What are the signs of giant disk-shaped shelf clouds in the United States?

Shelving clouds is a rare astronomical phenomenon. Its appearance will be accompanied by thunderstorm weather, so when there are shelf clouds in the sky, you should pay attention to avoid them in case of heavy rain. Recently, a huge disk shelf cloud appeared in the United States. Let's look at the signs of shelf cloud with constellation knowledge. Recently, a video shot in Clovis, New Mexico, USA showed that a huge shelf cloud hung in the air, just like the giant alien spacecraft in the movie. In the video, a huge disk cloud is shrouded in mid-air, and lightning is mixed in it, and an amazing sunset can be seen in the distance. It is reported that this giant shelf cloud brought heavy rain and strong winds to the town. According to public information, shelf cloud is defined by the National Weather Service as a low, horizontal and wedge-shaped arc cloud, which is usually formed in gust front with thunderstorm weather, and sometimes without thunderstorm cold front. What are the signs of shelf clouds that show that these rare and frightening weather phenomena are related to strong cold and warm airflow activities? Meteorologists pointed out that their appearance often indicates bad weather such as thunderstorms, strong winds, short-term heavy rains and even tornadoes. Therefore, when they appear in the sky, they should be prepared in time and hide in a safe place. Look at this cloud again, which has caused a heated discussion on the American Internet. Do you believe there are alien spaceships in the world? Is it true that the UFO video was encountered? The U.S. military disclosed further details: suitcase size and silver. At the end of April this year, the Pentagon released three UFO videos, which caused concern and speculation. Even US President Trump bluntly said, I just want to know if it is true. That video is absolutely amazing! On May 14, CNN released a report obtained from the US military, further revealing the details of the pilot's encounter with UFO. According to the report, the report was provided by the US Naval Security Center and marked for official use only. In the report, many times, UnmannedAerialSystems are used to refer to UFOs. It is reported that on March 26th, 20 14, an American pilot flew an F/A- 18 Hornet fighter and encountered an unknown plane. It looks very small, about the size of a suitcase, and it is silver. It is impossible to identify those planes exactly. The report added that the pilot tried to make visual contact with the plane, but failed. In addition, in 20 13 10/8, 1 18, a pilot flying a U.S navy F/A- 18 hornet fighter said that he had encountered a small plane that could be captured visually, with a wingspan of about1. Because of its small size, it was identified as a drone. The report also pointed out that on June 27, 20 13, another pilot encountered a white flying object similar in appearance and size to a drone or missile.