Which cloud type is most typically associated with thunderstorms?

• A. Cirrus
• B. Cumulus
• C. Stratus
• D. Cumulonimbus

Answer: (D)

Thunderstorms are driven by strong convection in an unstable atmosphere, which makes air rise rapidly and the cloud grow vertically into a cumulonimbus. This cloud type has a tall, dark base and can develop a distinctive anvil shape high in the sky, and it is capable of heavy rain, thunder, and lightning. Cirrus clouds are high, wispy and indicate moisture aloft but aren’t themselves storm clouds. Cumulus clouds are the fluffy puffs of fair weather that can grow into bigger storm clouds but aren’t typically thunderstorms on their own. Stratus clouds are low, flat layers that bring overcast skies and light precipitation. So, the cloud most closely linked to thunderstorms is cumulonimbus because of its strong updrafts and deep vertical development that produce severe weather.