Clouds


Code Symbol Type
L1 cumulus humilis
cumulus fractus 		little vertical extent and seemingly flattened, or ragged cumulus other than of bad weather, or both
L2 cumulus mediocris
cumulus congestus 		cumulus of moderate or strong vertical extent, generally with protuberances in the form of domes or towers, either accompanied or not by other cumulus or by stratocumulus, all having their bases at the same level
L3 cumulonimbus calvus cumulonimbus the summits of which, at least partially, lack sharp outlines, but are neither clearly fibrous (cirriform) nor in the form of an anvil; cumulus, stratocumulus or stratus may also be present
L4 stratocumulus cumulogenitus stratocumulus formed by the spreading out of cumulus, cumulus may also be present
L5 stratocumulus
other than stratocumulus cumulogenitus 		stratocumulus not resulting from the spreading out of cumulus
L6 stratus nebulosus
stratus fractus 		stratus in a more or less continuous sheet or layer, or in ragged shreds, or both, but no stratus fractus of bad weather
L7 stratus fractus
of bad weather
cumulus fractus
of bad weather 		stratus fractus of bad weather or cumulus fractus of bad weather, or both (pannus), usually below altostratus or nimbostratus
L8 cumulus and stratocumulus cumulus and stratocumulus other than that formed from the spreading out of cumulus, the base of the cumulus is at a different level from that of the stratocumulus
L9 cumulonimbus capillatus cumulonimbus, the upper part of which is clearly fibrous (cirriform), often in the form of an anvil, either accompanied or not by cumulonimbus without anvil or fibrous upper part, by cumulus, stratocumulus, stratus or pannus

Code Symbol Type
M1 altostratus translucidus altostratus, the greater part of which is semi-transparent, through this part the sun or moon may be weakly visible, as through ground glass
M2 altostratus opacus
altostratus nimbostratus 		altostratus, the greater part of which is sufficiently dense to hide the sun or moon, or nimbostratus
M3 altocumulus translucidus
at a single level 		altocumulus, the greater part of which is semi-transparent, the various elements of the cloud change only slowly and are all at a single level
M4 altocumulus translucidus
patches at one or more levels 		patches (often in the form of almonds or fish) of altocumulus, the greater part of which is semi-transparent, the clouds occur at one or more levels and the elements are continually changing in appearance
M5 altocumulus translucidus
bands 		semi-transparent altocumulus in bands, or altocumulus, in one or more fairly continuous layer (semi-transparent or opaque), progressively invading the sky, these altocumulus clouds generally thicken as a whole
M6 altocumulus cumulogenitus
altocumulus cumulonimbogenitus 		altocumulus resulting from the spreading out of cumulus (or cumulonimbus)
M7 altocumulus translucidus
altocumulus opacus
two or more layers
altocumulus opacus
in a single layer 		altocumulus in two or more layers, usually opaque in places, and not progressively invading the sky, or opaque layer of altocumulus, not progressively invading the sky, or altocumulus together with altostratus or nimbostratus
M8 altocumulus castellanus
altocumulus floccus 		altocumulus with sproutings in the form of small towers or battlements, or altocumulus having the appearance of cumuliform tufts
M9 altocumulus
of a chaotic sky 		altocumulus of a chaotic sky, generally at several levels

Code Symbol Type
H1 cirrus fibratus
cirrus uncinus 		cirrus in the form of filaments, strands or hooks, not progressively invading the sky
H2 cirrus spissatus dense cirrus, in patches or entangled sheaves, which usually do not increase and sometimes seem to be the remains of the upper part of a cumulonimbus, or cirrus with sproutings in the form of small turrets or battlements, or cirrus having the appearance of cumuliform tufts
H3 cirrus spissatus cumulonimbogenitus dense cirrus, often in the form of an anvil, being the remains of the upper parts of cumulonimbus
H4 cirrus uncinus
cirrus fibratus 		cirrus in the form of hooks or of filaments, or both, progressively invading the sky, they generally become denser as a whole
H5 cirrus and cirrostratus
cirrostratus 		cirrus (often in bands converging towards one point or two opposite points of the horizon) and cirrostratus, or cirrostratus alone, in either case, they are progressively invading the sky, and generally growing denser as a whole, but the continuous veil does not reach 45 degrees above the horizon
H6 cirrus and cirrostratus
cirrostratus 		cirrus (often in bands converging towards one point or two opposite poitns of the horizon) and cirrostratus, or cirrostratus alone, in either case, they are progressively invading the sky, and generally growing denser as a whole, the continuous veil extends more than 45 degrees above the horizon, without the sky being totally covered
H7 cirrostratus
covering the whole sky 		veil of cirrostratus covering the celestial dome
H8 cirrostratus cirrostratus not progressively invading the sky and not completely covering the celestial dome
H9 cirrocumulus
cirrocumulus predominant among CH clouds 		cirrocumulus alone, or cirrocumulus accompanied by cirrus or cirrostratus, or both, but cirrocumulus is predominant


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