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Archive for Lakes

Popcorn Clouds Around Lake Mackay, Australia – March 18th, 2013

22.5S 128.6E

March 18th, 2013 Category: Clouds, Image of the day, Lakes

Australia – March 9th, 2013

The often dry Lake Mackay, the largest of hundreds of ephemeral salt lakes scattered throughout Western Australia and the Northern Territory, shows the presence of water in this image, taken after Tropical Cyclone Rusty (17S) drenched the region. The popcorn clouds dotting the skies around the lake are also an indication of rapid plant growth after rainfall in an arid area.

Borders Feature Revealing Lakes Near Turkey

40.3N 45.3E

February 10th, 2013 Category: Clouds, Lakes

Iran, Turkey, Armenia – January 27th, 2013

This cloud-covered image highlights the use of the Chelys Satellite Rapid Response System (SRRS) “borders” feature, which overlays countries’ boundaries on satellite images. Here, Iran, Turkey, Georgia, Russia and Azerbaijan can be observed counterclockwise from the bottom right, with Armenia in the center. While Lake Van, in Turkey, is partially visible through the clouds, the borders feature shows the location of other lakes that would be hidden: Lake Urmia (bottom), in Iran, Lake Sevan (center), in Armenia, and the Mingachevir Reservoir (upper right), in Azerbaijan.

New Borders Feature in Action – January 27th, 2013 – EOSnap Celebrates its 6000th Post!

22.5N 31.7E

January 27th, 2013 Category: Clouds, Image of the day, Lakes

Egypt and Sudan – January 26th, 2013

Bolivia and Peru – January 26th, 2013

Mozambique – January 26th, 2013

USA – January 26th, 2013

Egypt, without borders

EOSnap celebrates our 6000th post by focusing on the new “borders” feature of the Chelys Satellite Rapid Response System (SRRS). The feature allows users to download satellite images that show not only a true, traditional view of the terrain below, but also the borders of countries. The feature is particularly useful for seeing the outline of land despite cloudcover. It can also be used to show the location of lakes.

In the main image, the border between Egypt and Sudan is clearly visible as a horizontal line. The contours of Lake Nasser, which would otherwise be invisible except for its southern tip due to heavy cloud cover (see thumbnail image “Egypt, without borders” for a look at the original, borderless image), are easily distinguishable, highlighted in blue. The thumbnail image of Mozambique shows the country’s shoreline despite an area of convection, in this case a potential area of cyclone formation, looming over the coast. The thumbnail image of Bolivia and Peru focuses on Lake Titicaca, and clearly shows where the lake is divided between the two countries. The thumbnail image of southern USA, in addition to sediments from the Mississippi River, shows the border between Louisiana (right) and Texas (left), as well as the Toledo Bend Reservoir, despite the thick clouds covering the upper half of the image.

Salton Sea and von Kármán Vortex Street by Baja California, Mexico and USA

27.6N 110.8W

November 26th, 2012 Category: Clouds, Lakes

USA and Mexico – November 25th, 2012

Visible near the top edge of this image, in the upper left quadrant, is the Salton Sea, a large lake in southern California, USA. Continuing south through the green Imperial Valley, one comes to the mouth of the Colorado River in the Gulf of California (Sea of Cortez), by the start of the Baja California Peninsula.

West of the peninsula, in the lower left quadrant, a von Kármán Vortex Street can be seen in the clouds over the Pacific Ocean. The “street” is a repeating pattern of swirling vortices caused by the unsteady separation of flow of a fluid over bluff bodies – in this case, islands.

Smoke Over Lake Manitoba, Canada

50.6N 98.3W

September 13th, 2012 Category: Clouds, Fires, Lakes

Canada and USA – August 29th, 2012

Smoke from wildfires in Canada creates a thick cloud in the upper left corner of this image, covering Lake Manitoba. The smoke blows in a southeasterly direction, towards Lake Superior (right center) and Lake Michigan (right edge, below the former). A few contrails from passing airplanes can be observed cutting through the cloud of smoke.

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