8. Typhoon SANVU (Huaning/10w)                 Print this Article
>> August 9-14, 2005

Sanvu: contributed by Macao, is the Macanese word for coral, a hard substance often used for making jewelry, formed by the skeletons of tiny sea animals, massed together in great numbers. Many Macao souvenirs are made of it.

A. Storm Origins

At 1430 UTC 8 August, an area of convection, located approximately 365 nm northwest of Palau, was first mentioned as a suspect area in a STWO issued by JTWC. A 08/0904 UTC QuikScat pass indicated an elongated LLCC while animated enhanced infrared imagery depicted cycling convection on the periphery of this circulation. An upper-level analysis revealed a moderate vertical wind shear environment, weak divergence, and increasing 850-mb vorticity. The system gradually consolidated and a TCFA was issued at 10/0000 UTC. The first warning on Tropical Depression 10W was released at 10/1200 UTC, the centre being located approximately 500 nm east of Manila, Philippines. At this time TD-10W was well within PAGASA's AOR, that agency having already assigned the name Huaning from their internal naming list. Moving west-northwestward along the southern periphery of the subtropical ridge, TD-10W was upgraded to a tropical storm at 11/0000 UTC. Following JMA's upgrade to tropical storm intensity at 11/1200 UTC, the tropical cyclone was named Sanvu.

B. Track & Intensity History

With the subtropical ridge firmly in place across the northwest Pacific into eastern China, Tropical Storm Sanvu was foreordained to track on a predominantly west-northwesterly track. Sanvu/Huaning remained a weak tropical storm through 11 August while clipping the northeastern corner of Luzon, Philippines. Satellite images showed that the poleward outflow was being restricted due to subsidence associated with the ridging to the north. However, on 12 August Sanvu began to intensify and was upgraded to a 65-kt typhoon--its peak intensity--at 0000 UTC 13 August while located approximately 165 nm east of Hong Kong, China. By the time Sanvu made landfall near Shantou, China, at around 13/0600 UTC, it had weakened to a 55-kt tropical storm. As it was dissipating as a significant tropical cyclone over land, the final warning was issued by JTWC. JMA maintained Sanvu as a tropical storm until 14/0000 UTC when that agency also released the final statement.

A peak intensity of 60 kts was estimated by both NMCC and HKO while JMA and the Meteorological Department of Thailand estimated a MSW of 55 kts. The minimum CP estimated by JMA was 985 mb. The peak intensity estimated by the CWB of Taiwan was 50 kts, which was also the highest MSW per PAGASA's warnings while the storm was moving through their AOR.

A graphic displaying the track of Typhoon Sanvu/Huaning may be found at the following link: 2005_10W_SANVU.jpg

C. Damage & Casualties

Typhoon Sanvu brought strong winds and torrential rains to southern China. The winds brought down trees and sent billboards and telephone boxes flying while torrential rains brought tremendous flooding. The floodwaters destroyed more than 2,500 houses, many bridges, and damaged 60,000 hectares (148,000 acres) of crops. Two people were killed when a two-metre wall at a construction site collapsed.

D. Huang Chunliang Report from the Philippines

Rainfall observations--only 24-hr amount(s) >= 100 mm listed:

TUGUEGARAO (WMO98233, 19.62N/121.73E)         307.5 mm [11/00-12/00Z]
LAOAG (WMO98223, 18.18N/120.53E)              124.2 mm [11/00-12/00Z]
IBA (WMO98324, 15.33N/119.97E)                120.6 mm [11/00-12/00Z]
BAGUIO (WMO98328, 16.42N/120.60E)             105.4 mm [11/00-12/00Z]
SAN JOSE (WMO98531, 12.35N/121.03E)           103.6 mm [11/00-12/00Z]
CASIGURAN (WMO98336, 16.28N/122.12E)          101.4 mm [11/00-12/00Z]
SUBIC BAY WX STN (WMO98426, 14.80N/120.27E)   152.0 mm [12/00-13/00Z]
IBA (WMO98324, 15.33N/119.97E)                130.6 mm [12/00-13/00Z]
BAGUIO (WMO98328, 16.42N/120.60E)             118.0 mm [12/00-13/00Z]

E. Huang Chunliang Report from China

(Editor's Note: I have not yet received Chunliang's China report on Typhoon Sanvu. It will be included as an addendum to a future summary.)

(Report written/compiled by Kevin Boyle and Huang Chunliang)

Source: Gary Padgett's Monthly Tropical Cyclone Summary - August 2005

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