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Tropical Storm Dujuan Accelerates Northeastward

44.5N 156.0E

September 10th, 2009 Category: Tropical Storms

Tropical Storm Dujuan - September 9th, 2009

Tropical Storm Dujuan - September 9th, 2009

Enhanced image - September 9th, 2009

Enhanced image

Track of Dujuan - September 9th, 2009 © Univ. of Wisconsin

Track of Dujuan

Tropical Storm Dujuan (13W), located approximately 945 nautical miles south of Petropavlovsk, Russia, has tracked northeastward at 34 knots over the past six hours.

TS 13W continues to undergo extratropical transition as it accelerates to the northeast.  Here, convection associated with Dujuan is visible east of Japan. Maximum significant wave height is 19 feet.

The system has tracked over cooler waters (approximately 24ºC) and is forecast to continue tracking over increasingly unfavorable sea surface temperatures through out the forecast period.

Over the past six hours the system has continued to show signs of a warm anomaly in the upper levels, although this temperature anomaly has weakened slightly and lowered in the atmospheric column.

The system is forecast to complete extratropical transition by TAU 12 and maintain intensity as an extratropical system throughout the forecast period.

Tropical Storm Dujuan Tracks Northeastward

23.8N 134.2E

September 6th, 2009 Category: Tropical Storms

Tropical Storm Dujuan - September 5th, 2009

Tropical Storm Dujuan - September 5th, 2009

Enhanced image - September 5th, 2009

Enhanced image

Track of Dujuan - September 5th, 2009 © Univ. of Wisconsin

Track of Dujuan

Tropical Storm Dujuan (13W) is located approximately 430 nautical miles east-southeast of Okinawa, Japan. In the full image, the island nation of Japan can be seen to the north of the system.

Dujuan has tracked northeastward at 16 knots over the past six hours. The system has maximum sustained winds of 45 knots with higher gusts of up to 55 knots. Maximum significant wave height at is 25 feet.

Tropical Storm Dujuan South of Japan and Taiwan

20.6N 126.5E

September 5th, 2009 Category: Tropical Storms

Tropical Storm Dujuan - September 4th, 2009

Tropical Storm Dujuan - September 4th, 2009

Enhanced image - September 4th, 2009

Enhanced image

Track of Dujuan - September 4th, 2009 © Univ. of Wisconsin

Track of Dujuan

Tropical Storm Dujuan (13W) is located approximately 475 nautical miles south-southeast of Okinawa, Japan. Here, the southern tip of Taiwan can be seen in the top left corner, while most of the Philippines below are obscured by convection associated with the storm.

Dujuan has tracked northeastward at 13 knots over the past six hours. Maximum significant wave height is 20 feet.

Animated multispectral imagery shows deep,flaring convection starting to consolidate about a low level circulation center (LLCC). Synoptic analysis indicates that the system is located in an area of favorably low vertical wind shear under an anticyclone aloft. Additionally, animated water vapor imagery depicts excellent equatorward and poleward outflow.

TS 13W will continue to track northeastward under the steering influence of the westward building mid-level ridge located to the northeast. By TAU 48 the system will track more poleward as the ridge builds slightly northwestward and by TAU 72 Dujuan should start to crest the subtropical ridge axis and track more east-northeastward along the northwestern periphery of the ridge.

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