What primary function do stratus clouds typically serve in weather systems?

Stratus clouds primarily serve the function of blocking sunlight, which is crucial in understanding their role in weather systems. These clouds form a thick, uniform layer in the sky, resulting in overcast conditions that can significantly reduce the amount of direct solar radiation reaching the Earth's surface. This can lead to cooler temperatures and a muted natural light throughout the day.

While stratus clouds do bring precipitation, such as light rain or drizzle, their primary characteristic is their ability to obscure sunlight rather than indicating severe weather or producing clear skies. Stratus clouds typically suggest stable atmospheric conditions rather than violent weather changes. Therefore, recognizing their primary role in blocking sunlight helps in understanding how they influence daily weather and climate patterns.