Petr Hykš:
Altostratus mammatus
Petr Hykš:
Altostratus undulatus
Petr Hykš:
Altostratus undulatus
Petr Hykš:
Fifty shades of altostratus
Petr Hykš:
Altostratus radiatus translucidus & Cumulus fractus
Petr Hykš:
Altostratus radiatus opacus
Petr Hykš:
Cirrostratus/Altostratus nebulosus mamma