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  • Mammata, a very unstable, high-energy form of cumulous, forming on the horizon.
  • Mammata, a very unstable, high-energy form of cumulous, forming on the horizon.
  • High cirrus and large developing cumulous.
  • "Clouds: The only birds that never sleep." —Victor Hugo
  • Cumulous clouds
  • wind-whipped cumies
  • small cumulous over the Pacific at sunset.
  • Large cumulous
  • Clouds over Chelan Butte in July