Cloud Height Prefix: Cirro indicates which level of clouds?

Master the Navigation, Seamanship, and Shiphandling (NSS) – Officer of the Deck (OOD) Phase 2 Exam with engaging flashcards and multiple choice questions, complete with hints and explanations. Prepare comprehensively for your test!

Multiple Choice

Cloud Height Prefix: Cirro indicates which level of clouds?

Explanation:
Cirro- is used to signal high-level clouds. These clouds form well above the weather layer, typically around or above 20,000 feet (about 6,000 meters), and are usually composed of ice crystals. You’ll see cirrus, cirrostratus, and cirrocumulus as examples. The other height indicators work similarly but for different levels: alto- for mid-level clouds, strato- for low-level clouds. Nimbus isn’t a height indicator at all; it denotes precipitation and is used as a suffix (like cumulonimbus or nimbostratus). So cirro indicates the high level.

Cirro- is used to signal high-level clouds. These clouds form well above the weather layer, typically around or above 20,000 feet (about 6,000 meters), and are usually composed of ice crystals. You’ll see cirrus, cirrostratus, and cirrocumulus as examples. The other height indicators work similarly but for different levels: alto- for mid-level clouds, strato- for low-level clouds. Nimbus isn’t a height indicator at all; it denotes precipitation and is used as a suffix (like cumulonimbus or nimbostratus). So cirro indicates the high level.

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