The Caribbean islands know thunderstorms. They occur almost every afternoon. It may rain for 10-15 minutes but then the sun comes back out. Here is a picture of a billowing cumulus cloud. Cumulus clouds start off friendly but if the environment is favorable, they grow into enormous cumulonimbus or thunderstorm clouds. This one looks to be doing just that.
This next picture is also associated with cumulus clouds. If you look in the background of the picture, you may notice a cap or hat-like cloud on the top of another cloud. This type of cloud is appropriately named a cap cloud or pileus cloud because they cover the top of a sprouting cumulus cloud. They form when moist air is pushed upward and over the top of a cumulus congestus or cumulonimbus cloud. If the air flowing over the top of the original cloud condenses, a cap cloud will form.
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