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Archive for November 17th, 2009

Tropical Cyclone Anja (01S) East-Northeast of La Reunion

16.1S 66.0E

November 17th, 2009 Category: Tropical Cyclones

Tropical Cyclone Anja - November 16th, 2009

Tropical Cyclone Anja - November 16th, 2009

Track of TC 01S - November 10th, 2009 © Univ. of Wisconsin

Track of TC 01S

Enhanced image

Enhanced image

Tropical Cyclone Anja (01S), located approximately 715 nm east-northeast of La Reunion, has tracked south-southwestward at 11 knots over the past six hours. Maximum significant wave height is 26 feet.

Animated infrared imagery shows Anja has maintained a small (just over 60 nm in diameter) but compact symmetry with annular characteristics.

The cyclone is being steered along the western boundary of a deep-layered subtropical ridge to the east. Upper level analysis indicates the system is directly under the ridge axis in a zone of low vertical wind shear. Animated water vapor imagery shows good radial outflow overhead.

TC 01S is expected to maintain its current intensity over the next 12 hours as it crests the western edge of the steering ridge. After TAU 12, it will begin to track over colder water and shift to a more southeastward track. This transition is in response to the approach of a mid latitude trough from the southwest.

At this stage, Anja will also begin to rapidly weaken and accelerate southeastward as it gets exposed to the strong westerly vertical wind shear. This will coincide with the cyclone’s transition into an extra tropical (ET) system with full ET status by TAU 72. The available numeric guidance is in close agreement with this track forecast with the sole exception of GFS that is significantly right of the envelope from TAU 12.

Sediments in the Gulf of Mexico Near Houston, Texas – November 17th, 2009

29.7N 95.3W

November 17th, 2009 Category: Image of the day, Lakes, Rivers

USA - November 10th, 2009

USA - November 10th, 2009

Louisiana Lakes and Bays

Louisiana Lakes and Bays

Houston, Texas

Houston, Texas

The waters in the Gulf of Mexico off the coasts of Texas (to the west) and Louisiana (to the east), USA, are laden with sediments. Those in bays and released from rivers by the Louisiana shores are a thick, muddy brown, while those flanking the Texas shoreline are diluted to a greener hue.

The first close-up focuses on the city of Houston, the largest city within the state of Texas. The city, most of which is situated on the gulf coastal plain, is connected to a large bay to the southeast. This bay is divided into three sections: Trinity Bay (north), East Bay (east) and Galveston Bay (south). Here, the bay is mostly colored light brown from sediments, which can then be sen spilling out into the Gulf.

The second close-up depicts a series of lakes and bays  filled with dark brown sediments along the Louisiana coastline. These are, from left to right, Sabine Lake, Calcasieu Lake, Grand Lake, White Lake, Vermilion  Bay and West Cote Blanche Bay.

Southern Italy, Between the Tyrrhenian and Adriatic Seas and the Gulf of Taranto

40.4N 16.4E

November 17th, 2009 Category: Lakes

Italy - October 7th, 2009

Italy - October 7th, 2009

The terrain of southern Italy appears divided in two, between the flatter lands near the Adriatic Coast (above) and the more mountainous terrain towards Tyrrhenian Sea (below).

Upon opening the full image, many cities and towns in the Apulia region appear as tan circular areas on the flatter Adriatic side. The main exception to this generally plain-like topography is the Gargano Peninsula (top left corner), home to Monte Gargano.

Also of note on the peninsula are Lake Lesina  (left) and Lake Varano (right), both dark green, separated from the Adriatic by a thin strip of land and dunes. Sediments line the coast of the peninsula, particularly to the right. Other swirls of sediments are also visible in the full image along the shores of the Gulf of Taranto (right).

Continuing to the right along the shoreline, towns cities such as Bari appear as tan patches amidst the green terrain. On the bottom right, by Apulia’s border with the Basilicata Region, the Basento River spills tan sediments into the Gulf of Taranto.

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Lake Balqash, the Qapshaghay Bogeni Reservoir and Lake Issyk Kul

46.2N 74.3E

November 17th, 2009 Category: Lakes, Rivers

Kazakhstan - October 5th, 2009

Kazakhstan - October 5th, 2009

Lake Balqash (center) and the smaller Qapshaghay Bogeni Reservoir, both in southeastern Kazakhstan, and the deep Lake Issyk Kul, in Kyrgyzstan, show varying shades of blue waters.

The waters of Lake Balqash appear turquoise to the east and a slightly lighter blue with a tan tint to the west. This difference could be from sediments draining into the lake from the Ili River (visible at the western end of the lake along the eastern shores), from differences in depth, or from differences in salinity, as the eastern half of the lake is salty while its western half is fresh.

Further south, the Qapshaghay Bogeni Reservoir also has a turquoise color. The Tian Shan Mountains to its south, crested with snow, mark the border between Kazakhstan and Kyrgyzstan. South of the first ridge is Lake Issyk Kul , which is deeper and darker blue than its neighbors.