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Khotan River Formed by Confluence White Jade and Black Jade Rivers, China

37.1N 79.9E

May 17th, 2010 Category: Rivers

China - April 28th, 2010

China - April 28th, 2010

Here, the Khotan River can be seen flowing amongst the dunes of the Taklamakan Desert.  It is formed by the confluence of the White Jade (Yurungkash) and Black Jade (Karakash) Rivers, which unite towards the middle of the desert and the center of this ASAR image.

The confluence occurs some 145 kilometres (90 mi) north of the town of Khotan. The Khotan River (also referred to as the Hotan River or Ho-t’ien River) then flows 290 kilometres (180 mi) northwards across the desert and empties itself into the Tarim River.

The Jade Estuary and the Weser River, Germany

53.5N 8.1E

February 1st, 2010 Category: Rivers

Germany - December 31st, 2009

Germany - December 31st, 2009

The Jade Estuary, Jadebusen in German, is a bay on the North Sea coast of Germany. It was formerly known simply as Jade or Jahde. The Jade is a part of the German Wadden Sea National Parks. The port of Wilhelmshaven is on the western shore of the bay.

About 180 km² (70 mi²) in area, the Jade was largely created by storm floods during the twelfth and sixteenth centuries. During this period it was connected in the East to the river Weser (running from the bottom right corner towards the image center). This connection was closed between 1721 and 1725 by dikes reconnecting Butjadingen to the mainland as a peninsula.

In the West the Jade extended far into the Frisian peninsula. From the early sixteenth century a number of dikes were built against the storm floods and to arable land. The main dike, Ellenser Damm, was built between 1596 and 1615 based on an agreement between the principalities of East Frisia and Oldenburg.

The Weser River Between the Elbe and the Jade Estuary, Germany

53.0N 8.8E

November 15th, 2009 Category: Rivers

Germany - October 22nd, 2009

Germany - October 22nd, 2009

Flowing upwards from the bottom right, the Weser River empties into the North Sea off the coast of Germany. To its right is another rivermouth, that of the Elbe, and to its left is the Jade Estuary, a bay known as Jadebusen in German.

About 180 km² (70 mi²) in area, the Jade was largely created by storm floods during the twelfth and sixteenth centuries. During this period it was connected in the East to the river Weser. This connection was closed between 1721 and 1725 by dikes reconnecting Butjadingen to the mainland as a peninsula.

The 452 km long Weser River passes by the historic port city of Bremen before emptying into the North Sea 50 km further north at Bremerhaven, which is also a seaport. On the opposite (west) bank is the town of Nordenham at the foot of the Butjadingen Peninsula. It is the longest German river whose course lies entirely in German territory to reach the sea.

Tropical Cyclone 26S (Jade) Maintains Intensity

April 10th, 2009 Category: Tropical Cyclones

Tropical Cyclone 26S (Jade) - April 10th, 2009 © Univ. of Wisconsin

Tropical Cyclone 26S (Jade) - April 10th, 2009

TC 26S © JTWC

TC 26S

Tropical Cyclone 26S (Jade), located approximately 280 nautical miles west-southwest of La Reunion, has tracked southeastward at 5 knots over the past six hours. Maximum significant wave height is 16 feet.

TC 26S continues to track southeastward along the southwestern periphery of a subtropical ridge extension to the north and east of the cyclone.

The low level circulation center (LLCC) remains partially exposed, with persistent westerly vertical wind shear confining convective development to the eastern portion of the LLCC.

Despite strong vertical wind shear, Jade has maintained intensity over the past 6 hours under the influence of strong diffluence aloft.

During the forecast period, the system is expected to continue generally southeastward along the southwestern periphery of the current steering ridge and ahead of a developing
midlatitude trough to the southwest.

The cyclone will rapidly accelerate to the southeast and begin extratropical transition as it encounters the flow associated with the approaching midlatitude trough around TAU 24. Strong upper-level diffluence ahead of the trough will enable TC 26S to strengthen as it completes extratropical transition by TAU 36.

Tropical Cyclone 26S (Jade) Forecast to Weaken, then Regain Intensity

April 9th, 2009 Category: Tropical Cyclones

Tropical Cyclone 26S (Jade) - April 9th, 2009

Tropical Cyclone 26S (Jade) - April 9th, 2009

Track of TC 26S © Univ. of Wisconsin

Track of TC 26S

Tropical Cyclone 26s (Jade), located approximately 325 nautical miles west-southwest of La Reunion, has tracked east-southeastward at 2 knots over the past 6 hours. Maximum significant wave height is 16 feet.

TC 26S has weakened due to strong vertical wind shear over the past 12 hours. the majority of convection is being sheared to the east of the low level center.

An anticyclone south of the system is blocking any significant poleward motion. The dynamical aids almost uniformly predict a deep trough moving off the coast of South Africa after TAU 36. This trough is forecast to push the baroclinic zone further equatorward, break down the ridge, and ultimately capture TC 26S.

Jade is forecast to weaken below the 35-knot threshold near TAU 24, but will begin to re-intensify near TAU 48, as the the system begins to transition to extratropical.

TC 26S - enhanced image

TC 26S - enhanced image

The strong vorticity forecast with the trough supports an extra-tropical transition and reintensification scenario, which represents a change from the previous forecast.

Although the possibility still exists that TC 26S might completely dissipate before it can encounter the baroclinic zone, the models and synoptic evidence suggest otherwise.

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