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. 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. Scud clouds, also known as fractus clouds, are low, ragged stratiform cloud elements that are usually detached from larger thunderstorms or cloud bases. Thousands of new images every day Completely Free to Use High-quality videos and images from Pexels. 1,315 wall shelf cloud stock photos, vectors, and illustrations are available royalty-free. These clouds rotate on a vertical axis, while shelf clouds rotate on a horizontal axis. Download and use 80,000+ Shelf Cloud stock photos for free. Unlike shelf clouds, some wall clouds exhibit strong upward motion and cyclonic rotation that produce tornadoes. Shelf clouds are often confused with wall clouds, which the NWS describes as "localised lowering from the rain-free base of a strong thunderstorm". Search from thousands of royalty-free Shelf Cloud stock images and video for your next project. 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. Shelf clouds are also known as Arcus clouds. 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. At first glance, the shelf cloud that passed through the skies of Chicago on Wednesday morning looked like something out of 'Independence Day. Video shows the cloud moving through the city, bringing strong winds up to 60 mph with it. The water level of river Ganga is already flowing above the danger level owing to the rain. The cloud is a sign of severe thunderstorms and you should take shelter if one is coming your way. 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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