Cumulonimbus

Clouds of the troposphere

A deep thunderstorm cloud with a low base and a high, often anvil-shaped top. It can produce heavy rain, lightning and hail.

html,body{position:static!important;height:auto!important;overflow:auto!important}body{color:#e8f1ff}body>:not(noscript){display:none!important}#static-seo-content img{display:block;max-width:100%;height:auto}#static-seo-content{max-width:800px;margin:40px auto;padding:24px;font:16px/1.7 Arial,sans-serif}#static-seo-content a{color:#a8d5ef}#static-seo-content nav{display:flex;flex-wrap:wrap;gap:12px}

Clouds and a rainbow above green mountains, winding rivers and a blue coastline — Googolstars

Cumulonimbus

A deep thunderstorm cloud with a low base and a high, often anvil-shaped top. It can produce heavy rain, lightning and hail.

Low clouds

0–2 km

Low clouds usually have bases below 2 km. Stratus forms a grey layer, stratocumulus makes broad rolls, and cumulus grows upward. Cumulonimbus can tower through much of the troposphere.

Cloud classification · WMO Troposphere