Tag Archives: Amami Oshima

Tropical Storm Khanun Meanders over Northern Ryukyu Islands

Tropical Storm Khanun meandered over the northern Ryukyu Islands on Saturday. At 11:00 p.m. EDT on Saturday the center of Tropical Storm Khanun was located at latitude 27.5°N and longitude 129.8°E which put it about 125 miles (200 km) northeast of Okinawa. Khanun was moving toward the southeast at 8 m.p.h. (13 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 976 mb.

Tropical Storm Khanun meandered over the northern Ryukyu Islands on Saturday. The center of Khanun’s circulation was over Amami Oshima. Bands revolving around the center of Tropical Storm Khanun were bringing rain to Okinawa, Amami Oshima and other northern Ryukyu Islands. A weather station at Kadena Air Force Base was reporting a sustained wind speed of 35 m.p.h. (56 km/h) and a wind gust of 53 m.p.h. (85 km/h).

There was a large circulation around Tropical Storm Khanun. Winds to tropical storm force extended out 225 miles (360 km) from the center of Khanun. The region near the center of circulation contained bands of showers and low clouds. Farther away from the center, a band of thunderstorms stretched around the western, southern and eastern parts of Tropical Storm Khanun. Storms in that bands generated upper level divergence that pumped mass away from the tropical storm.

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. However, Tropical Storm Khanun will probably not intensify during the next 24 hours, because of the lack of thunderstorms in the inner core of its circulation. The large circulation around Tropical Storm Khanun seems to be in an equilibrium with its environment and the intensity may not change much during the next 24 hours..

Tropical Storm Khanun will move around the northwestern part of a subtropical high pressure system over the Western North Pacific Ocean. The high pressure system will steer Khanun slowly toward the east during the next 24 hours. On its anticipated track, the center of Tropical Storm Khanun will move a little to the east of the northern Ryukyu Islands during the next 24 hours. Tropical Storm Khanun will continue to produce strong, gusty winds and locally heavy rain in Okinawa, Amami Oshima and the other northern Ryukyu Islands. Prolonged heavy rain will cause flash floods in some locations.

Tropical Storm Khanun Brings Gusty Winds and Rain Back to Okinawa

Tropical Storm Khanun brought gusty winds and rain back to Okinawa on Friday night. A weather station at Kadena Air Force Base reported a sustained wind speed of 52 m.p.h. (84 km/h) and a wind gust of 69 m.p.h. (111 km/h). At 11:00 p.m. EDT on Friday the center of Tropical Storm Khanun was located at latitude 27.7°N and longitude 127.2°E which put it about 100 miles (160 km) northwest of Okinawa. Khanun was moving toward the east at 5 m.p.h. (8 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 972 mb.

Former Typhoon Khanun weakened to a tropical storm on Friday. The bands in the inner core of Khanun’s circulation consisted of low clouds and showers. Bands of thunderstorms were located in the eastern and southern parts of Tropical Storm Khanun. Bands in the northwestern part of Khanun also consisted primarily of showers and lower clouds. The bands of thunderstorms generated upper level divergence that pumped mass away to the east of the tropical storm. Winds to tropical storm force extended out 200 miles (325 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. However, Tropical Storm Khanun is unlikely to intensify during the next 24 hours, because of the lack of thunderstorms in the inner core of its circulation. The large circulation around Tropical Storm Khanun seems to be in an equilibrium with its environment and the intensity may not change much during the next 36 hours..

Tropical Storm Khanun will move around the northwestern part of a subtropical high pressure system over the Western North Pacific Ocean. The high pressure system will steer Khanun toward the east during the next 24 hours. On its anticipated track, the center of Tropical Storm Khanun will pass north of Okinawa in 12 hours. The center of Khanun could pass over Amami Oshima in less than 24 hours. Tropical Storm Khanun will continue to produce strong, gusty winds and locally heavy rain in Okinawa, Amami Oshima and the other northern Ryukyu Islands. Heavy rain will cause flash floods in some locations.

Powerful Typhoon Nanmadol Is East of Okinawa

Powerful Typhoon Nanamadol was east of Okinawa on Friday night. At 11:00 p.m. EDT on Friday the center of Typhoon Nanmadol was located at latitude 26.4°N and longitude 132.7°E which put it about 330 miles (530 km) east of Okinawa. Nanmadol was moving toward the northwest at 9 m.p.h. (15 km/h). The maximum sustained wind speed was 150 m.p.h. (240 km/h) and there were wind gusts to 185 m.p.h. (295 km/h). The minimum surface pressure was 926 mb.

Powerful Typhoon Nanmadol was churning over the Western North Pacific Ocean east of Okinawa on Friday night. A circular eye with a diameter of 23 miles (37 km) was present at the center of Nanmadol. The eye was surrounded by a ring of strong thunderstorms and the strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms were revolving around the core of Typhoon Nanmadol. Storms near the core generated upper level divergence that pumped mass away from the typhoon in all directions.

The size of the circulation around Typhoon Nanmadol increased on Friday when Nanmadol intensified. Winds to typhoon force extended out 100 miles (160 km) from the center of Nanmadol. Winds to tropical storm force extended out 260 miles (420 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon Nanmadol was 31.6. The Hurricane Size Index (HSI) was 28.0 and the Hurricane Wind Intensity Size Index (HWISI) was 59.6. Typhoon Nanmadol was capable of causing widespread severe damage.

Typhoon Nanmadol will move through an environment capable of supporting a powerful typhoon during the next 24 hours. Nanmadol will move over water where the Sea Surface Temperatures are near 29˚C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Typhoon Nanmadol could maintain much of its intensity during the next 24 hours. If the inner end of a rainband wraps around the existing eye and eyewall, then concentric eyewalls could form. That would be the start of an eyewall replacement cycle that would cause Nanmadol to weaken.

Typhoon Nanmadol will move around the southwestern part of a high pressure system over the Western North Pacific Ocean. The high pressure system will steer Nanmadol toward the northwest during the next 24 hours. On its anticipated track the center of Typhoon Nanmadol will be east of Minami Daito Jima within 12 hours. Nanmadol could be east of Amami Oshima in 24 hours. Typhoon Nanmadol will bring strong, gusty winds and heavy rain to parts of the northern Ryukyu Islands during the weekend. Nanmadol could be near western Kyushu in 36 hours.

Typhoon Nanmadol Rapidly Intensifies to Equivalent of a Major Hurricane

Typhoon Nanmadol rapidly intensified to the equivalent of a major hurricane south of Japan during Thursday night. At 11:00 p.m. EDT on Thursday the center of Typhoon Nanmadol was located at latitude 24.1°N and longitude 135.4°E which put it about 535 miles (860 km) east-southeast of Okinawa. Nanmadol was moving toward the northwest at 8 m.p.h. (13 km/h). The maximum sustained wind speed was 125 m.p.h. (200 km/h) and there were wind gusts to 155 m.p.h. (250 km/h). The minimum surface pressure was 947 mb.

Typhoon Nanmadol rapidly intensified to the equivalent of a major hurricane over the Western North Pacific Ocean south of Japan during Thursday night. A well formed circular eye was present at the center of Nanmadol’s circulation. The eye was surrounded by a ring of strong thunderstorms and the strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms were revolving around the core of Typhoon Nanmadol. Storms near the core generated strong upper level divergence that pumped mass away from the typhoon in all directions.

The circulation around Typhoon Nanmadol was symmetrical. Winds to typhoon force extended out 60 miles (95 km) from the center of Nanmadol. Winds to tropical storm force extended out 200 miles (320 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon Nanmadol was 23.6. The Hurricane Size Index (HSI) was 20.6 and the Hurricane Wind Intensity Size Index (HWISI) was 44.2. Typhoon Nanmadol was capable of causing widespread major damage.

Typhoon Nanmadol will move through an environment favorable for intensification during the next 24 hours. Nanmadol will move over water where the Sea Surface Temperatures are near 29˚C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Typhoon Nanmadol will intensify during the next 24 hours. If the inner end of a rainband wraps around the existing eye and eyewall, then concentric eyewalls could form. That would be the start of an eyewall replacement cycle that would cause Nanmadol to weaken.

Typhoon Nanmadol will move around the southwestern part of a high pressure system over the Western North Pacific Ocean. The high pressure system will steer Nanmadol toward then northwest during the next 36 hours. On its anticipated track the center of Typhoon Nanmadol will be east of Minami Daito Jima within 24 hours. Nanmadol could be east of Amami Oshima in 36 hours. Typhoon Nanmadol will bring strong, gusty winds and heavy rain to parts of the northern Ryukyu Islands during the weekend.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Muifa weakened over the northern Yellow Sea. At 11:00 p.m. EDT on Thursday the center of Tropical Storm Muifa was located at latitude 38.5°N and longitude 121.8°E which put it about 50 miles (80 km) northeast of Yantai, China. Muifa was moving toward the north-northeast at 16 m.p.h. (26 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.