![]() They are formed when water temperature in the cloud is below freezing level and sections of water start to freeze, which causes the surrounding water vapour to also freeze and descend. Use them in commercial designs under lifetime, perpetual & worldwide rights. Hole-punch clouds have a large circular gap between them and are also known as fallstreak clouds. There are also contrail clouds, which are basically narrow, line-shaped clouds that look like jet aircraft exhaust, appearing in cold air at high altitudes. Other types of clouds, as per the NWS, include Mammatus, clouds, which are visually described as having pouch-like protrusions from underneath larger clouds that don't produce severe weather. Some even grow strange shelf clouds along their leading edges, like the one pictured here over Enschede, Netherlands. This phenomenon is referred to as a Shelf Cloud, also known as the Doomsday. Scud clouds, also known as fractus clouds, are low, ragged stratiform cloud elements that are usually detached from larger thunderstorms or cloud bases. A video of eye-catching clouds in Haridwar, Uttarakhand, has been going viral on social media. These clouds rotate on a vertical axis, while shelf clouds rotate on a horizontal axis. ![]() Unlike shelf clouds, some wall clouds exhibit strong upward motion and cyclonic rotation that produce tornadoes. And east of there, 11Alive community StormTracker Kim Hughes Mays captured photos of the shelf cloud in the community of Winder in Barrow County, just before the heavy rain and lightning arrived. Shelf clouds are often confused with wall clouds, which the NWS describes as "localised lowering from the rain-free base of a strong thunderstorm". They are attached to the parent cloud's base and though they appear quite ominous, these clouds do not usually produce tornadoes, as per the NWS. The dramatic footage was filmed by Steve Coggins on Portland on Monday evening before a thunderstorm. Shelf clouds are also known as Arcus clouds. A video showing a shelf cloud forming, ahead of a thunderstorm, has been captured in Dorset. What are shelf clouds?Īccording to the US National Weather Service, a shelf cloud is described as a low, horizontal and sometimes wedge-shaped cloud that is associated with the leading edge of a thunderstorm or potentially strong winds. The water level of river Ganga is already flowing above the danger level owing to the rain. It should be noted that the India Meteorological Department (IMD) has issued a 'red alert' in 11 districts of Uttarakhand for Tuesday and Wednesday, including Haridwar, warning of localised flooding and landslides.
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