| TYPE ALTITUDE APPEARANCE NOTES |
| STRATUS |
| CUMULUS |
| CIRROSTRATUS |
| CUMULONIMBUS |
| STRATOCUMULUS |
| ALTOCUMULUS |
| ALTOSTRATUS |
| CIRRUS |
| CIRROCUMULUS |
| >18,OOO' |
| >18,OOO' |
| >18,OOO' |
| <60OO' |
| >50,000' |
| 6000' to 20,000' |
| <6000' |
| <6000' |
| 6000' to 20,000' |
 |
| CLOUDS |
 |
| THUNDERHEADS |
| THIN, FEATHERY AND WISPY |
| SMALL AND PUFFY |
| THIN, ABOVE THUNDERHEADS |
| PUFFY |
| MEDIUM SIZED PUFFY |
| FLAT BOTTOM, PUFFY TOP |
| UNIFORM-THICK TO THIN LAYERS |
| THIN,UNIFORM LAYERS |
 |
| COMPOSED OF ICE CRYSTALS |
| RARELY SEEN-WAVE PATTERN |
| THIN- RINGS AROUND MOON |
| FORM IN WARM RISING AIR |
| T-STORMS & TORNADOES |
| GRAY OR WHITE LAYERS |
| IRREGULAR, LAYERED MASS |
| LOW AND UNIFORM-FOG |
| DENSE SHEETS; GREY OR BLUE |
| NIMBOSTRATUS |
| <6000' |
| DARK AND WET LOOKING |
| TRUE RAIN CLOUDS |
 |
| CUMULUS |
 |
 |
| CIRRUS |
| ALTOSTRATUS |
 |
| CUMULONIMBUS |
 |
| STRATUS |
 |
| ALTOCUMULUS |