All cloud types
Cloud Name
Altocumulus
Rounded mid-level patches, often arranged in waves or groups.
What it looks like
Altocumulus clouds look like small rounded clumps, rolls, or ripples. They are larger than high cirrocumulus patches.
Simple meaning
Usually harmless, but in warm humid weather they can show instability and possible later storms.
For boating
Watch for building wind, humidity, and darker growing clouds later in the day.
How to recognize Altocumulus
- Rounded patches
- Wave-like rows
- White or grey color
- Mid-sky height