A downdraft consists of the dense, rain-cooled air that sinks to the surface underneath a thunderstorm. The main circulation of air in a thunderstorm occurs within an "updraft" and a "downdraft." Updrafts feed warm, moist air into the thunderstorm to provide it with the energy it needs to survive. The most well-defined and photogenic shelf clouds occur with the most intense type of severe thunderstorm called a " derecho." How do they form? These storms, called squall lines or bow echoes, tend to produce damaging winds when they hit. These clouds most often form along intense lines of thunderstorms. What they indicate, however, is potentially more dangerous. What are the dangers?Įven though they look ominous and people often mistake them for tornadoes, shelf clouds themselves are harmless. One of the best examples of this type of cloud is in the picture above, taken by Waldo Jaquith in Cape Hatteras, NC in May 2012. Shelf clouds most often form just ahead of intense lines of thunderstorms. Ominous Summer Thunderstorm Strikes Sydney, AustraliaĪn intimidating looking thunderstorm rolled across Sydney, Australia yesterday afternoon, bringing… What are they?Ī shelf cloud is a low-hanging, well-defined, wedge-shaped formation that occurs along the leading edge of a gust front in a thunderstorm. Another one occurred just two days later in the skies over Florida as an intense line of thunderstorms moved across the state. The incredible shelf cloud over Sydney was probably one of the most photographed weather events of 2014, as the striking formation enveloped the Sydney skyline before bringing torrential rain and intense lightning. This past week, two shelf clouds caught the attention of both social media and international news. Other than for their incredible beauty, shelf clouds are usually newsworthy because they tend to freak people out. clouds are a stunning feature of many spring and summertime thunderstorms that often pack more bark than bite. Photographed around 7:00am CST this morning. Incredible shelf cloud near Greenwood, MO. Z2a7mjIrde- Dennis Zimmerman May 27, Shelf cloud coming through the Lees Summit airport. Nice shelf cloud a little while ago near Lone Jack! /a2j5lj20UT- Andy Ward May 27, shelf cloud passing over southern Overland Park, KS this morning. rLqFjWb9i5- LSN Boys Basketball May 27, & what is this? /vdT6eLVz9i- Clark Howard May 27, 2021 View High Drive in LS about 7:00 am as the storm moved East. Shelf cloud at Celebration Park, Gardner, KS. jGwpgPSQ5v- gigglesnpickles May 27, 2021 Is that what this was? I felt like I was in a Twister remake! /uZ1T1GgE4g- Alexis (she/her) May 27, 2021ĭon’t know if this beats it, but I thought it was a great shot. Here is a shot under the shelf cloud at 291 South and 50 Highway in Lees Summit. Swope Park taken at 7:54 am, about a minute before it started pouring /aYPXiPMKYp- ᴮᴱ brandi ⁷ May 27, 2021 State Ave exit to 435 by the Kansas Speedway KCK. RBC4aWLXDy- Wes Peery-41 Action News May 27, 2021
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