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Tropical Cyclone Laurence (06S) Makes Landfall in Australia

14.2S 128.8E

December 15th, 2009 Category: Tropical Storms

Tropical Cyclone Laurence (06S) - December 13th, 2009

Tropical Cyclone Laurence (06S) - December 13th, 2009

Track of TC 06S - December 14th, 2009 © Univ. of Wisconsin

Track of TC 06S

Enhanced image

Enhanced image

Tropical Cyclone Laurence (06S) tracked through Darwin Australia this weekend before sliding back into the Timor Sea and is now forecast to make a second landfall in Australia. The storm is forecast to make landfall north of Wyndham in the Kimberley region, then parallel the coastline while moving over land for the next couple of days, heading southwest through the northern area of the Great Sandy Desert and into the Pilbara region.

Laurence is currently located approximately 250 nautical miles west-southwest of Darwin, Australia, and has tracked westward along the northwestern periphery of the mid-level subtropical steering ridge at 6 knots over the past six hours. Maximum significant wave height is 14 feet.

Upper-level analysis indicates the system is near the subtropical ridge axis and animated water vapor imagery shows good poleward and equatorward outflow. Accordingly, the system has intensified over the last 6 to 12 hours and an AMSR-E microwave image shows tightly wrapped banding and a microwave eye. Wyndham radar imagery also shows the wrapping convection and apparent low level circulation center, confirming the position.

TC 06S is expected to continue tracking generally west-southwestward along the northwestern coast of Australia throughout the forecast period. In the near term, an approaching mid-latitude trough will pass to the south but enable the steering ridge to remain oriented north-south, allowing the system to begin tracking south-southwestward over the next 24 hours.

By TAU 48, however, the system should weaken slightly as it interacts over land and it will turn more westward as a lobe of the steering ridge builds more southwestward. After TAU 96, the system should track back over very warm water and begin to re-intensify under favorable environmental conditions.

Lake Argyle on the Kimberley Plateau, Australia

16.1S 128.7E

December 2nd, 2009 Category: Lakes, Rivers

Australia - November 24th, 2009

Australia - November 24th, 2009

Lake Argyle is Australia’s second largest artificial lake by volume. It is part of the Ord River Irrigation Scheme and is located near the East Kimberley town of Kununurra in Western Australia. The primary inflow is the Ord River, while the Bow River and many other smaller creeks also flow into the dam.

The lake filled to capacity in 1973, flooding large parts of the Shire of Wyndham-East Kimberley on the Kimberley Plateau, about eighty kilometres inland from the Joseph Bonaparte Gulf, close to the border with the Northern Territory.

Lake Argyle normally has a surface area of about 1,000 square kilometres. The storage capacity, to the top of the spillway is 10,763,000 megalitres. Lake Argyle’s usual storage volume is 5,797,000 megalitres, making it the second largest reservoir in Australia. At maximum flood level, the lake would hold 35 million megalitres of water and cover a surface area of 2,072 square kilometres.

Tropical Cyclone 05S (Billy) Makes Landfall Over Australia

December 19th, 2008 Category: Tropical Cyclones

Tropical Cyclone 05S (Billy) - December 19th, 2008

Tropical Cyclone 05S (Billy) - December 19th, 2008

Tropical Cyclone 05S - enhanced image

Tropical Cyclone 05S - enhanced image

Tropical Cyclone 05S (Billy), located approximately 175 nautical miles southwest of Darwin, Australia, has remained quasi stationary over the past 6 hours.

It has meandered around the southern Joseph Bonaparte Gulf, causing abnormally high tides and flooding, during the past 12 hours as the primary steering influence shifts from a near equatorial ridge to the northeast, to a subtropical ridge building along the poleward side of the system.

The cyclone will soon begin to accelerate westward as this subtropical ridging builds.

Recent animated multispectral and water vapor satellite imagery and radar data from Wyndham show a marked increase in deep convection and improved organization of the low level circulation center.

Favorable poleward outflow and passage over favorable warm water will allow the current intensification trend to continue prior to landfall.

However, the rate of intensification will likely be limited by land interaction along the western and southern peripheries of the low level circulation center.

Tropical Cyclone 05S - multispectral satellite imagery © JTWC

Tropical Cyclone 05S - multispectral satellite imagery © JTWC

As the cyclone moves inland after Tau 12, steady dissipation will occur.

Maximum significant wave height is 10 feet.

source JTWC