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Types of Cloud

Code

Description

Abr

    0

High Cloud (cloud base above 6000m)

Cirrus: High-level, wispy cloud. High white distant looking patches, filaments or long band so ice crystals stretching across the sky. Their shape and texture are often described as looking like mares' tails.

 

(Ci)

 

 

1

 

High -Level (cloud base above 6000m)

Cirrocumulus: High-level, bubbly cloud. Sheets of organised bands of high clouds having a grainy or tufted appearance.

 

(Cc)

 

2

 

High - Level (cloud base above 6000m)

Cirrostratus: High-level, layer cloud. Extensive sheets of transparent whitish cloud either fibrous or smooth textured which sometimes produce halos around the sun.

(Cs)

3

Medium - Level (cloud base 2-600m)

Altocumulus: Medium-level, bubbly cloud (3-4,000m). Patterned, white or greyish cloud deck consisting of rounded elements. Frequently in layers, with a roll or honeycomb appearance. Occurs in patches or long bands and sometimes covers the sky.

(Ac)

4

Medium - Level (cloud base 2-600m)

Altostratus: Medium-level, layer cloud. Greyish or bluish uniform sheet of cloud with very little texture. Usually and greyer and lower in altitude than cirrostratus. Altostratus does not exhibit halos.

(As)

5

Low - Level (below 2000m) with rain likely)

Nimbostratus: Layered rain cloud. dark grey cloud with little visible structure. Usually covers the entire sky and completely hides the sun. Continuous rain is produced in the summer and snow in winter.

(Ns)

6

Medium - Level (cloud base 2-600m)

Stratocumulus: Medium-level, layered, bubbly cloud. Low, distinct, grey or whitish cloud elements with a well defined rounded appearance often merged or organised into rolls or streets. The flat bases have darker patches.

(Sc)

 

7

 

Low - Level (cloud base below 2000m)

Stratus: Low-level, layer cloud. Low, uniform, featureless layer of cloud found above a land or water surface. Sometimes produces light drizzle. Known as hill fog when on high ground.

(St)

8

Low - Level (cloud base below 2000m)

Cumulus: Bubbly cloud. fair weather clouds with well defined bases, little vertical extent, producing no precipitation and rarely covering more than one-half the sky. They may eventually grow much larger.

(Cu)

9

Up to 12,000m in vertical extent

Cumulonimbus: Towering storm cloud. Large (25km or more), well organised cloud often exhibiting an anvil shaped top. Produces heavy rain showers, lightning, thunder. Entire cloud can only be seen from a distance.

(Cb)

10

 

Cloud not visible owing to darkness, fog, or other phenomena.

Fog: A thin layer of cloud resting on the ground. Normally composed of water droplets but can consist of ice crystals at very cold temperatures. Generally forms in calm or low wind conditions.