Tag Archives: Tropical Storm Etau

Typhoon Bang-lang Spins North of Wake Island

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Typhoon Bang-lang was spinning over the Western North Pacific Ocean north of Wake Island on Saturday morning.  At 5:00 a.m. EDT on Saturday the center of Typhoon Bang-lang was located at latitude 24.8°N and longitude 168.4°E which put the center about 335 miles (535 km) north-northeast of Wake Island.  Bang-lang was moving toward the north-northeast at 18 m.p.h. (30 km/h).  The maximum sustained wind speed was 85 m.p.h. (135 km/h) and there were wind gusts to 105 m.p.h. (165 km/h).  The minimum surface pressure was 971 mb.

Typhoon Bang-lang intensified during Friday night.  Thunderstorms were occurring in bands in the eastern and northern parts of Bang-lang’s circulation.  Bands in the southwestern part of Typhoon Bang-lang consisted primarily of showers and lower clouds.  Storms near the center of Bang-land generated upper level divergence that pumped mass away to the northeast of the typhoon.  The removal of mass caused the surface pressure to decrease.

The strongest winds were occurring in the eastern part of Typhoon Bang-lang.  Winds to typhoon force extended out 20 miles (30 km) in the eastern half of Bang-lang’s circulation.  Winds to tropical storm force extended out 80 miles (130 km) from the center of Typhoon Bang-lang.

Typhoon Bang-lang will move through an environment that will become unfavorable for intensification during the next 24 hours.  Bang-lang will move over water where the Sea Surface Temperatures are near 27°C.  It will move under the eastern side of an upper level trough that is east of Japan.  The upper level trough will produce southerly winds that will blow toward the top of Bang-lang’s circulation.  Those winds will cause the vertical wind shear to increase.  Typhoon Bang-lang will start to weaken when the vertical wind shear increases.  Bang-lang will move over colder water on Sunday.  It will start to weaken more quickly when it moves over the colder water.  Typhoon Bang-lang will also start to make a transition to an extratropical cyclone during the weekend because of the effects of the vertical wind shear and the colder water.

The upper level trough east of Japan will steer Typhoon Bang-lang toward the north during the next 24 hours.  On its anticipated track, Typhoon Bang-lang will move farther away from Wake Island.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Etau was north of Typhoon Bang-lang.  At 5:00 a.m. EDT on Saturday the center of Ttopical Storm Etau was located at latitude 28.7°N and longitude 165.6°E which put the center about 615 miles (995 km) north of Wake Island.  Etau was moving toward the north at 21 m.p.h. (33 km/h).  The maximum sustained wind speed was 45 m.p.h. (75 km/h) and there were wind gusts to 60 m.p.h. (95 km/h).  The minimum surface pressure was 991 mb.

Tropical Storm Saudel Brings Wind and Rain to Eastern China

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Tropical Storm Saudel brought wind and rain to eastern China on Thursday night.  At 11:00 p.m. EDT on Thursday the center of Tropical Storm Saudel was located at latitude 28.0°N and longitude 120.3°E which put the center about 25 miles (40 km) west of Wenzhou, China.  Saudel was moving toward the west at 16 m.p.h. (26 km/h).  The maximum sustained wind speed was 65 m.p.h. (105 km/h) and there were wind gusts to 80 m.p.h. (130 km/h).  The minimum surface pressure was 982 mb.

The center of Typhoon Saudel made landfall on the east coast of China east of Wenzhou on Thursday evening.  Saudel weakened to a tropical storm after it made landfall on the coast.

The circulation around Tropical Storm Saudel was still well organized.  Bands of showers and thunderstorms were revolving around the center of Saudel’s circulation.

Winds to tropical storm force extended out 155 miles (250 km) from the center of Tropical Storm Saudel.

Tropical Storm Saudel will move around the southern side of a high pressure system that is over the Western North Pacific Ocean and eastern China.  The high pressure system will steer Saudel toward the west during the next 24 hours.  On its anticipated track, Tropical Storm Saudel will move inland over Zhejiang.

Tropical Storm Saudel will bring strong winds and heavy rain to Zhejang while it moves farther inland.  Heavy rain is likely to cause floods in some locations.

Tropical Storm Saudel will also bring gusty winds locally heavy rain to southern parts of Anhui and northern sections of Jiangxi.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Etau formed north of Wake Island.

At 11:00 p.m. EDT on Thursday the center of Tropical Storm Etau was located at latitude 24.5°N and longitude 167.3°E which put the center about 335 miles (540 km) north of Wake Island.   Etau was moving toward the north-northwest at 13 m.p.h. (21 km/h).  The maximum sustained wind speed was 50 m.p.h. (80 km/h) and there were wind gusts to 65 m.p.h. (105 km/h).  The minimum surface pressure was 994 mb.

 

Tropical Storm Etau Nears Vietnam, Vamco Threatens Philippines

Tropical Storm Etau neared Vietnam on Monday and newly formed Tropical Storm Vamco threatened the Philippines. At 4:00 a.m. EST on Monday the center of Tropical Storm Etau was located at latitude 12.8°N and longitude 111.6°E which put it about 170 miles (280 km) east of Tuy Hoa, Vietnam. Etau was moving toward the west at 15 m.p.h. (24 km/h). The maximum sustained wind speed was 45 m.p.h. (75 km/h) and there were wind gusts to 60 m.p.h. (95 km/h). The minimum surface pressure was 995 mb.

The distribution of thunderstorms around Tropical Storm Etau was asymmetrical. Etau was moving under the southern part of an upper level ridge over eastern Asia. The ridge was producing easterly winds which were blowing toward the top of Etau. Those winds were causing moderate vertical wind shear. The shear was causing the stronger thunderstorms to occur in bands on the western side of Tropical Storm Etau. The bands in the eastern side of Etau consisted primarily of showers and lower clouds. Winds to tropical storm force extended out 150 miles (240 km) in the northern half of Tropical Storm Etau. Winds to tropical storm force only extended out 50 miles in the southern half of Etau.

Tropical Storm Etau will move south of a high pressure system over eastern Asia. The high will steer Etau toward the west during the next two days. On its anticipated track the center of Etau will make landfall in Vietnam near Tuy Hoa in about 12 hours.

Tropical Storm Etau will move through an environment that should allow it to maintain its intensity until it makes landfall in Vietnam. Etau will move over water where the Sea Surface Temperature is near 28°C. The upper level ridge over eastern Asia will continue to cause moderate vertical wind shear which will limit intensification.

Since the stronger thunderstorms are in the western half of Tropical Storm Etau, heavy rain will fall over central Vietnam before the center of Etau makes landfall. Etau will drop locally heavy rain over central Vietnam, northern Cambodia, southern Laos and northeastern Thailand. The ground is already saturated in that region and flash floods are likely.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Vamco developed east of the Philippines. At 4:00 a.m. EST on Monday the center of Tropical Storm Vamco was located at latitude 12.8°N and longitude 130.6°E which put it about 370 miles (605 km) east of Laoang, Philippines. Vamco was moving toward the northwest at 13 m.p.h. (20 km/h). The maximum sustained wind speed was 40 m.p.h. (65 km/h) and there were wind gusts to 50 m.p.h. (80 km/h). The minimum surface pressure was 1002 mb. Tropical Storm Vamco is forecast to move toward Luzon and to strengthen into a typhoon.

Tropical Storm Etau Develops and Heads Toward Japan

A center of circulation developed within a large area of thunderstorms a few hundred miles south of Japan and the system has been designated Tropical Storm Etau.  At 11:00 a.m. EDT on Monday the center of Tropical Storm Etau was located at latitude 25.3°N and longitude 138.5°E which put it about 720 miles (1160 km) south-southeast of Osaka, Japan.  Etau was moving toward the north at 11 m.p.h. (18 km/h).  The maximum sustained wind speed was 40 m.p.h. (65 km/h) and there were wind gusts to 50 m.p.h. (80 km/h).  The minimum surface pressure was 998 mb.

Although Tropical Storm Etau does have a low level center of circulation, most of the stronger thunderstorms are located north-northwest of the center.  Etau is moving over water where the Sea Surface Temperatures are warm enough to support intensification.  However, a large upper level trough west of Japan is producing southwesterly winds over the top of the tropical storm.  The circulation appears to be tilting toward the north with height because  of vertical wind shear.  Tilted tropical cyclones are unable to efficiently convert energy to wind speed and intensify.  Etau could intensify a little during the next 24 hours, but then it will run into much stronger upper level winds associated with the upper level trough.  Stronger vertical wind shear will cause Etau to begin to weaken before it reaches Japan.

A subtropical ridge east of Etau is steering it toward the north-northwest and that general motion is expected to continue for the next several days.  On its anticipated track Etau will approach the coast of Japan near Honshu and Shikoku.  Landfall somewhere between Nagoya and Kochi could occur in about 36 hours.  Etau’s biggest impact will be to increase rainfall as it moves inland.