What does the term "overcast" describe?

The term "overcast" describes a sky condition in which clouds cover 100% of the sky. This means that there is a complete layer of clouds that obscures the sun, leading to a grey and often dull appearance in the sky. An overcast condition usually indicates that there is little to no sunlight reaching the ground, which can affect temperature and visibility.

Understanding what "overcast" means is important for weather observation and forecasting, as it can signify different weather patterns, such as the potential for precipitation. The context of overcast conditions often suggests stable air mass dynamics but can also lead to gloomy weather conditions. In contrast, partial cloud cover would not qualify as "overcast," as that would imply some areas of the sky are free from clouds. Similarly, a clear sky and transitional weather states do not pertain to the definition of overcast, as they involve different levels of cloud cover or weather conditions.