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Archive for October 26th, 2009

Lake Balaton and the Mura River, Hungary

46.8N 17.7E

October 26th, 2009 Category: Lakes, Rivers

Hungary - September 24th, 2009

Hungary - September 24th, 2009

The waters of Hungary’s Lake Balaton, the largest lake in Central Europe, appear bright green due to silty sediments and algae. Here, the water along the western shores of the lake appears slightly lighter in color than that of the rest of the lake.

Several rivers and streams can also be seen flowing across the landscape, including the Mura River, a tributary of the Drava and subsequently the Danube. The Mura’s total length is 465 km, of which 295 km is in Austria, 98 km is in Slovenia and the rest forms the border between Croatia and Hungary.

Here, the river flows across the image from the center left,  appearing as a dark green line that forms the border between Hungary (above) and Croatia (below).

Sediments in Interconnected San Francisco Bays, California, USA – October 26th, 2009

37.7N 122.4W

October 26th, 2009 Category: Image of the day, Rivers

California, USA - August 25th, 2009

California, USA - August 25th, 2009

Sediments from the Sacramento and San Joaquin Rivers flow through a group of interconnected bays in California often collectively referred to as the San Francisco Bay, before spilling out into the Pacific Ocean.

Along this path, the sediments actually flow first into Suisun Bay, which then flows through the Carquinez Strait to meet with the Napa River at the entrance to San Pablo Bay, which in turn connects at its south end to the true San Francisco Bay.

The cities of this region, including San Francisco, Oakland and San Jose, can be seen as grey areas near and along the shores of the bays.

Niger Inland Delta During the Wet Season, Mali

October 26th, 2009 Category: Rivers

Mali - September 29th, 2009

Mali - September 29th, 2009

An expansive green area stands out in the midst of the arid tan Sahel (semi-arid tropical savanna and steppe ecoregion) in Mali. This large stretch of green is the Inland Niger Delta. The area of the delta, which is fed by floodwaters from the Niger River (top), the Bani River (bottom) and many smaller streams, changes greatly over the course of the year.

During the dry season, the delta may have a surface area of around only 3,900 square kilometers (1,500 square miles). However, during the rainy season, which starts in July and lasts four months, it can  grow to about 20,000 square kilometers (7,700 square miles). This image was taken at the end of September, three months into the wet season.

Tropical Storm Lupit (22W) to Complete Extratropical Transition Southeast of Tokyo, Japan

28.1N 131.4E

October 26th, 2009 Category: Tropical Storms

Typhoon Lupit Near Taiwan - October 25th, 2009

Typhoon Lupit Near Taiwan - October 25th, 2009

Track of Lupit - October 25th, 2009 © Univ. of Wisconsin

Track of Lupit

Enhanced image

Enhanced image

Lupit (22W) has been downgraded from a typhoon to a tropical storm. Now located approximately 200 nm east of Okinawa, Japan, the system has tracked northeastward at 18 knots over the past six hours.

Animated infrared imagery indicates 22W is starting to elongate to the northwest and that the deep convection has weakened and shifted to the northeast of the low level circulation center.

Additionally, Lupit is showing the signs of moderate to high vertical wind shear and PGTW has started to use the extratropical fix method, yielding a value of 45 knots.

Lupit has started to interact with the baroclinic zone, will continue to accelerate into the mid-latitudes, and will complete extratropical transition southeast of Tokyo, Japan, by TAU 24. Maximum significant wave height is 22 feet.