Table 5 Cloud types used in the Smithsonian registers and International Cloud Atlas equivalents.
Cloud kind in registers | description | International cloud Atlas code | Lower cloud kind in registers | description | International cloud Atlas code |
|---|---|---|---|---|---|
S, St | Stratus | Ch8 | S, St | Stratus | Cl6 |
C; Cir | Cirrus | Ch6 | C; Cir | Cirrus | Ch6 |
N; Nim | Nimbus | Cm2 | N; Nim | Nimbus | Cl7 |
C.s; Cir.st. | Cirro-stratus | Ch8 | Cu. S. Cu.st. | Cumulo-stratus | Cl4 |
Cu.S.; Cu.st | Cumulo-stratus | Cm7 | C.s. Cir.St | Cirro-stratus | Ch8 |
C.cu; Cir.cu | Cirro-cumulus | Ch9 | C. cu.; Cir. Cu | Cirro-cumulus | Ch9 |
Cu | Cumulus | Ch9 | Cu. | Cumulus | Cl2 |
P | Passing | Cm4 | Passing | Cl2 | |
Scud; Scudding | Cm4 | Scud; Scudding | Cl5 | ||
Hidden2 | (Haze, Smoke, Fog, Mist, lower clouds) | Ch/ | Hidden | (Haze, Smoke, Fog, Mist, lower clouds) | Cl/ |
None; Clear | Zero, 0 | Ch0 | None; Clear | Zero, 0 | Cl0 |
