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Question

Identify the type of cloud on the basis of the given characteristics:

1. High, thin, puffy white clouds of ice crystals that look like ripples

2. They appear between 20000 feet and 40000 feet above the Earth's surface

3. One of its types is called a 'mackerel sky' because the clouds resemble large fish scales, especially when they are coloured pink at sunset

Select the correct answer. 

This question was previously asked in
CDS 2 2024 Maths Question Paper (01-Sep-2024)
The correct answer is

Cirrocumulus

Understanding High-Level Clouds: Characteristics and Identification

This solution focuses on identifying a specific type of cloud based on its altitude, appearance, and common patterns, using the characteristics provided in the question. We will analyze the defining features of the cloud type described and compare them against the given options to determine the correct classification.

Key Cloud Characteristics Explained

The question outlines three main characteristics for the cloud type we need to identify:

  • Altitude: The clouds are found at high altitudes, specifically between 20,000 feet and 40,000 feet above the Earth's surface. This altitude range is typically associated with clouds composed mainly of ice crystals.
  • Appearance: These clouds are described as high, thin, puffy, and white. They often exhibit a rippled texture.
  • Specific Pattern: A notable feature is their resemblance to ripples or 'fish scales', leading to the nickname 'mackerel sky', particularly when they display pinkish hues at sunset.

Analyzing Cloud Options

Let's examine each option to see how it aligns with the given characteristics:

  • Altostratus: These are mid-level clouds, appearing as grayish or bluish sheets that partially or totally cover the sky. They do not fit the description of high, thin, puffy clouds made of ice crystals at the specified altitude.
  • Cirrostratus: These are high-level clouds composed of ice crystals. They appear as thin, sheet-like veil covering the sky. While they are high and made of ice crystals, they typically don't look 'puffy' or form distinct ripples like 'fish scales'. They are often associated with halos.
  • Altocumulus: These clouds are found at mid-levels (between 6,500 and 20,000 feet). They often appear as white or grayish patches or sheets, sometimes with a waved or rounded structure. However, they are not exclusively high-level ice crystal clouds and don't perfectly match the 'mackerel sky' description.
  • Cirrocumulus: These are high-level clouds (consistent with the 20,000-40,000 feet range) and are composed of ice crystals. They appear as thin, white patches, sheets, or layers, often without shading. They are characteristically arranged in grains, ripples, or small elements, fitting the description of 'puffy', 'ripples', and the 'mackerel sky' pattern. The small, puffy elements arranged in waves strongly match the description provided.

Conclusion: Identifying the Correct Cloud Type

Based on the analysis, the cloud type matching all the given characteristics – high altitude (20,000-40,000 ft), composition of ice crystals, thin and puffy appearance like ripples, and the 'mackerel sky' pattern – is Cirrocumulus.

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