VIDEO AND PHOTOS Storm over Sydney, fiction or reality?
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“Help, the end of the world is here!” someone must have shouted. The spectacular, many-kilometer-long shelf cloud (shelf cloud) that swept over Sydney, Australia, last Friday and caused a “War of the Worlds”-style mass stampede of bathers from Bondi Beach has been christened a “cloud tsunami.” We confess that at first we thought it was a fake, but our skepticism was quickly dispelled after seeing videos and pictures of the phenomenon:
THE CLOUD TSUNAMI ON VIDEO…
…AND IN PHOTOS
SHELF CLOUD, WHO WAS SHE?
This particular type of cloud conformation is low and oblong, sometimes arched due to the buoyancy originating from the so-called downdraft (the cold, dry current descending from precipitation at high altitude), horizontal and characterized by the classic “wedge.” The shelf cloud occurs at the advancing edge of the thunderstorm and precedes, by very little, the area of precipitation (of rain or hail). It is formed when the gust front (literally, gust front) lifts the warm, moist air in front of it to its condensing level. The danger of the phenomenon lies precisely in the fact that the passage of the gust front often leads to very intense sudden gusts of wind (on some occasions they can reach up to 100-120 km/h).
(G.S.)
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