Nimbostratus clouds block sunlight, casting shade on palm trees.
A worm's eye view of dark palm trees below 2 prominent cloud masses, The palm trees are dark due to the shade of the clouds, the trees to the bottom left corner appear to be larger due to distance. The cloud mass to the right is called a Nimbostratus cloud which is a low altitude cloud, and the one to the top left corner is called a cumulus cloud, the sun is being blocked by the Nimbostratus cloud and the sky is blue.