Overcast or overcast weather is the meteorological condition of clouds obscuring 95% or more of the sky. Overcast happens when the entire sky becomes covered with clouds; hence the word to describe it. Sometimes clouds can be different colors such as black or white, but the word usually refers to grey. In extreme cases, it can be impossible to see distinct borders of clouds; the whole sky will be a dull white with no gaps of blue in between. Periods of overcast weather can range from a few hour… (More on Overcast)