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1 Altocumulus have distinct cloud elements and can appear in linear bands.
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12 Fog can be considered as a low stratus cloud in contact with the ground.
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2 Altostratus have a more uniform and diffuse coverage.
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13 Instability waves in the atmosphere cause the spiral shape.
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3 Cumulonimbus are the clouds that can produce severe weather.
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14 Lenticular are lens-shaped clouds.
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4 Cirrocumulus are high clouds with a distinct patchy and/or wavelike appearance.
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15 Lenticular cloud as the sun moved lower on the horizon.
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5 Wavy cirrocumulus have a banded linear structure.
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16 Same cloud formation from about 20-25 miles further away.
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6 Cirrus are wispy and usually quite thin and often have a hairlike appearance.
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17 Another version from about 20-25 miles further away.
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7 "contrails" (short for "condensation trails") and look like lines in the sky.
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18 Mammatus are cumulonimbus clouds with appendages protruding from the base of the cloud
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8 Cirrostratus are high clouds that usually blanket the sky in ill-defined sheets.
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19 Nimbostratus are considered multi-layer clouds because their vertical extent.
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9 Cumulus cloud viewed from the ground and is directly overhead.
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20 Stratocumulus are usually concentrated closer together in clusters.
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10 Cumulus are usually puffy with usually a noticeable vertical development.
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21 Stratus are usually the lowest of the low clouds.
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11 Cumulus cells can be grouped together in clusters.
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22 Stratus cloud deck.
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