier to see with the naked eye and perhaps a bit more common. A broad low pressure area covered Spain. It is white in colour, but unlike Altocumulus castellanus, it has no shading or shadows. Instability was enhanced by an approaching trough. The Cumulus at levels of 450–800 m, according to the ceilometer, is mostly ragged Cumulus fractus, but some whitish clouds in the background are more compact and look like Cumulus mediocris. There are signs of the formation of a young wave at the front (see the satellite image). Confusingly, as regards the observed glaciation of the Altocumulus, a ceilometer 30 km north-north-east of the photo location measured the rear edge of a retreating middle-level cloud layer as being at an altitude of 2 900 m, whereas the freezing level in the sounding is at 3 500 m and the favourable temperature for glaciation (–10 °C) is at approximately 5 000 m. The sounding is very dry, indicating the post-frontal air mass. Cirrus castellanus and fibratus. This image shows a solitary and dense Cirrus castellanus altocumulogenitus cloud that has developed from Altocumulus castellanus through the glaciation of the whole cloud. This cloud species is usually dense in formation. Seen from the side, the bright white Cirrus has protuberances in the form of turrets, which are connected by a common base and seem to be arranged in lines.In general, the turrets are taller than they are wide. Cirrus castellanus and Altocumulus. Unstable low levels and conditionally unstable middle levels, with cloud signatures from 507 to 493 hPa and 270 to 201 hPa.
The Cirrus was driven by south-west winds high in the troposphere, where cloud developed in conditions of high relative humidity. In the upper part of the image, Cirrus fibratus is visible. Its name comes from the word castellanus, which means of a fort, of a castle in Latin. This image, taken from about 2 380 m above sea level, shows an example of Cirrus castellanus. This image, taken from about 2 380 m above sea level, shows an example of Cirrus castellanus. Links in the image description will highlight features on the image. Thick large patches of Cirrus spissatus at 1, 2 and 3 that appear to be the remains of the upper parts of Cumulonimbus.

At the top of the main patch of spissatus there is considerable cumuliform development, which is sufficient to reclassify this patch as castellanus. The cloud band of the cold front is dominating in the NOAA-19 image (a combination of channels 1, 2 and 4), taken approximately 15 minutes before the cloud image. Castellanus clouds in the morning indicate stormy weather in the afternoon. Numerous small patches of Atocumulus are present, as are Cumulus humilis cells and several areas of Cirrus. Cirrus castellanus is a species of cirrus cloud. It is located approximately 100 km east-south-east from the image site and is moving further eastwards. The image shows Cirrus with small rounded turrets or crenelations extending from a common base at 1 and 2, which identify it as the species castellanus. Satellite image an hour after the photo was taken. It is generated by the glaciation of the rear edge of the frontal Altocumulus stratiformis translucidus, present at the top of the image and wide in the sky behind and to the side of the observer but not visible in the image. Nimbostratus-type sky prevailed all morning and was followed by a gradually thinning layer of Altocumulus. It appears as separate turrets rising from a lower-level cloud base. Therefore, the common base of the cloud is not quite horizontal, but contains short, virga-like protuberances.

The altitude of middle clouds measured by a ceilometer 30 km north-north-east of the photo location does not match the respective sounding temperatures very well. Indistinct mamma can also be seen hanging from the base of this patch. In general, the turrets are taller than they are wide. Fairly dense Cirrus in the form of small rounded and fibrous turrets or masses rising from a common base, and sometimes having a crenellated (castle battlement) appearance. Mouse over the features for more detail. However, there was no Cumulonimbus development over England or Wales, UK on this day. To the west of Madrid can be seen middle- and high-level cloud on the trough line. A thin layer of Cirrus fibratus is present closer to the observer.

Clouds in the image represent the rear edge of a slowly moving cold anafront. The cloud image location is approximately in the middle of the satellite image, at the rear of the frontal band. Often these cloud turrets form in lines, and they can be taller than they are wide.
Like all cirrus, this species occurs at high altitudes. At the bottom of the image, a veil of Cirrostratus nebulosus is visible, with no distinct detail.