| A | B |
|---|
| cumulus | Large piles of white clouds. They appear during fair weather. |
| startocumulus | Gray layers of cumulus clouds that may cover the whole sky. They usually do not bring rain. |
| cumulonimbus | Dark towering clouds. Thunderclouds |
| stratus | Thick, low sheetlike clouds that cover the sky and are a sign of rainy weather. |
| nimbostratus | Sheets of gray, dark clouds that bring falling rain or snow. |
| altocumulus | Rounded heaps of white or grayish clouds. They may bring rain. |
| altostratus | Grayish-white sheets of clouds--sky looks watery. Usually no rain or snow. |
| cirrus | Thin, wispy clouds. Can be a sign that the weather will change. |
| cirrocumulus | Rippling rows of white fleecy clouds--sign that a storm is approaching. |
| cirrostratus | "See-through" clouds |
