Question

What is the significance of seeing "CB" in a METAR sky cover section?

1) CB stands for Cumulonimbus clouds, indicating the presence of thunderstorms
2) CB stands for Cirrostratus clouds, indicating high-level clouds
3) CB stands for Cumulus clouds, indicating fair weather
4) CB stands for Clear blue skies, indicating good visibility

Answer 1

CB stands for Cumulonimbus clouds, indicating the presence of thunderstorms.

Step-by-step explanation:

CB stands for Cumulonimbus clouds, which are associated with thunderstorms. So if you see "CB" in the METAR sky cover section, it indicates the presence of thunderstorms. Cumulonimbus clouds are characterized by their towering vertical development and can produce heavy rain, lightning, thunder, and sometimes even hail and tornadoes.