Tag Archives: 05W

Tropical Storm Trases Develops over the East China Sea

Tropical Storm Trases developed over the East China Sea south of Jeju Island, South Korea on Sunday afternoon. At 2:00 p.m. EDT on Sunday the center of Tropical Storm Trases was located at latitude 30.1°N and longitude 126.3°E which put it about 175 miles (280 km) south of Jeju Island, South Korea. Trases was moving toward the north-northwest at 18 m.p.h. (29 km/h). The maximum sustained wind speed was 40 m.p.h. (65 km/h) and and there were wind gusts to 50 m.p.h. (80 km/h). The minimum surface pressure was 998 mb.

The circulation at the center of a large low pressure system over the East China Sea strengthened on Sunday afternoon and the Japan Meteorological Agency designated the system as Tropical Storm Trases. The distribution of thunderstorms around Tropical Storm Trases was asymmetrical. Thunderstorms were occurring in bands in the southern part of Trases’ circulation. Bands in the other part of the tropical storm consisted primarily of showers and lower clouds. The air in the northern part of Tropical Storm Trases was cooler and drier. The cooler, drier air was inhibiting the formation of thunderstorms in that part of Trases.

Tropical Storm Trases will move through an environment marginally favorable for intensification during the next 12 hours. Trases will will move over water where the Sea Surface Temperatures are near 26˚C. It will move under the axis of an upper level ridge centered north of Japan. The upper level winds are weak near the axis of the ridge and there will be little vertical wind shear. However, the cooler drier air on the northern side of Trases will limit the potential for intensification. Tropical Storm Trases could intensify a little during the next 12 hours. Trases will move over cooler water on Monday and it is likely to weaken at that time.

Tropical storm Trases will move around the western side of a high pressure system over the Western North Pacific Ocean. The high pressure system will steer Trases toward the north during the next 24 hours. On its anticipated track the center of Tropical Storm Trases could reach Jeju Island within 12 hours. Trases could make landfall on the west coast of South Korea on Monday. Tropical Storm Trases will bring gusty winds and locally heavy rain to parts of South Korea.

Typhoon Chaba Hits Southern China

Typhoon Chaba hit southern China on Saturday morning. At 5:00 a.m. EDT on Saturday the center of Typhoon Chaba was located at latitude 21.5°N and longitude 111.0°E which put it about 25 miles (40 km) east of Wuchuan, China. Chaba was moving toward the north-northwest at 8 m.p.h. (13 km/h). The maximum sustained wind speed was 80 m.p.h. (130 km/h) and and there were wind gusts to 95 m.p.h. (150 km/h). The minimum surface pressure was 978 mb.

The center of Typhoon Chaba made landfall on the south coast of China near Wuchuan and Dianbai in Guangdong on Saturday morning. Typhoon Chaba was strengthening when it made landfall. A small circular eye was as the center of Chaba’s circulation. Winds to typhoon force extended out 60 miles (95 km) from the center of Chaba. Winds to tropical storm force extended out 190 miles (305 km) from the center of circulation.

Typhoon Chaba will move around the western end of a high pressure system over the Western North Pacific Ocean. The high pressure system will steer Chaba toward the north-northwest during the next 24 hours. On its anticipated track Typhoon Chaba will move inland over southern China. Chaba will weaken gradually as it moves inland. Typhoon Chaba will bring strong winds and locally heavy rain to southwestern Guangdong. Heavy rain could cause flash floods in some locations. There were reports a ship broke in two in heavy seas in the South China Sea.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Aere brought gusty winds and heavy rain to the center Ryukyu Islands. At 5:00 p.m. EDT on Saturday the center of Tropical Storm Aere was located at latitude 26.3°N and longitude 129.1°E which put it about 115 miles (185 km) east-southeast of Okinawa. Aere was moving toward the north-northwest at 17 m.p.h. (19 km/h). The maximum sustained wind speed was 50 m.p.h. (80 km/h) and and there were wind gusts to 65 m.p.h. (105 km/h). The minimum surface pressure was 994 mb.

Chaba Strengthens to a Typhoon Northeast of Hainan

Former Tropical Storm Chaba strengthened to a typhoon northeast of Hainan Island on Friday afternoon. At 5:00 p.m. EDT on Friday the center of Typhoon Chaba was located at latitude 20.4°N and longitude 111.8°E which put it about 100 miles (160 km) southeast of Wuchuan, China. Chaba was moving toward the northwest at 12 m.p.h. (19 km/h). The maximum sustained wind speed was 75 m.p.h. (120 km/h) and and there were wind gusts to 90 m.p.h. (145 km/h). The minimum surface pressure was 981 mb.

Former Tropical Storm Chaba strengthened to a typhoon over the warm water in the northern South China Sea on Friday afternoon. The inner end of a rainband wrapped around the center of Typhoon Chaba’s circulation and the strongest winds were occurring in a ring around the center. Bands of showers and thunderstorms were revolving around the core of Typhoon Chaba. Storms near the core generated upper level divergence that pumped mass away from the typhoon. Winds to typhoon force extended out 60 miles (95 km) from the center of Chaba. Winds to tropical storm force extended out 180 miles (290 km) from the center of circulation.

Typhoon Chaba will move through an environment favorable for intensification during the next 12 hours. Chaba will move over water where the Sea Surface Temperatures are near 29˚C. It will move under the middle of an upper level ridge over the northern part of the South China Sea. The upper level winds are weak near the center of the ridge and there will be little vertical wind shear. Typhoon Chaba could continue to intensify during the next 12 hours.

Typhoon Chaba will move around the western end of a high pressure system over the Western North Pacific Ocean during the next 24 hours. The high will steer Chaba toward the northwest. On its anticipated track the center of Typhoon Chaba could make landfall on the coast of southern China near Wuchuan in 12 hours. Chaba will bring strong winds and locally heavy rain to southwestern Guangdong. Heavy rain is likely to cause flash floods in some locations.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Aere intensified gradually southeast of Okinawa. At 5:00 p.m. EDT on Friday the center of Tropical Storm Aere was located at latitude 23.6°N and longitude 130.4°E which put it about 305 miles (495 km) southeast of Okinawa. Aere was moving toward the north-northwest at 12 m.p.h. (19 km/h). The maximum sustained wind speed was 50 m.p.h. (80 km/h) and and there were wind gusts to 65 m.p.h. (105 km/h). The minimum surface pressure was 994 mb. Tropical Storm Aere is forecast to move toward the north-northwest and to continue to strengthen gradually. Aere could be near Okinawa in 18 hours.

Tropical Storm Chaba Strengthens South of Hong Kong

Tropical Storm Chaba strengthened over the South China Sea south of Hong Kong on Thursday night. At 11:00 p.m. EDT on Thursday the center of Tropical Storm Chaba was located at latitude 18.6°N and longitude 113.7°E which put it about 275 miles (445 km) south of Hong Kong, China. Chaba was moving toward the northwest at 10 m.p.h. (16 km/h). The maximum sustained wind speed was 60 m.p.h. (95 km/h) and and there were wind gusts to 75 m.p.h. (120 km/h). The minimum surface pressure was 991 mb.

Tropical Storm Chaba strengthened south of Hong Kong on Thursday night. The inner end of a rainband wrapped around most of the center of circulation. The strongest winds were occurring in the part of the rainband wrapped around the center. Bands of thunderstorms were occurring in the southern half of Chaba’s circulation. Bands in the northern half of Chaba contained more showers and lower clouds. Storms near the center of circulation pumped mass away to the south and west of the tropical storm. Winds to tropical storm force extended out 140 miles (225 km) from the center.

Tropical Storm Chaba will move through an environment favorable for intensification during the 24 hours. Chaba will move over water where the Sea Surface Temperatures are near 29˚C. It will move under the middle of an upper level ridge over the northern part of the South China Sea. The upper level winds are weak near the center of the ridge and there will be little vertical wind shear. Tropical Storm Chaba will continue to intensify during the next 24 hours and it could strengthen to a typhoon.

Tropical Storm Chaba will move around the western end of a high pressure system over the Western North Pacific Ocean during the next 24 hours. The high will steer Chaba toward the northwest. On its anticipated track the center of Tropical Storm Chaba could be near the northeastern part of Hainan Island in 18 hours. Chaba could approach the coast of southern China near Zhanjiang in 24 hours. Chaba could be a typhoon when it approaches southern China. It will bring strong winds and locally heavy rain. Heavy rain is likely to cause flash floods in some locations.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Aere formed south-southeast of Okinawa. At 11:00 p.m. EDT on Thursday the center of Tropical Storm Aere was located at latitude 20.8°N and longitude 130.8°E which put it about 470 miles (760 km) south-southeast of Okinawa. Aere was moving toward the east-northeast at 9 m.p.h. (15 km/h). The maximum sustained wind speed was 40 m.p.h. (65 km/h) and and there were wind gusts to 50 m.p.h. (80 km/h). The minimum surface pressure was 1000 mb. Tropical Storm Aere is forecast to move toward the north-northwest and to strengthen gradually. Aere could be near Okinawa in 36 hours.

Tropical Storm Koguma Nears Vietnam

The center of Tropical Storm Koguma moved closer to northern Vietnam on Saturday. At 11:00 a.m. EDT on Saturday the center of Tropical Storm Koguma was located at latitude 20.2°N and longitude 106.9°E which put it about 115 miles (185 km) southeast of Hanoi, Vietnam. Koguma was moving toward the northwest at 20 m.p.h. (32 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 997 mb.

The circulation around former Tropical Depression 05W strengthened slightly on Saturday and the system was upgraded to Tropical Storm Koguma. Even though the circulation around the former tropical depression was a little stronger, the distribution of thunderstorms around Tropical Storm Koguma was still asymmetrical. The strongest thunderstorms were occurring in bands southwest of the center of Koguma. Bands in the other parts of the tropical storm consisted primarily of showers and lower clouds. An upper level ridge centered over southern China was producing moderate northeasterly winds that were blowing toward the top of the depression. Those winds were causing moderate vertical wind shear and they were also causing the asymmetrical distribution of thunderstorms.

Tropical Storm Koguma will move into an environment only marginally favorable for intensification during the next few hours. Koguma will move over an area where the Sea Surface Temperatures are near 30°C. However, the upper level ridge over southern China will continue to produce moderate vertical wind shear. The moderate wind shear will keep Tropical Storm Koguma from strengthening significantly before it reaches Vietnam. The circulation around Koguma will weaken after the center moves over Vietnam.

Tropical Storm Koguma will move around the southern part of a subtropical high pressure system over the Western North Pacific Ocean during the next 24 hours. The high pressure system will steer Koguma toward the northwest. On its anticipated track the center of Tropical Storm Koguma will make landfall on the coast of northern Vietnam south of Haiphong in a few hours. Koguma will bring gusty winds to parts of northern Vietnam. Since the heaviest rain is falling southwest of the center of Tropical Storm Koguma, heavy rain is already falling over parts of northern Vietnam, northern Laos and extreme northeastern Thailand. The heavy rain could cause flash floods in some locations.

Tropical Depression Forms South of Hainan Island

A tropical depression formed just to the south of Hainan Island on Friday night. At 11:00 p.m. EDT on Friday the center of Tropical Depression 05W was located at latitude 18.3°N and longitude 109.5°E which put it about 35 miles (55 km) south of Sanya, China. The depression was moving toward the west at 16 m.p.h. (26 km/h). The maximum sustained wind speed was 35 m.p.h. (55 km/h) and there were wind gusts to 45 m.p.h. (75 km/h). The minimum surface pressure was 1000 mb.

Thunderstorms developed closer to the center of a low pressure system south of Hainan Island on Friday night and both the Japan Meteorological Agency and the Joint Typhoon Warning Center designated the system as a tropical depression. The distribution of thunderstorms around Tropical Depression 05W was asymmetrical. The strongest thunderstorms were occurring in bands southwest of the center of the tropical depression. Bands in the other parts of the circulation consisted primarily of showers and lower clouds. An upper level ridge centered over southern China was producing moderate northeasterly winds that were blowing toward the top of the depression. Those winds were causing moderate vertical wind shear and they were also causing the asymmetrical distribution of thunderstorms.

The center of Tropical Depression 05W will move near Hainan Island during the next few hours. The northern half of the circulation around the tropical depression will be over Hainan Island, which will inhibit intensification. Tropical Depression 05W will move into an environment favorable for intensification when it moves west of Hainan Island. The tropical depression will move over an area where the Sea Surface Temperatures are near 30°C. The upper level ridge over southern China will continue to produce moderate vertical wind shear. Even with the moderate wind shear, Tropical Depression 05W is likely to intensify to a tropical storm during the next 24 hours.

Tropical Depression 05W will move around the southern part of a subtropical high pressure system over the Western North Pacific Ocean during the next 36 hours. The high pressure system will steer the tropical depression toward the west-northwest. On its anticipated track the center of Tropical Depression 05W will pass near the southern part of Hainan Island. Since the strongest thunderstorms are in the southwestern part of the circulation, the tropical depression will cause mainly gustier winds over Hainan Island. Tropical Depression 05W could approach northern Vietnam in 24 hours. It could bring gusty winds and locally heavy rain to parts of northern Vietnam. Heavy rain could cause flash floods in some locations.

Tropical Storm Jangmi Forms South of Ryukyu Islands

Tropical Storm Jangmi formed south of the Ryukyu Islands on Saturday.  At 5:00 p.m. EDT on Saturday the center of Tropical Storm Jangmi was located at latitude 22.4°N and longitude 126.3°E which put it about 375 miles (605 km) south-southwest of Okinawa.  Jangmi was moving toward the north at 21 m.p.h. (34 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 998 mb.

A low pressure system east of Taiwan and south of the Ryukyu Islands strengthened on Saturday and the Japan Meteorological Agency designated the system as Tropical Storm Jangmi.  The distribution of  thunderstorms around Jangmi was asymmetrical.  Thunderstorms were occurring in bands in the eastern half of the tropical storm.  Bands in the western half of the circulation consisted primarily of showers and lower clouds.  Winds to tropical storm force extended out 200 miles (325 km) on the eastern side of Tropical Storm Jangmi.

Tropical Storm Jangmi will move through an environment somewhat favorable for intensification during the next 24 hours.  Jangmi will move over water where the Sea Surface Temperature is near 29°C.  It will move under the western side of an upper level ridge northeast of the Philippines.  The ridge will produce southerly winds which will blow toward the top of the tropical storm.  Those winds will cause moderate vertical wind shear which will inhibit intensification.  Tropical Storm Jangmi could strengthen on Sunday despite the vertical wind shear.

Tropical Storm Jangmi will move around the western end of a subtropical high pressure system over the Western North Pacific Ocean.  The high will steer Jangmi toward the north during the next 36 hours.  On its anticipated tack the center of Tropical Storm Jangmi will pass west of Okinawa in 12 to 18 hours.  Jangmi will bring gusty winds and locally heavy rain to Okinawa.  Tropical Storm Jangmi could approach South Korea in 36 hours.

Tropical Storm Maliksi Forms East of Luzon, Ewiniar Brings Rain to South China.

Tropical Storm Maliksi formed east of Luzon on Thursday while Tropical Storm Ewiniar brought rain to parts of South China.  At 8:00 p.m. EDT on Thursday the center of Tropical Storm Maliksi was located at latitude 17.4°N and longitude 127.7°E which put it about 330 miles (535 km) east of Luzon.  Maliksi was moving toward the north at 4 m.p.h. (6 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 996 mb.

The Japan Meteorological Agency designated an area of low pressure east of Luzon as Tropical Storm Maliksi late on Thursday.  There was a large counterclockwise circulation east of Luzon, but there were few thunderstorms near the center of the circulation.  Most of the thunderstorms were occurring in three bands in the outer portions of the circulation.  One band was located well to the west of the center of circulation, a second band was located well to the north of the center and the third band was located well to the east of the center.  The winds to tropical storm force were occurring in those bands.

Tropical Storm Maliksi will move through an environment favorable for intensification during the next 24 to 48 hours.  Maliksi will move over water where the Sea Surface Temperature is near 30°C.  Maliksi will move underneath an upper level ridge where the winds are weak and there will be little vertical wind shear.  The large circulation will be the primary factor inhibiting intensification in the short term.  Maliksi will intensify slowly until thunderstorms develop near the center of circulation and the strongest winds occur closer to the center.

Tropical Storm Maliksi will move around the western end of a subtropical ridge.  The ridge will steer Maliksi slowly toward the north.  When Tropical Storm Maliksi moves farther to the north westerly winds will begin to steer it toward the northeast.  On its anticipated track Tropical Storm Maliksi will remain east of Luzon.  The circulation of Maliksi is so large that rainbands on the western side of the circulation could affect the northern Philippines.

Elsewhere over the western North Pacific Ocean, Tropical Storm Ewiniar brought heavy rain to parts of South China.  Ewiniar made landfall on the coast of China near Yangjiang on Thursday.  At 8:00 p.m. EDT on Thursday the center of Tropical Storm Ewiniar was located at latitude 22.6°N and longitude 112.1°E which put it about 50 miles (80 km) northeast of Yangjiang, China.  Ewiniar was moving toward the north at 9 m.p.h. (15 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.

The center of Tropical Storm Ewiniar was moving farther inland over South China.  The winds to tropical storm force were occurring in rainbands that were still over the South China Sea.  Ewiniar was dropping heavy rain over parts of western Guangdong province and over southern Zizhiqu province.  The heavy rain could cause flooding in those areas.

Tropical Storm Ewiniar Forms Near Coast of South China

Tropical Storm Ewiniar formed near the coast of South China late on Tuesday.  At 11:00 p.m. EDT on Monday the center of Tropical Storm Ewiniar was located at latitude 20.9°N and longitude 110.5°E which put it about 50 miles (80 km) southeast of Zhanjiang, China.  Ewiniar was moving toward the northwest at 6 m.p.h. (10 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 1000 mb.

A distinct low level center of circulation consolidated in a cluster of showers and thunderstorms moving over the South China Sea near Hainan Island on Monday and the Japan Meteorological Agency designated the system as Tropical Storm Ewiniar.  Several bands of showers and thunderstorms developed west of the center of circulation.  Bands east of the center consisted primarily of showers and low clouds.  Winds to tropical storm force were occurring within 60 miles (95 km) of the center o circulation.

Tropical Storm Ewiniar has 12 to 24 hours during which it could intensify if the center remains over water.  The Sea Surface Temperature of the water near the coast of South China is about 30°C.  Ewiniar is under the southwestern portion of a narrow upper level ridge.  The ridge is producing weak southerly winds which are blowing toward the top of the circulation.  Those winds will cause some vertical wind shear but the shear will not be strong enough to prevent intensification.  Even though the atmospheric and oceanic environments are favorable for intensification, a portion of the circulation of Tropical Storm Ewiniar is already over land.  The friction caused by the flow of air over the land will inhibit intensification.  Tropical Storm Ewiniar could intensify a little more if the center remains over water.

The upper level ridge was steering Tropical Storm Ewiniar toward the northwest.  A general motion toward the north is expected for the next 24 to 48 hours.  On its anticipated track the center of Tropical Storm Ewiniar will move near the east coast of the Leizhou Peninsula.  Ewiniar could move inland near Wuchuan and Dianbai.  Tropical Storm Ewiniar will bring some gust winds to South China, but the greater risks are the potential for heavy rain and floods.

Tropical Storm Nanmadol Nearing Kyushu

Tropical Storm Nanmadol was quickly nearing Kyushu on Monday.  At 1:00 p.m. EDT on Monday the center of Tropical Storm Nanmadol was located at latitude 31.0°N and longitude 127.4°E which put it about 215 miles (345 km) southwest of Sasebo, Japan.  Nanmadol was moving toward the north-northeast at 24 m.p.h. (39 km/h).  The maximum sustained wind speed was 70 m.p.h. (110 km/h) and there were wind gusts to 85 m.p.h. (135 km/h).  The minimum surface pressure was 986 mb.

The structure of Tropical Storm Nanmadol was still consistent with its designation of a tropical cyclone, but there were signs that it could be about to start the transition to an extratropical cyclone.  There was a core of thunderstorms around the center of circulation.  The strongest winds were occurring in the inner core which extended out about 25 miles (40 km) from the center.  Several rainbands were on the eastern side of the circulation.  There were far fewer showers and thunderstorms in the western half of the circulation.  There were some indications that Nanmadol could be pulling cooler, drier, more stable air into the western side of the tropical storm.

Tropical Storm Nanmadol has probably reached its maximum intensity and it is likely to weaken during the next two days.  Nanmadol is currently over water where the Sea Surface Temperature is near 27°C.  However, it has reached the upper level westerly in the middle latitudes and the vertical wind shear is increasing.  Nanmadol will weaken faster when it moves across Japan.

The westerly winds in the middle latitudes have turned Tropical Storm Nanmadol toward the north-northeast.  As Nanmadol moves farther north, the speed of the westerlies will increase and the tropical storm is forecast to move quickly toward the east-northeast across southern Japan.  On its anticipated track, Tropical Storm Nanmadol will reach Kyushu in a few hours.  Nanmadol will also move over Shikoku and Honshu.  Tropical Storm Nanmadol will bring a brief period of gusty winds and the potential for locally heavy rain when it moves across southern Japan.