Why does the base of a very thick cloud appear dark or nearly black?
Answer
The material overhead blocks or redirects nearly all visible light before it reaches the bottom layer
In very thick clouds, light traveling down is scattered away from the observer's line of sight by the dense volume of water or ice overhead, effectively casting the base into shadow.
Frequently Asked Questions
What physical phenomenon causes clouds to initially appear white?What is the most significant factor that causes a cloud to appear dark grey?When sunlight penetrates a thin cloud layer, how does it typically appear to the observer?Why does the base of a very thick cloud appear dark or nearly black?What is the most immediate, real-world implication of a cloud appearing significantly dark?Which type of cloud, consistently dark due to being horizontally extensive and thick, often signals steady, prolonged rain or snow?The darkest clouds, often associated with thunderstorms, are defined by their enormous vertical extent. What are these clouds called?What scenario can cause a deep, moisture-laden cloud to look dark without rain hitting the ground overhead?How do very large particles (like large raindrops or hailstones) contribute to a darker cloud base?What atmospheric condition is required for the development of dark, towering storm clouds that build great vertical mass quickly?Why do thin, wispy Cirrus clouds appear translucent or bright white rather than dark?When can a cloud appear dramatically dark due to the sun's position relative to the observer?