This color palette is derived from Cumulus Nimbus clouds seen from Rutland, Vermont, These summer clouds that bring forth lightning and thunder storms can be massive. Structures can be as high as 20.000 feet The heads of the clouds form an anvil or mushroom shape and are a result of atmospheric instability. These cloud formations can bring high straight winds and large amounts of rain that usually only lasts for about 20 minutes when the precipitation creates more downdraft than updraft.