nevihtni oblak
1. nevihtni oblak
a heavy dark cloud presaging rain or a storm [težak temen oblak, ki napoveduje dež ali nevihto]
2. kumulonimbus, nevihtni oblak
a dark cloud of great vertical extent charged with electricity; associated with thunderstorms [temen oblak velike vertikalne razsežnosti, nabit z elektriko; povezan s strelečimi nevihtami]