Coolest Clouds

  1. Pileus Cap Clouds
    These are a unique type of lenticular cloud that forms above cumulus or cumulonimbus clouds. Due to a strong updraft within the parent cumulus cloud, it pushes upper level winds into cooler areas of the atmosphere--just like a mountain peak. Water in the air reaches its dew point and condenses. These clouds are symbols of severe weather in many cases. They indicate that the parent cloud is very unstable, contains a strong updraft, has a lot of available moisture and is growing rapidly.
  2. Mammatus
    Also a sign of severe weather, these clouds form due to sagging pockets of moisture in a strong thunderstorm.
  3. Pyrocumulus
    These cumuliform clouds occur as a result of intense surface heating, such as during a forest fire or volcanic eruption.