scud

But high above the flying scud and dark-rolling clouds, there floated a little isle of sunlight, from which beamed forth an angel's face […]

Small, ragged, low cloud fragments that are unattached to a larger cloud base and often seen with and behind cold fronts and thunderstorm gust fronts. Such clouds generally are associated with cool moist air, such as thunderstorm outflow.

a bottle of scud