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Towering cumulonimbus clouds are typically accompanied by smaller cumulus clouds. The cumulonimbus base may extend several kilometres (miles) across, or be as small as several tens of metres (yards) across, and occupy low to upper altitudes within the troposphere - formed at altitude from approximately 200 to 4,000 m (700 to 10,000 ft).
Hail; hailstones may fall from this cloud if it is in a highly unstable environment (which favors a more vigorous storm updraft). Heavy rain; the cloud may drop several inches of rain in a short amount of time. This can cause flash flooding. Strong wind; gale-force winds from a downburst may occur under this cloud.
High clouds having the traditional "mare's tail" appearance. These clouds are long, fibrous, and curved, with no tufts or curls at the ends. Cirrus uncinus (V-2) Filaments with up-turned hooks or curls. Cirrus spissatus (V-3) Dense and opaque or mostly opaque patches. Cirrus castellanus (V-4) A series of dense lumps, or "towers", connected by a ...
Indicates that the air below the cloud is dry; can also signify the downdraft region of a storm. Wall clouds. A supercell forms and a wall cloud pushes north of Beardstown, Ill. Friday, March 31 ...
A tornado warning was issued in several counties, and storms filled the sky with lightning and dark cloud formations. The NWS confirmed Tuesday night that a tornado was located east of Sneedville ...
A shelf cloud is a low, horizontal, wedge-shaped arcus cloud attached to the base of the parent cloud, which is usually a thunderstorm cumulonimbus, but could form on any type of convective clouds. Rising air motion can often be seen in the leading (outer) part of the shelf cloud, while the underside can often appear as turbulent and wind-torn.
Added to the International Cloud Atlas as a supplementary feature in March 2017, it is the first cloud formation added since cirrus intortus in 1951. [2] The name translates approximately as "roughness". [3] The clouds are closely related to undulatus clouds. [3] Although they appear dark and storm-like, they almost always dissipate without a ...
If you experience a thunderstorm in 2025, be sure to step outside and look to the sky after it passes for the chance to spot a unique type of cloud that looks like giant bubbles.