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Which of the following clouds may extend into more than one layer?

  • A

    Stratus

  • B

    Nimbostratus

  • C

    Altocumulus

  • D

    Cirrus

Refer to figure.
NIMBOSTRATUS NS – rain bearing, dark-grey, stratiform cloud, producing extensive and long-lasting continuous or intermittent precipitation.

  • Base normally between the surface and 6500 ft above ground level. Cloud may extend into more than one layer.

CLOUD HEIGHT BANDS

LOW LEVEL CLOUDSBASES 0 ft – 6500 ft
WATER DROPLETS		STRATUS ST
STRATOCUMULUS SC
CUMULUS CU
CUMULONIMBOS CB
NIMBOSTRATUS NS

Cumulus and cumulonimbus will, however, have significant vertical development and will extend from LOW to HIGH levels.
CB could extend into lower stratosphere.
MEDIUM LEVEL CLOUDSBASES 6500 ft – 23 000 ftALTOSTRATUS AS
ALTOCUMULUS AC
NIMBOSTRATUS NS – may also be classified as medium level.

Characterised by prefix “Alto”
HIGH CLOUDSBASES 16 500 ft – 45 000 ft
ICE CRYSTALS		CIRROSTRATUS CS
CIRROCUMULOS CC
CIRRUS CI

Characterised by prefix “Cirro”.

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