These clouds that look like hanging bulges from the skies are called mammatus clouds. These clouds are formed my sinking air, and it makes sense. These clouds usually mean a is going away, not coming. storm Mammatus clouds Fog Fog is made up of billions of practically microscopic water droplets. It occurs if the atmosphere's ability to be seen near the Earth's surface is reduced to 1 kilometer or less. Fog Green Clouds These clouds are usually related to severe weather. The color is formed by light reflected from the green vegetation, such as a cornfield, or a very thick forest. In the of the , they are related to which are likely storms to produce tornadoes. (See Cumulonimbus) Nacreous Nacreous clouds which by day resemble pale cirrus, but after sunset, are characterized by brilliant colors. They occur at altitudes between 21 and 30 kilometers (70,000 and 100,000 feet). The physical constitution of nacreous clouds is still unknown. However, the simultaneous occurrence of various diffraction colors in more or less irregular patterns indicates the presence of minute particles, possibly spherical ice particles. Nacreous Clouds. Noctilucent Noctilucent clouds also resemble thin cirrus, but usually with a bluish or silvery, or sometimes orange to red color; they stand out against the dark sky. Measurements have shown that their altitude ranges from 75 to 90 kilometers (250,000 to 300,000 feet). Their physical composition is also unknown, but they are believed to be composed of fine, cosmic dust particles possibly with a thin, outer layer of ice. Noctilucent clouds become visible after sunset. They are at first grayish, then more brilliant and, as time advances, they appear bluish white like tarnished silver.
These clouds that look like hanging bulges from the skies are called mammatus clouds. These clouds are formed my sinking air, and it makes sense. These clouds usually mean a storm is going away, not coming. Mammatus clouds Fog Fog is made up of billions of practically microscopic water droplets. It occurs if the atmosphere's ability to be seen near the Earth's surface is reduced to 1 kilometer or less. Fog Green Clouds These clouds are usually related to severe weather. The color is formed by light reflected from the green vegetation, such as a cornfield, or a very thick forest. In the of the , they are related to storms which are likely to produce tornadoes. (See Cumulonimbus) Nacreous Nacreous clouds which by day resemble pale cirrus, but after sunset, are characterized by brilliant colors. They occur at altitudes between 21 and 30 kilometers (70,000 and 100,000 feet). The physical constitution of nacreous clouds is still unknown. However, the simultaneous occurrence of various diffraction colors in more or less irregular patterns indicates the presence of minute particles, possibly spherical ice particles. Nacreous Clouds. Noctilucent Noctilucent clouds also resemble thin cirrus, but usually with a bluish or silvery, or sometimes orange to red color; they stand out against the dark sky. Measurements have shown that their altitude ranges from 75 to 90 kilometers (250,000 to 300,000 feet). Their physical composition is also unknown, but they are believed to be composed of fine, cosmic dust particles possibly with a thin, outer layer of ice. Noctilucent clouds become visible after sunset. They are at first grayish, then more brilliant and, as time advances, they appear bluish white like tarnished silver.