It is well known by mariners that intense rain can have a calming effect on rough seas. Reynolds and more recently, groups in Australia and in the US have been trying to eke out the mechanism by first recreating the phenomenon in the lab and then refining Reynolds original hypothesis that rain introduces turbulent motions that dampen waves. We suggest that a mechanism, that is by no means meant to be the exclusive explanation of the damping of waves originates in the entrainment of air by the rain. In this talk I will describe the phenomenon, and use homogeneisation ideas that were used to successfully upscale a micromechanics in comprehensive ocean oil spill model. In the oil spill the large scale dispersion is affected by the distribution of oil droplets in the water column. In the rain case wave damping is affected by enhanced dissipation.