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Posts tagged 26S

Sofia and Betsiboka Rivers, Madagascar

April 30th, 2009 Category: Snapshots

Madagascar - April 8th, 2009

Madagascar - April 8th, 2009

Reddish sediments spill into the Mozambique Channel from the Sofia River (top right) and Betsiboka River (center) along Madagascar’s west coast.

The Betsiboka River discharges its sediments into the Bombetoka Bay, which then connects to the Mozambique Channel.

This discharge of reddish sediments is due to erosion caused by heavy deforestation in Madagascar. Here, the presence of Tropical Cyclone 26S (Jade) near the country’s east coast, also contributed to the high flow of sediments by provoking heavy rainfall.

Sediments off Coast of Madagascar’s Melaky Region

April 17th, 2009 Category: Snapshots

Madagascar - April 8th, 2009

Madagascar - April 8th, 2009

This image focuses on the Melaky region, in the Mahajanga Province of western Madagascar. It borders Boeny Region in the northeast, Betsiboka in the east, Bongolava in the southeast and Menabe in the south.

The capital of the region is Maintirano. The population was estimated to be 175,500 in 2004 within the area of 38,852 km2 (15,001 sq mi). Melaky has the smallest population and the smallest population density of all Malagasy regions.

Here, the region’s coastline is flanked by reddish sediments being discharged from many rivers into the Mozambique Channel. This high outflow of sediments was provoked by heavy rains from Tropical Cyclone 26s (Jade), which was located near the eastern coast of Madagascar at the time this image was captured.

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.

Tropical Cyclone 26S (Jade) Regains Strength

April 8th, 2009 Category: Tropical Cyclones

Tropical Cyclone 26S (Jade) - April 8th, 2009

Tropical Cyclone 26S (Jade) - April 8th, 2009

TC 26S - enhanced image

TC 26S - enhanced image

Track of TC 26S © Univ. of Wisconsin

Track of TC 26S

Tropical Cyclone 26s (Jade), located approximately 370 nautical miles west of La Reunion, has tracked southwestward at 5 knots over the past 6 hours. Maximum significant wave height is 13 feet.

Current intensity is based on satellite intensity estimates ranging from 35 to 55 knots from PGTW, KNES and FMEE. System intensity is limited by its proximity to land, with convection weak and flaring on the northern semicircle.

TC 26S is tracking southward along the western periphery of a meridionally oriented subtropical
ridge to the east. Jade is expected to reach the ridge axis near TAU 48 and subsequently begin turning to a more southeasterly track.

The cyclone is forecast to slowly intensify through TAU 36 before encountering increasing vertical wind shear, resulting in a weakening trend after TAU 48.