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Tropical Storm Ampil Forms South of Japan

Tropical Storm Ampil formed over the Western North Pacific Ocean south of Japan on Monday afternoon.  At 5:00 p.m. EDT on Monday the center of Tropical Storm Ampil was located at latitude 24.7°N and longitude 138.1°E which put the center about 760 miles (1225 km) south of Tokyo, Japan.  Ampil was moving toward the northeast at 12 m.p.h. (19 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 992 mb.

A low pressure system over the Western North Pacific Ocean south of Japan strengthened on Monday afternoon and the Japan Meteorological Agency designated the system as Tropical Storm Ampil.  More thunderstorms developed near the center of Ampil’s circulation.  The inner end of a rainband wrapped part of the way around the center of Tropical Storm Ampil.  Other bands of showers and thunderstorms were revolving around the center of circulation.  Storms near the center generated upper level divergence that pumped mass away from the tropical storm.  The removal of mass caused the surface pressure to decrease.

Tropical Storm Ampil will move through an environment favorable for intensification during the next 24 hours.  Ampil will move over water where the Sea Surface Temperatures are near 30°C.  It will move under a small upper level ridge that is in between and upper level low southwest of Japan and an upper level low east of Japan.  The upper level winds are weak in the small ridge and there will be little vertical wind shear.  Tropical Storm Ampil will intensify during the next 24 hours.  Ampil could intensify rapidly at times.  Tropical Storm Ampil is likely to strengthen to a typhoon within 36 hours.

Tropical Storm Ampil will move around the western side of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer Ampil toward the north during the next 24 hours.  On its anticipated track, Tropical Storm Ampil will move closer to central Honshu.

Elsewhere over the Western North Pacific Ocean, former Tropical Storm Maria weakened to a tropical depression over the Sea of Japan, and a subtropical cyclone east of Japan made a transition to Tropical Storm Son-tinh.

At 5:00 p.m. EDT on Monday the center of Tropical Depression Maria was located at latitude 41.0°N and longitude 138.7°E which put the center about 100 miles (160 km) west-southwest of Aomori, Japan.  Maria was moving toward the north-northwest at 9 m.p.h. (15 km/h).  The maximum sustained wind speed was 30 m.p.h. (50 km/h) and there were wind gusts to 40 m.p.h. (65 km/h).  The minimum surface pressure was 999 mb.

At 5:00 p.m. EDT on Monday the center of Tropical Storm Son-tinh was located at latitude 3.7°N and longitude 149.0°E which put the center about 560 miles (905 km) east of Tokyo, Japan. Son-tinh was moving toward the northwest 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 993 mb.

 

Tropical Storm Maria Brings Wind and Rain to Northern Honshu

Tropical Storm Maria brought wind and rain to northern Honshu on Sunday night.  At 11:00 p.m. EDT on Sunday the center of Tropical Storm Maria was located at latitude 39.4°N and longitude 141.2°E which put the center about 10 miles (15 km) east of Hanamaki, Japan.  Maria was moving toward the northwest at 14 m.p.h. (22 km/h). The maximum sustained wind speed was 60 m.p.h. (95 km/h) and there were wind gusts to 75 m.p.h. (120 km/h).  The minimum surface pressure was 984 mb.

Tropical Storm Maria brought wind and rain to northern Honshu on Sunday night.  The center of Maria’s circulation made landfall near Kesennuma in Miyagi prefecture.  Tropical Storm Maria exhibited more organization as it neared landfall in northern Honshu.  A small circular eye appeared on both satellite images and radar images from the Japan Meteorological Agency.  The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms.  Bands of thunderstorms were revolving around the center of Maria’s circulation.

The circulation around Tropical Storm Maria was fairly symmetrical at the time of landfall.  Winds to tropical storm force extended out 120 miles (195 km) from the center of Maria’s circulation.

Tropical Storm Maria will move around the western end of a high pressure system over the North Pacific Ocean.  The high pressure system will steer Maria toward the northwest during the next 24 hours.  On its anticipated track, Tropical Storm Maria will move over Iwate and Akita prefectures.  Maria could move over the Sea of Japan in 12 hours.

Tropical Storm Maria will weaken steadily as it moves across northern Honshu.  Maria will continue to bring gusty winds and locally heavy rain to parts of Iwate and Akita prefectures during the next 12 to 24 hours.  Heavy rain could cause flash floods in some locations.

Tropical Storm Maria Moves Toward Northern Honshu

Tropical Storm Maria moved toward northern Honshu on Saturday night.  At 11:00 p.m. EDT on Saturday the center of Tropical Storm Maria was located at latitude 37.7°N and longitude 144.4°E which put the center about 235 miles (355 km) east-southeast of Sendai, Japan.  Maria was moving toward the north-northwest at 9 m.p.h. (15 km/h).  The maximum sustained wind speed was 60 m.p.h. (95 km/h) and there were wind gusts to 75 m.p.h. (120 km/h).  The minimum surface pressure was 981 mb.

Tropical Storm Maria exhibited more organization on Saturday night as it moved closer to northern Honshu.  The inner end of a rainband wrapped around the center of Maria’s circulation.  A small circular eye appeared intermittently on satellite images.  Bands of showers and thunderstorms revolved around the center of Tropical Storm Maria.  Storms near the center generated upper level divergence that pumped mass away from the tropical storm.

The distribution of wind speeds around Tropical Storm Maria was more symmetrical on Saturday.  Winds to tropical storm force extended out 155 miles (250 km) from the center to Maria’s circulation.

Tropical Storm Maria will move through an environment somewhat favorable for intensification during the next 18 hours.  Maria will move over water where the Sea Surface Temperatures are near 28°C.  It will move under the eastern part of an upper level ridge over Japan.  The upper level winds are weak in that part of the ridge and there will be little vertical wind shear.  Tropical Storm Maria could intensify during the next 18 hours, but it is more likely that Maria will maintain its current intensity.

Tropical Storm Maria will move around the southwestern part of a high pressure system over the North Pacific Ocean.  The high pressure system will steer Maria toward the west-northwest during the next 24 hours.  On its anticipated track, Tropical Storm Maria will approach the coast of northern Honshu in less than 24 hours.

Tropical Storm Maria will bring strong winds and locally heavy rain to northern Honshu.  Heavy rain could cause flash floods in some locations.

Tropical Storm Maria Spins East of Japan

Tropical Storm Maria was spinning east of Japan on Friday.  At 5:00 p.m. EDT on Friday the center of Tropical Storm Maria was located at latitude 34.5°N and longitude 145.8°E which put the center about 400 miles (645 km) east of Tokyo, Japan.  Maria was moving toward the north at 15 m.p.h. (24 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 987 mb.

Former Typhoon Maria weakened back to a tropical storm over the Western North Pacific Ocean east of Japan on Friday.  The wind in the western part of Maria appeared to pull drier air around the southern side of Maria’s circulation.  The drier caused many of the thunderstorms in southern side of Tropical Storm Maria to dissipate.  Bands in the southern half of Maria’s circulation consisted primarily of showers and lower clouds.  Thunderstorms were still occurring in bands in the northern half of Tropical Storm Maria.

The distribution of wind speeds in Tropical Storm Maria was asymmetrical.  Winds to tropical storm force extended out 140 miles (225 km) in the eastern side of Maria’s circulation.  Winds to tropical storm force only extended out 85 miles (135 km) in the western side of Tropical Storm Maria.

Tropical Storm Maria will move through an environment somewhat favorable for intensification during the next 24 hours.  Maria will move over water where the Sea Surface Temperatures are near 28°C.  It will move under the eastern part of an upper level trough over Japan.  The upper level trough will produce southwesterly winds that will blow toward the top of Maria’s circulation.  Those winds will cause some vertical wind shear.  The vertical wind shear and the drier air in Tropical Storm Maria will inhibit intensification.  Tropical Storm Maria could intensify during the next 24 hours even with the effects of the wind shear and drier air.

Tropical Storm Maria will move around the western side of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer Maria toward the north during the next 24 hours.  On its anticipated track, Tropical Storm Maria will move closer to eastern Japan.  Maria could start to move toward Honshu during the weekend.

 

Maria Intensifies to a Typhoon Southeast of Japan

Former Tropical Storm Maria intensified to a typhoon southeast of Japan on Thursday.  At 5:00 p.m. EDT on Thursday the center of Typhoon Maria was located at latitude 30.5°N and longitude 145.8°E which put the center about 505 miles (815 km) southeast of Tokyo, Japan.  Maria was moving toward the north at 14 m.p.h. (22 km/h).  The maximum sustained wind speed was 80 m.p.h. (130 km/h) and there were wind gusts to 100 m.p.h. (160 km/h).  The minimum surface pressure was 969 mb.

Former Tropical Storm Maria intensified to a typhoon over the Western North Pacific Ocean southeast of Japan on Thursday.  A small circular eye formed at the center of Maria’s circulation.  The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms.  Bands of showers and thunderstorms revolved around the core of Typhoon Maria.  Storm near the core generated upper level divergence that pumped mass away from the typhoon.  The removal of mass caused the surface pressure to decrease.

The circulation around Typhoon Maria was very small.  Winds to typhoon force extended out 25 miles (40 km) in the eastern side of Maria’s circulation.  Winds to tropical storm force extended out 70 miles (110 km) from the center of Typhoon Maria.

Typhoon Maria will move through an environment favorable for intensification during the next 24 hours.  Maria will move over water where the Sea Surface Temperatures are near 30°C.  It will move under the southeastern part of an upper level trough over Japan.  The upper level trough will produce southwesterly winds that will blow toward the top of Maria’s circulation.  Those winds will cause some vertical wind shear, but the wind shear will not be enough to prevent intensification.  Tropical Storm Maria is likely to continue to intensify during the next 24 hours.

Typhoon Maria will move around the western side of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer Maria toward the north during the next 24 hours.  On its anticipated track, Typhoon Maria will move closer to eastern Japan.

 

Tropical Storm Maria Forms South of Japan

Tropical Storm Maria formed south of Japan on Wednesday.  At 5:00 p.m. EDT on Wednesday the center of Tropical Storm Maria was located at latitude 26.1°N and longitude 143.3°E which put the center about 695 miles (1120 km) south-southeast of Tokyo, Japan.  Maria was moving toward the east-northeast at 7 m.p.h. (11 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 994 mb.

A low pressure system over the Western North Pacific Ocean south-southeast of Tokyo strengthened on Wednesday and the Japan Meteorological Agency designated the system as Tropical Storm Maria.  More thunderstorms formed near the center of Maria’s circulation.  More thunderstorms also developed in bands in the southern and eastern parts of Tropical Storm Maria.  Bands in the northern and western parts of Maria consisted primarily of showers and lower clouds.  Storms near the center of Maria’s circulation began to generate upper level divergence that pumped mass away from the tropical storm.

Winds to tropical storm force extended out 120 miles (195 km) from the center of Tropical Storm Maria.

Tropical Storm Maria will move through an environment favorable for intensification during the next 24 hours.  Maria will move over water where the Sea Surface Temperatures are near 30°C.  It will move under the southeastern part of an upper level trough over Japan.  The upper level trough will produce southwesterly winds that will blow toward the top of Maria’s circulation.  Those winds will cause some vertical wind shear, but the wind shear will not be enough to prevent intensification.  Tropical Storm Maria will intensify during the next 24 hours.  Maria could strengthen to a typhoon by Friday.

Tropical Storm Maria will move around the western side of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer Maria toward the north during the next 24 hours.  On its anticipated track, Tropical Storm Maria will move closer to eastern Japan.

Typhoon Lan Rapidly Intensifies to Equivalent of a Major Hurricane

Typhoon Lan rapidly intensified to the equivalent of a major hurricane over the Western North Pacific Ocean south of Japan on Thursday. At 11:00 p.m. EDT on Thursday the center of Typhoon Lan was located at latitude 27.1°N and longitude 142.8°E which put it about 615 miles (995 km) south-southeast of Tokyo, Japan. Lan was moving toward the north at 6 m.p.h. (10 km/h). The maximum sustained wind speed was 130 m.p.h. (210 km/h) and there were wind gusts to 160 m.p.h. (260 km/h). The minimum surface pressure was 936 mb.

Typhoon Lan intensified to the equivalent of a Category 4 hurricane on the Saffir-Simpson Scale on Thursday. A circular eye with a diameter of 28 miles (45 km) developed at the center of Lan’s circulation. The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms were revolving around the core of Typhoon Lan. Storms near the core generated upper level divergence that pumped mass away from the typhoon in all directions. The removal of large quantities of mass caused the surface pressure to decrease rapidly.

The size of the circulation around Typhoon Lan increased when Lan intensified rapidly on Thursday. Winds to typhoon force extended out 45 miles (75 km) from the center of Lan’s circulation. Winds to tropical storm force extended out 160 miles (260 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon Lan was 25.1. The Hurricane Size Index (HSI) was 14.0 and the Hurricane Wind Intensity Size (HWISI) was 39.1. Typhoon Lan was similar in size and intensity to Hurricane Harvey when Harvey hit Texas in 2017.

Typhoon Lan will move through an environment favorable for intensification during the next 24 hours. Lan will move over water where the Sea Surface Temperatures are near 28°C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Typhoon Lan is likely to intensify during the next 24 hours unless the inner end of a rainband wraps around the existing eye and eyewall. If concentric eyewalls form, then an eyewall replacement cycle could cause Typhoon Lan to weaken.

Typhoon Lan will move around the western part of a high pressure system over the Western North Pacific Ocean. The high pressure system will steer Lan toward the northwest during the next 24 hours. On its anticipated track, Typhoon Lan will bring strong, gusty winds and locally heavy rain to Chichi Jima during the next 24 hours. Typhoon Lan could approach Honshu in four days.

Elsewhere over the Western North Pacific Ocean, former Tropical Storm Khanun produced gusty winds and locally heavy rain over South Korea. At 5:00 p.m. EDT on Thursday the center of Tropical Depression Khanun was located at latitude 38.9°N and longitude 127.0°E which put it about 85 miles (135 km) north-northeast of Seoul, South Korea. Khanun was moving toward the northwest at 9 m.p.h. (15 km/h). The maximum sustained wind speed was 30 m.p.h. (50 km/h) and there were wind gusts to 40 m.p.h. (65 km/h). The minimum surface pressure was 994 mb.

Tropical Storm Khanun Hits South Korea

Tropical Storm Khanun hit South Korea on Wednesday night. At 11:00 p.m. EDT on Wednesday the center of Tropical Storm Khanun was located at latitude 35.5°N and longitude 128.4°E which put it about 20 miles (30 km) south-southeast of Chinhae, South Korea. Khanun was moving toward the north 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 984 mb.

Tropical Storm Khanun hit the southern coast of South Korea on Wednesday night. The center of Khanun made landfall near Busan and Chinhae. Tropical Storm Khanun brought gusty winds and locally heavy rain to the southern half of South Korea. Winds to tropical storm force extended out 175 miles (285 km) from the center of Khanun’s circulation.

Tropical Storm Khanun will move around the western part of a high pressure system over the Western North Pacific Ocean during the next 24 hours. The high pressure system will steer Khanun toward the north-northwest. On its anticipated track, the center of Tropical Storm Khanun will be near Seoul in less than 12 hours. Khanun will continue to produce gusty winds and locally heavy rain in South Korea on Thursday. Heavy rain could cause flash floods in some locations.

Elsewhere over the Western North Pacific Ocean, former Tropical Storm Lan intensified to a typhoon. At 11:00 p.m. EDT on Wednesday the center of Typhoon Lan was located at latitude 25.4°N and longitude 143.7°E which put it about 165 miles (265 km) east of Iwo To. Lan was moving toward the west at 7 m.p.h. (11 km/h). The maximum sustained wind speed was 75 m.p.h. (120 km/h) and there were wind gusts to 90 m.p.h. (145 km/h). The minimum surface pressure was 975 mb. Typhoon Lan is forecast to move toward Honshu and to strengthen.

Tropical Storm Khanun Brings Wind and Rain to Kyushu

Tropical Storm Khanun brought wind and rain to Kyushu on Tuesday. At 11:00 p.m. EDT on Tuesday the center of Tropical Storm Khanun was located at latitude 31.2°N and longitude 129.1°E which put it about 85 miles (135 km) west-southwest of Kagoshima, Japan. Khanun was moving toward the northwest at 7 m.p.h. (11 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 979 mb.

Bands in the eastern side of Tropical Storm Khanun brought winds and rain to Kyushu on Tuesday. There was an elliptical area of relatively clear skies at the center of Khanun’s circulation. A broken ring of thunderstorms with a diameter of 70 miles (110 km) surrounded the relatively clear area. The strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms were revolving around the center of Tropical Storm Khanun. Storms near the center generated upper level divergence that pumped mass away from the tropical storm. Winds to tropical storm force extended out 175 miles (280 km) from the center of Khanun’s circulation.

Tropical Storm Khanun will move through an environment that will be somewhat favorable for intensification during the next 24 hours. Khanun will move over water where the Sea Surface Temperatures are near 28˚C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Tropical Storm Khanun could intensify a little during the next 24 hours.

Tropical Storm Khanun will move around the western part of a high pressure system over the Western North Pacific Ocean. The high pressure system will steer Khanun toward the northwest during the next 24 hours. On its anticipated track, Tropical Storm Khanun will make landfall in South Korea in less than 24 hours. Khanun will bring gusty winds and locally heavy rain to South Korea. Heavy rain could cause flash floods in some locations. Bands in the eastern side of Tropical Storm Khanun will continue to produce gusty winds and locally heavy rain in Kyushu during the next 24 hours.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Lan intensified east of Iwo To. At 11:00 p.m. EDT on Tuesday the center of Tropical Storm Lan was located at latitude 24.4°N and longitude 146.6°E which put it about 335 miles (540 km) east of Iwo To. Lan was moving toward the west at 7 m.p.h. (11 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 988 mb.

Tropical Storm Khanun Moves Toward Kyushu

Tropical Storm Khanun started to move toward Kyushu on Monday. At 11:00 p.m. EDT on Monday the center of Tropical Storm Khanun was located at latitude 29.1°N and longitude 130.7°E which put it about 195 miles (315 km) south of Kagoshima, Japan. Khanun was moving toward the north-northwest at 5 m.p.h. (8 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 981 mb.

Tropical Storm Khanun weakened on Monday. There still were no thunderstorms near the center of Khanun’s circulation. A large, mostly clear area was at the center of Tropical Storm Khanun. There were bands of showers and lower clouds within the mostly clear area. A broken ring of thunderstorms with a diameter of 90 miles (145 km) surrounded the mostly clear area. The strongest winds were occurring in the broken ring of storms. Storms in the ring generated upper level divergence that pumped mass away from the tropical storm. There were also bands of showers and thunderstorms outside the broken ring. Winds to tropical storm force extended out 200 miles (325 km) from the center of Tropical Storm Khanun.

Tropical Storm Khanun will move through an environment that will be somewhat favorable for intensification during the next 24 hours. Khanun will move over water where the Sea Surface Temperatures are near 28˚C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. If Tropical Storm Khanun intensifies during the next 24 hours, it is likely to strengthen slowly, because of the lack of thunderstorms in the inner core of its circulation. If thunderstorms form closer to the center of Khanun’s circulation, then it could start to intensify a little faster.

Tropical Storm Khanun will move around the western part of a high pressure system over the Western North Pacific Ocean. The high pressure system will steer Khanun toward the north-northwest during the next 24 hours. On its anticipated track, The center of Tropical Storm Khanun will be west of Kyushu in 24 hours. Bands in the eastern side of Tropical Storm Khanun will produce gusty winds and locally heavy rain in Kyushu. Heavy rain could cause flash floods in some locations.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Lan formed southeast of Japan. At 11:00 p.m. EDT on Monday the center of Tropical Storm Lan was located at latitude 24.6°N and longitude 148.8°E which put it about 485 miles (780 km) south of Kagoshima, Japan. Lan was moving toward the northwest at 5 m.p.h. (8 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 988 mb.