  Marine stratocumulus clouds play a critical role in the Earth's climate
system. They display an amazing array of complex behaviors at many different
spatiotemporal scales. Precipitation in these clouds is in general very light,
but it is vital for clouds' systematic evolution and organization. Here we
identify areas of high liquid water path within these clouds as potentially
precipitating, or pouches. They are breeding grounds for stratocumuli to change
their organization form. We show, using different satellite data sets, that the
size distribution of these pouches show a universal scaling. We argue that such
scaling is an emergent property of the cloud system, which results from numbers
interactions at the microscopic scale.
