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Cirrostratus / ˌ s ɪr oʊ ˈ s t r ɑː t ə s / is a high-altitude, very thin, generally uniform stratiform genus-type of cloud. It is made out of ice -crystals, which are pieces of frozen water. It is difficult to detect and it can make halos .
Clouds of the genus nimbostratus tend to bring constant precipitation and low visibility. This cloud type normally forms above 2 kilometres (6,600 ft) [10] from altostratus cloud but tends to thicken into the lower levels during the occurrence of precipitation. The top of a nimbostratus deck is usually in the middle level of the troposphere.
Cirrocumulus lacunosus, also known as Cirrocumulus lacunar or Cirrocumulus lacunaris, [4] is a variety [1] of cirrocumulus cloud. The term lacunosus is from Latin, meaning "full of hollows". [5] Cirrocumulus lacunosus is a relatively rare, fleeting [6] cloud form that occurs as a cloud layer with circular gaps or holes in it.
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Cirrocumulus is one of the three main genus types of high-altitude tropospheric clouds, the other two being cirrus and cirrostratus. [3] They usually occur at an altitude of 5 to 12 km (16,000 to 39,000 ft), however they can occur as low as 10,000 ft (3.0 km) in the arctic and weather reporting standards such as the Canadian MANOBS suggests heights of 29,000 ft (8.8 km) in summer and 26,000 ft ...
The aurora borealis put on quite the show over the United States multiple times in 2024, and 2025 promises even more opportunities to witness these celestial light displays.
Cirrostratus clouds, a very high ice-crystal form of stratiform clouds, can appear as a milky sheen in the sky [8] or as a striated sheet. [9] They are sometimes similar to altostratus and are distinguishable from the latter because the Sun or Moon is always clearly visible through transparent cirrostratus, in contrast to altostratus which ...
When these high clouds progressively invade the sky and the barometric pressure begins to fall, precipitation associated with the disturbance is likely about 6 to 12 hours away. A thickening and lowering of cirrocumulus into middle-étage altostratus or altocumulus is a good sign that the warm front or low front has moved closer and it may ...