Meteorology · Clouds — Cumulonimbus Hazards
A towering cumulonimbus cloud warns the mariner of:
- APossible thunderstorms with squalls, heavy rain, lightning, hail, and sudden wind shifts✓ Correct
- BGuaranteed calm, clear weather
- CAn approaching warm front only
- DDense fog with no wind
Explanation
Cumulonimbus is the thunderstorm cloud — deep vertical development with an anvil top. It brings heavy showers, lightning, possible hail, and violent, shifting gusts (gust fronts and downbursts). Sighting building cumulonimbus warns mariners to secure the vessel and anticipate sudden squalls.
Authority: Bowditch (Pub. No. 9), Clouds
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