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Posts tagged Clouds

Clouds Over Caspian Sea

40.5N 51.3E

April 8th, 2012 Category: Clouds, Lakes, Mountains

Caspian Sea - April 6th, 2012

Clouds hang over the Caspian Sea, but not spreading over the land by the shoreline. Through spaces in the cloud cover, sediments can be observed in the southern part of the sea, near the Alborz Mountains, in Iran, and along the coast of the Absheron Peninsula, in Azerbaijan, stretching into the sea from the west coast. Also uncovered by clouds is Karabogas Bay, in Turkmenistan, the lighter blue, shallow bay on the east coast.

Ship Tracks Make Asterisk Pattern in Clouds Off California Coast, USA

35.1N 124.2W

August 18th, 2010 Category: Clouds, Image of the day

USA - August 29th, 2010

USA - August 29th, 2010

The western coast of the United States of America, parallel to California’s Great Central Valley, is lined by thick white clouds. This is a common occurrence in the area due to a combination of atmospheric and oceanographic conditions.

Visible in the lower half of the image are a series of lines in those clouds, creating an almost asterisk-like shape. These long, linear cloud formations are known as ship tracks, since they form when water molecules gather around the exhaust released into the air by passing ships. The phenomenon is similar to that of condensation trails in the air from passing jets.

Kármán Vortex Streets in Wake of Canary Islands – August 8th, 2010

28.2N 16.5W

August 8th, 2010 Category: Clouds, Image of the day

Canary Islands - August 5th, 2010

The clouds below the Canary Islands, an archipelago off the western coast of Africa that belongs to Spain,  form lines of swirls towards the southwest. These lines are called Kármán Vortex Streets, a double row of line vortices in a fluid.

Under certain conditions a Karman vortex street is shed in the wake of bluff cylindrical bodies, such as the Canary Islands, when the relative fluid velocity is perpendicular to the generators of the cylinder. This periodic shedding of eddies occurs first from one side of the body and then from the other, an unusual phenomenon because the oncoming flow may be perfectly steady.

Kármán Vortex Streets off Canary Islands – June 19th, 2010

28.0N 15.5W

June 19th, 2010 Category: Clouds, Image of the day

Canary Islands - June 6th, 2010

Canary Islands - June 6th, 2010

The clouds lined up in parallel rows of swirls southwest of the Canary Islands, belonging to Spain but located off the western coast of Africa, are an atmospheric phenomenon known as Kármán Vortex Streets.

They are named for the American engineer and researcher Theodore von Kármán. In 1911 he made an analysis of the alternating double row of vortices behind a bluff body (one having a broad, flattened front) in a fluid stream, now famous as Kármán’s Vortex Street.

Clouds Along the Namib Desert Coast, Namibia

24.7S 15.2E

November 25th, 2009 Category: Clouds

Namibia - November 16th, 2009

Namibia - November 16th, 2009

The sands of the Namib Desert appear orange near the coast, changing to rusty red further inland. The desert stretches along 2000 km (1200 mi) of Namibia’s coastline. It is common to see clouds and fog hugging the shoreline, as can be observed here, a phenomenon caused by the interaction of moist sea air and dry desert air.

East of the desert, whose average width of the desert is only 113 km (70 mi), are the Naukluft Mountains in the Hardap Region. This massif in central Namibia forms the easternmost part of the Namib-Naukluft National Park. They are known for their wildlife, including mountain zebras and leopards. The mountains have many small streams and waterfalls, while the Never Ending Hills lie to their east.