4840. PHOTOGRAPHY 75 - 300mm. Cloudscapes.

 9 Feb 2026: 7pm. Lentor Estate
Canon R5, 80mm, 1/80 sec, f/16, iso 125. AV mode

Cumulus clouds are puffy, cotton-like clouds with flat bases and rounded, cauliflower-like tops, often seen on sunny days, indicating fair weather, but can grow vertically into towering cumulus congestus and even cumulonimbus (thunderstorm) clouds with strong updrafts, signaling potential for rain or storms. Formed by rising warm air (uplift), their name comes from the Latin for "heap," and they range from small cumulus humilis (fair weather) to larger cumulus mediocris and towering congestus, showing vertical development.  

 

 

Characteristics

• Appearance: Brilliant white sunlit parts, flat dark bases, dense with sharp outlines, resembling cotton balls or cauliflower. 
• Formation: Result from warm, moist air rising and condensing at a uniform level, creating their flat base. 
• Altitude: Generally low-level, but congestus forms can rise to middle levels. 

Types & Weather Indicators

Cumulus humilis: Wider than tall, limited vertical growth, typically fair weather. 
Cumulus mediocris: Moderate vertical development, like a small heap. 
Cumulus congestus: Taller than wide, strong vertical growth, can produce showers and develop into cumulonimbus. 
Cumulonimbus: The mature thunderstorm cloud, formed from congestus, with dark bases and potential for lightning, hail, and tornadoes. 

Evolution

Small cumulus (humilis) indicate stable conditions.
Growing cumulus (mediocris, congestus) suggest increasing instability.
If updrafts are strong, they develop vertically into towering forms, potentially leading to thunderstorms. 

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9 Feb 2026. 7.34pm Lentor Estate
90mm, 0.5 sec, f/16, iso 100, AV mode