1- altostratus - Mid-altitude clouds with a flat sheet-like shape.
2- Areas of cirrocumulus and altocumulus within cirrostratus and altostratus more commonly seen than at a warm front.
3- altostratus clouds do not produce a halo phenomenon nor are the shadows of objects on the ground visible.
4- A further thickening of the altostratus is often accompanied by virga and the arrival of precipitation is imminent.
5- Resulting from thickening altostratus , This is a dark gray cloud layer diffused by falling rain or snow.
6- Sometime virga is seen hanging from altostratus , and at times may even reach the ground causing very light precipitation.
7- However, only two are seen with altostratus and stratus nebulosus whose uniform structures prevent the formation of a perlucidus variety.
8- Altocumulus (Ac), altostratus (As), and Nimbostratus (Ns) are mid-level clouds.
9- An elevated portion of a frontal zone forces broad areas of lift, which form clouds decks such as altostratus or cirrostratus.
10- Often preceded by cirrus, cirrostratus then altostratus like a warm front (but usually with smaller amounts of these clouds).
11- While altostratus and Nimbostratus can extend into the high level of clouds, Nimbostratus can extend into the low level as well.
12- Cumulonimbus and cumulus congestus producing frequent showers, with a sheet of upper altostratus , through which the sun can sometimes be seen.
13- Circle the letter of each sentence that is true about cloud types. a. Cumulus clouds are usually a sign that a storm is approaching. b. Cumulonimbus and nimbostratus clouds produce rain or snow. © Prentice-Hall, Inc. c. altostratus clouds are lower than regular stratus clouds. d. Cirrus clouds are made up of ice crystals.
14- These include middle-étage layers of "altocumulus" and " altostratus " as well as low "stratocumulus", and "stratus".
15- A thickening and lowering of cirrostratus into middle-étage altostratus is a good sign the warm front or low has moved closer and precipitation may begin within less than six hours hours.
16- The best-known is cumulonimbus with mammatus, but the mamma feature is also seen occasionally with cirrus, cirrocumulus, altocumulus, altostratus , and stratocumulus.
17- This normally occurs with altostratus opacus, which can produce widespread but usually light precipitation, and with thicker clouds that show significant vertical development.
18- The variety "undulatus" (having a wavy undulating base) can occur with any clouds of the species stratiformis or lenticularis, and with altostratus .
19- altostratus and nimbostratus clouds always have this physical appearance without significant variation or deviation and, therefore, do not need to be subdivided into species.
20- It normally forms from middle-étage altostratus and achieves vertical extent as it thickens during precipitation with the base subsiding into the low altitude range.
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