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Tropical Storm Doksuri (07W) Near Philippines

18.8N 118.5E

June 29th, 2012 Category: Tropical Storms

Tropical Storm Doksuri – June 28th, 2012

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Track of TS 07W - June 28th, 2012 © Univ. of Wisconsin

Track of TS 07W

On June 21, a tropical disturbance formed east of Yap, and it developed multiple vortices.

Early on June 25, a vortex developed well within the low-pressure area, prompting the JMA considering it as a tropical depression north of Palau; also, the JTWC issued a TCFA on the system later that day.

On June 26, the PAGASA upgraded the system to a tropical depression and named it Dindo. Later that day, the JMA upgraded the system to a tropical storm and named it Doksuri, and the JTWC upgraded Doksuri to a tropical depression. Late on the same day, the JTWC upgraded Doksuri to a tropical storm.

On June 27, Doksuri’s low-level circulation center became exposed due to moderate easterly wind shear. On June 28, the JTWC downgraded Doksuri to a tropical depression, as the system’s exposed circulation center began to underwent a usual circulation center replacement cycle, which involves a circulation center to be replaced by another new circulation center. On June 29, the HKO issued the strong wind signal No.1 as it was located 120 kilometers from Hong Kong.

Tropical Storm Meari (07W), Philippines

16.8N 123.3E

June 24th, 2011 Category: Tropical Storms

Tropical Storm Meari (07W) - June 21st, 2011

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Track of TS 07W - June 23rd, 2010 © Univ. of Wisconsin

Track of TS 07W

Early on June 20, an area of low pressure about 760 km (470 miles), east of the Philippines began to be monitored by both the JTWC and JMA.

That evening, the JTWC issued a Tropical Cyclone Formation Alert. Soon afterwards, PAGASA upgraded the system into a tropical depression, naming it as “Falcon”. At the time of the upgrade, Falcon was located about 1000 km (620 miles), east northeast of Cebu City.

During the evening of June 21, the JTWC also reported that Falcon had strengthened into a tropical depression. On June 22, both the JTWC and the JMA upgraded Falcon into a tropical storm, and the JMA named it Meari.

Tropical Storm Meari (07W), located approximately 435 south-southwest of Kadena Air Base, Japan, has tracked north-northwestward at 14 knots over the past six hours. Numerous small-scale vortices continue to develop along and rotate around its periphery.

However, the center of the broader circulation has consolidated a bit over the past six hours and is therefore more readily identified than it was at the time this image was acquired. The current intensity estimate is 45 knots, and maximum significant wave height is 19 feet. The system is tracking poleward along the western periphery of a subtropical steering ridge to the east.

TS 07W will continue to track poleward along the western periphery of the current steering ridge
through the forecast period. moderate vertical wind shear and subsidence aloft introduced by interaction with an upper-level low will vie with strong equatorward outflow to limit the intensification rate for the next 36 hours. Between TAU 48 and TAU 72, the system will undergo extratropical transition and weaken under the influence of increasing vertical wind shear and passage over cooler water.

Typhoon Kompasu (08W) and Tropical Storms Namtheun and Lionrock

29.0N 129.6E

August 31st, 2010 Category: Tropical Cyclones, Tropical Storms

Typhoon Kompasu (08W) - August 30th, 2010

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Track of TY 08W - August 30th, 2010 © Univ. of Wisconsin

Track of TY 08W

Upon opening the full image, Typhoon Kompasu (08W) can be seen between Japan (north) and the Philippines (south). In the animated image, Kompasu is the system to the right, whose track is marked; also visible to the left in the full version are Tropical Storm Namtheun (09W) and Tropical Storm Lionrock (07W).

Typhoon Kompasu began as an area of low pressure that formed on August 27th, about 305 km (200 mi) to the east of the island of Yap. At that time, the system was disorganized due to high vertical wind shear.

The next day, the system started to move northwest and crossed the island of Guam. That evening, the system was located about 370 km (250 mi) northwest of Guam, in an area of low vertical windshear and a favorable environment. A Tropical Upper Tropospheric Trough (TUTT) was located to the east of the system. At that time, the Japanese Meteorological Agency upgraded the system into a tropical depression.

Around midday on August 29th, the Joint Typhoon Warning Centre (JTWC) issued a Tropical Cyclone Formation Alert (TCFA) on the system as the Low Level Circulation Center (LLCC) became more organized. On the morning of that same day, the JTWC announced that the system had quickly developed into a tropical storm and assigned the designation “08W”.

Intensification continued, and by midday on August 30th, the JMA reported that the depression had intensified into a tropical storm and assigned its international designation “Kompasu”. In addition, PAGASA also announced that the low pressure to the northeast of Batanes had formed, and assigned its local name: “Glenda”. Six hours later, the JMA reported that Kompasu had intensified rapidly into a severe tropical storm. At the same time, the JTWC also upgraded Kompasu to a category 1 typhoon.

Tropical Storm Lionrock (07W) Southeast of Hong Kong

18.7N 112.7E

August 29th, 2010 Category: Tropical Storms

Tropical Storm Lionrock (07W) - August 28th, 2010

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Track of TS 07W - August 28th, 2010 © Univ. of Wisconsin

Track of TS 07W

Tropical Storm Lionrock (07W), located approximately 215 nm southeast of Hong Kong, has tracked north-northwestward at 07 knots over the past six hours. Maximum significant wave height is 13 feet.

Animated infrared satellite imagery depicts a consolidating low-level circulation center (LLCC) with improved convective banding wrapping into the center. The main image shows the convection on the western side of the system.

Upper-level analysis indicates that vertical wind shear has decreased to 5-10 knots with improved poleward outflow enhanced by a trough over southeast China. The current intensity is based on Dvorak estimates of 35 knots.

Lionrock is forecast to track north-northwestward to northwestward through TAU 48 when it will make landfall. Then, the system should turn westward. It is forecast to intensify to a peak of 55-60 knots and should dissipate over land by TAU 96.

Tropical Storm 07W (Molave/Isang) Expected to Make Landfall Near Hong Kong This Weekend

20.6N 117.4E

July 18th, 2009 Category: Tropical Storms

Tropical Storm 07W - July 17th, 2009

Tropical Storm 07W - July 17th, 2009

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Track of TS 07W - July 17th, 2009 © Univ. of Wisconsin

Track of TS 07W

Tropical Storm Molave (07W), named Isang in the Philippines, is located approximately 305 nautical miles north-northeast of Manila, Philippines, has tracked northwestward at 10 knots over the past 6 hours. Maximum significant wave height is 14 feet.

TS07W continues tracking along the southwestern periphery of an extension of the subtropical ridge, located to its northeast. Multispectral imagery indicates that the low level circulation center (LLCC) has quickly become organized with tightly curved banding developing toward it.

As Molave tracks to the north of Luzon, the inflow of relatively drier air (apparent in total precipitable water products) has led to a decrease in deep convection on the southeastern periphery. However, this has been offset by increased deep convection on the northern periphery.

Upper level analysis still indicates strong equatorward outflow is present. Sea surface temperatures are favorable for development, and the ocean heat content (OHC) products indicate there is a large region of deep, warm water between Luzon and Taiwan helping to fuel a brief period of rapid development.

High pressure to the north and northeast of 07W will steer the storm into the South China Sea this weekend and will take aim at China. However, the OHC will decrease as TS07W tracks into the northern portion of the South China Sea and, in association with increased vertical wind shear, will begin to weaken. Molave is forecast to make landfall near Hong Kong around TAU 36 and quickly begin to dissipate, with full dissipation by TAU 72.

Before it reaches China, 07W will pass through the Luzon Strait Friday. Despite remaining over water, 07W will impact Luzon Island with locally heavy rains and strong, damaging wind gusts Friday. Rainfall amounts could exceed 5 inches (125 mm) in some areas, resulting in flash flooding and landslides. Wind gusts could be as high as 70 mph (115 kph) during the day as well.

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