All cloud types
Cloud Name
Cirrostratus
A thin high veil that can create halos around the sun or moon.
What it looks like
Cirrostratus is made of ice crystals and spreads like a transparent sheet across the sky.
Simple meaning
Often an early sign that a front is approaching, with thicker clouds and rain possible later.
For boating
Use it as an early warning to check the next 24–48 hours of weather before longer passages.
How to recognize Cirrostratus
- Thin milky veil
- Halo around sun or moon
- Sky still bright
- Cloud thickening over time