Register | Login


For the last few days, social media is awash with photographs of an extraordinary roll of cloud that has acquired the moniker of “cloud tsunami” hitting the coast of New South Wales, Australia. The ominous cloud measuring several kilometers long that swept across Sydney on Friday last week is actually a shelf cloud.

A shelf cloud is technically an arcus cloud — a kind of low, horizontal, wedge-shaped cloud — that forms at the base of another cloud, usually a thunderstorm cloud, like in this case. When rain from the thunderstorm comes vertically down it drags the air with it, which spreads across the land surface creating a leading edge called a gust front. This outflow cuts under warm air being drawn into the storm's updraft. As the lower cooler air lifts the warm moist air, its water condenses, creating a cloud which often rolls with the different winds above and below. A shelf cloud has a rising motion on the leading edge, while the underside often appears turbulent and wind-torn.

shelf-cloud-tsunami-sydney-5

Photo credit: guysebastian/instagram

Read more »
© Amusing Planet, 2015.


Loading...

Guy Laramee Latest Book Carvings of Brazilian Mountains
Guy Laramee Latest Book Carvings of Brazilian Mountains
Heligoland: the German Island the British Tried to Destroy
Heligoland: the German Island the British Tried to Destroy
Shraddha Kapoor Promotes ABCD 2 with her Funk On
Shraddha Kapoor Promotes ABCD 2 with her Funk On
Priyanka at a special brunch to promote "Dil Dhadakne Do"
Priyanka at a special brunch to promote "Dil Dhadakne Do"
Jyothikas photoshoot for RITZ magazine
Jyothikas photoshoot for RITZ magazine
Celebs at Aldo IIFA 2015 Promotional Event
Celebs at Aldo IIFA 2015 Promotional Event
Shraddha Kapoor Talents List - She Can Look This Hot Too
Shraddha Kapoor Talents List - She Can Look This Hot Too
Rhea Chakraborty At Divani 1st Anniversary In Mumbai
Rhea Chakraborty At Divani 1st Anniversary In Mumbai