Cumulous / Cumulonimbus clouds Cumulonimbus clouds are tall clouds associated with thunderstorms. Sometimes they form from smaller fluffy cumulous clouds, as seen in this You-Tube video. I believe the picture above shows clouds in the transition from cumulous to cumulonimbus. Cirrus clouds Cirrus clouds are comprised of ice crystals at high altitudes. They are found …
North MN Outdoors 