Tag Archives: Honshu

Tropical Storm Nakri Moves South of Japan

Tropical Storm Nakri moved south of Japan on Saturday.  At 11:00 a.m. EDT on Saturday the center of Tropical Storm Nakri was located at latitude 29.1°N and longitude 132.0°E which put the center about 320 miles (515 km) south-southwest of Kochi, Japan.  Nakri was moving toward the north-northeast 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 997 mb.

Tropical Storm Nakri started to strengthen on Saturday as it moved south of Japan.  The inner end of a rainband wrapped around the center of Nakri’s circulation.  An eye appeared to be forming at the center of Tropical Storm Nakri.  Bands of showers and thunderstorms were revolving around the center of Nakri’s circulation.  Storms near the center of Nakri generated upper level divergence that pumped mass away to the east of the tropical storm.  The removal of mass caused the surface pressure to decrease.

The size of the circulation around Tropical Storm Nakri was relatively small.  Winds to tropical storm force extended out 105 miles (165 km) from the center of Nakri’s circulation.

Tropical Storm Nakri will move through an environment favorable for intensification during the next 24 hours.  Nakri will move over water where the Sea Surface Temperatures are near 28°C.  It will move under the eastern side of an upper level trough that is west of Japan.  The upper level trough will produce southwesterly winds that will blow toward the top of Nakri’s circulation.  However, the winds in the lower atmosphere will also blow from the west.  So, there will not be a lot of vertical wind shear.  Tropical Storm Nakri will intensify during the next 24 hours.  Nakri could strengthen to a typhoon on Sunday.

The upper level trough that is west of Japan will steer Tropical Storm Nakri toward the northeast during the next 24 hours.  On its anticipated track, Tropical Storm Nakri will move south of Honshu on Sunday.

Typhoon Halong Intensifies to Equivalent of a Major Hurricane

Typhoon Halong intensified to the equivalent of a major hurricane over the Western North Pacific Ocean south of Japan on Tuesday morning.  At 11:00 a.m. EDT on Tuesday the center of Typhoon Halong was located at latitude 28.4°N and longitude 137.2°E which put the center about 490 miles (785 km) south-southwest of Tokyo, Japan.  Halong was moving toward the northwest at 8 m.p.h. (13 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 942 mb.

Typhoon Halong intensified to the equivalent of a Category 4 hurricane on the Saffir-Simpson Scale on Tuesday morning.  A circular eye with a diameter of 40 miles (65 km) was at the center of Halong’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 Halong.  Storms near the core of Halong generated upper level divergence that pumped mass away from the typhoon in all directions.  The removal of large amounts of mass caused the surface pressure to decrease rapidly.

The circulation around Typhoon Halong was relatively small.  Winds to typhoon force extended out 30 miles (50 km) from the center of Halong’s circulation.  Winds to tropical storm force extended out 140 miles (225 km) from the center of Typhoon Halong.

The Hurricane Intensity Index (HII) for Typhoon Halong was 25.1.  The Hurricane Size Index (HSI) was 10.2 and the Hurricane Wind Intensity Size Index (HWISI) was 35.3.  Typhoon Halong was similar in size and intensity to Hurricane Harvey when Harvey hit Texas in 2017.

Typhoon Halong will move through an environment that is favorable for intensification during the next 24 hours.  Halong will move over water where the Sea Surface Temperatures are near 29°C.  It will move under the middle of an upper level ridge that is south of Japan.  The upper level winds are weak near the middle of the upper level ridge and there will be little vertical wind shear.  Typhoon Halong will intensify during the next 24 hours.

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

Tropical Storm Peipah Brings Wind and Rain to Japan

Tropical Storm Peipah brought wind and rain to parts of Japan on Thursday.  At 11:00 a.m. EDT on Thursday the center of Tropical Storm Peipah was located at latitude 32.8°N and longitude 132.8°E which put the center about 60 miles (95 km) southwest of Kochi, Japan.  Peipah was moving toward the 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 997 mb.

The circulation around Tropical Storm Peipah exhibited more organization on Thursday.  More thunderstorms formed near the center of Peipah’s circulation.  Thunderstorms were also occurring in bands in the eastern and northern parts of Tropical Storm Peipah.  Bands in the western and southern parts of Peipah’s circulation still consisted primarily of showers and lower clouds.  Storms near the center of Peipah generated upper level divergence that pumped mass away to the northeast of the tropical storm.

In spite of the improved organization the distribution of wind speeds in Tropical Storm Peipah continued to be asymmetrical.  Winds to tropical storm force extended out 125 miles (200 km) in the southeastern quadrant of Peipah’s circulation.  The winds in the other parts of Tropical Storm Peipah were blowing at less than tropical storm force.

Tropical Storm Peipah will move through an environment somewhat favorable for intensification during the next 24 hours.  Peipah will move over water where the Sea Surface Temperatures are near 29°C.  It will move under the southern part of an upper level trough that is northwest of Japan.  The upper level trough will produce westerly winds that will blow toward the top of Peipah’s circulation.  Those winds will cause moderate vertical wind shear. The vertical wind shear will inhibit intensification but the wind shear may not be enough to prevent intensification.  The center of Peipah will pass over southern Shikoku during the next few hours.  Tropical Storm Peipah could intensify a little during the next 24 hours when the center of circulation is over water.

The upper level trough that is northwest of Japan will steer Tropical Storm Peipah toward the east-northeast during the next 24 hours.  On its anticipated track, the center of Peipah’s circulation will move over southern Shikoku during the next few hours.  The center of Peipah will be south of Kyoto in 12 hours.  Tropical Storm Peipah could be near Tokyo in 24 hours.

Tropical Storm Peipah will bring gusty winds and locally heavy rain to parts of Shikoku and Honshu.  Heavy rain could cause flash floods in some locations.

Tropical Storm Peipah Forms Near Kyushu

Tropical Storm Peipah formed over the Western North Pacific Ocean just to the south of Kyushu on Wednesday evening.  At 11:00 p.m. EDT on Wednesday the center of Tropical Storm Peipah was located at latitude 30.3°N and longitude 131.4°E which put the center about 110 miles (175 km) south of Miyazaki, Japan.  Peipah was moving toward the north at 18 m.p.h. (30 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 999 mb.

A low pressure system over the Western North Pacific Ocean just to the south of Kyushu strengthened on Wednesday evening and the Japan Meteorological Agency designated the system as Tropical Storm Peipah.

The distribution of thunderstorms in Tropical Storm Peipah was asymmetrical.  Thunderstorms were occurring in bands in the northern and eastern parts of Peipah’s circulation.  Bands in the southern and western parts of Tropical Storm Peipah consisted primarily of showers and lower clouds.  Storms near the center of Peipah generated upper level divergence that pumped mass away to the northeast of the tropical storm.

The distribution of wind speeds in Tropical Storm Peipah was also asymmetrical.  Winds to tropical storm force extended out 85 miles (135 km) in the eastern side of Peipah’s circulation.  The winds in the western side of Tropical Storm Peipah were blowing at less than tropical storm force.

Tropical Storm Peipah will move through an environment somewhat favorable for intensification during the next 24 hours.  Peipah will move over water where the Sea Surface Temperatures are near 30°C.  It will move under the northern part of an upper level ridge that is south of Japan.  The upper level ridge will produce westerly winds that will blow toward the top of Peipah’s circulation.  Those winds will cause moderate vertical wind shear.  The vertical wind shear will inhibit intensification but the wind shear may not be enough to prevent intensification.  Tropical Storm Peipah could intensify a little during the next 24 hours.

Tropical Storm Peipah will move around the northern side of a high pressure system that is south of Japan.  The high pressure system will steer Peipah toward the northeast during the next 24 hours.  On its anticipated track, the center of Tropical Storm Peipah will pass just to the east of Kyushu during the next 12 hours.  Peipah could move near the southern coast of Shikoku later on Thursday.  The center of Tropical Storm Peipah could be south of Osaka in 24 hours.

Tropical Storm Peipah will bring gusty winds and locally heavy rain to parts of Kyushu, Shikoku and Honshu.  Heavy rain could cause flash floods in some locations.

Tropical Storm Bailu Forms South of Japan

Tropical Storm Bailu formed over the Western North Pacific Ocean south of Japan on Saturday.  At 11:00 p.m. EDT on Saturday the center of Tropical Storm Bailu was located at latitude 33.9°N and longitude 142.6°E which put the center about 185 miles (295 km) south of Tokyo, Japan.  Bailu was moving toward the north-northeast at 29 m.p.h. (46 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.

A low pressure system over the Western North Pacific Ocean strengthened on Saturday and the Japan Meteorological Agency designated the system as Tropical Storm Bailu.

The distribution of thunderstorms in Tropical Storm Bailu was asymmetrical.  Thunderstorms were occurring in bands in the northern part of Bailu’s circulation.  Thunderstorms were also occurring in bands in the southwestern part of Tropical Storm Bailu.  Bands in the other parts of Bailu’s circulation consisted primarily of showers and lower clouds.

The distribution of wind speeds in Tropical Storm Bailu was also asymmetrical.  Winds to tropical storm force extended out 175 miles (280 km) in the southern half of Bailu’s circulation.  The winds in the northern side of Tropical Storm Bailu were blowing at less than tropical storm force.

Tropical Storm Bailu will move through an environment marginally favorable for intensification during the next 24 hours.  Bailu 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 north of Japan.  The upper level trough will produce southwesterly winds that will blow toward the top of Bailu’s circulation.  Those winds will cause moderate vertical wind shear.  The vertical wind shear will inhibit intensification.  Tropical Storm Bailu could intensify during the next 24 hours, if the vertical wind shear does not increase.

The upper level trough north of Japan will steer Tropical Storm Bailu quickly toward the east-northeast during the next 24 hours.  On its anticipated track, Tropical Storm Bailu will move quickly away from Honshu on Sunday.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Krosa was moving rapidly away from Japan.  At 11:00 p.m. EDT on Saturday the center of Tropical Storm Krosa was located at latitude 40.2°N and longitude 152.2°E which put the center about 505 miles (820 km) east of Misawa, Japan.  Krosa was moving toward the east-northeast at 28 m.p.h. (45 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 977 mb.

Tropical Storm Nari Strengthens Southeast of Tokyo

Tropical Storm Nari strengthened over the Western North Pacific Ocean southeast of Tokyo on Sunday.  At 5:00 p.m. EDT on Sunday the center of Tropical Storm Nari was located at latitude 33.2°N and longitude 143.0°E which put the center about 300 miles (485 km) southeast of Tokyo, Japan.  Nari was moving toward the north at 17 m.p.h. (28 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 Nari strengthened on Sunday as it moved over the Western North Pacific Ocean southeast of Tokyo.  The structure Nari’s circulation changed when it moved under an upper level low south of Japan.  The inner end of a rainband wrapped around the western and southern sides of the center Tropical Storm Nari.  A region of drier air wrapped around the outside of that rainband.  Thunderstorms were occurring near the center of Naria’s circulation.  Thunderstorms were also occurring in bands in the northeastern part of Tropical Storm Nari.

The distribution of winds speeds in Tropical Storm Nari continued to be asymmetrical.  Winds to tropical storm force extended out 180 miles (290 km) in the eastern side of Nari’s circulation. Winds to tropical storm force extended out 65 miles (105 km) in the western side of Tropical Storm Nari.

Tropical Storm Nari will move through an environment that will be marginally favorable for intensification during the next 12 hours.  Nari will move over water where where the Sea Surface Temperatures are near 28°C.  It will move under the northeastern part of an upper level low south of Japan.  The upper level low will produce southerly winds that will blow toward the top of Nari’s circulation. Those winds will cause moderate vertical wind shear.  The vertical wind shear will inhibit intensification.  Tropical Storm Nari could intensify a little during the next 12 hours.  Nari will move over colder water later on Monday.  The colder water will cause Tropical Storm Nari to start to weaken.  The colder water will also cause Nari to start a transition to an extratropical storm.

Tropical Storm Nari will move around the western side of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer Nari toward the north during the next 24 hours.  On its anticipated track, Tropical Storm Nari will pass east of Honshu.  Nari will be south of Hokkaido in 24 hours.

 

Tropical Storm Nari Develops South of Japan

Tropical Storm Nari developed over the Western North Pacific Ocean south of Japan on Saturday.  At 5:00 p.m. EDT on Saturday the center of Tropical Storm Nari was located at latitude 25.8°N and longitude 142.4°E which put the center about 715 miles (1150 km) south-southeast of Tokyo, Japan.  Nari 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 there were wind gusts to 50 m.p.h. (80 km/h).  The minimum surface pressure was 998 mb.

A low pressure system over the Western North Pacific Ocean strengthened on Saturday and the Japan Meteorological Agency designated the system as Tropical Storm Nari.

More thunderstorms formed near the center of Tropical Storm Nari on Saturday.  More thunderstorms also developed in bands in the eastern side of Nari’s circulation.  Bands in the western side of Tropical Storm Nari consisted primarily of showers and lower clouds.  Storms near the center of Nari generated upper level divergence that pumped mass away to the south of the tropical storm. The removal of mass caused the surface pressure to decrease.

The distribution of winds speeds in Tropical Storm Nari was asymmetrical.  Winds to tropical storm force extended out 110 miles (185 km) in the eastern side of Nari’s circulation.  The winds in the western side of Tropical Storm Nari were blowing at less than tropical storm force.

Tropical Storm Nari will move through an environment that will be mostly favorable for intensification during the next 24 hours.  Nari will move over water where where the Sea Surface Temperatures are near 29°C.  It will move under the southeastern part of an upper level low south of Japan.  The upper level low will produce westerly winds that will blow toward the top of Nari’s circulation,  Those winds will cause moderate vertical wind shear.  The vertical wind shear will inhibit intensification, but the shear will not be enough to prevent intensification.  Tropical Storm Nari will intensify during the next 24 hours.

Tropical Storm Nari will move around the western side of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer Nari toward the north during the next 24 hours.  On its anticipated track, Tropical Storm Nari will move toward eastern Japan.  Nari could approach eastern Honshu in 36 hours.

Tropical Storm Mun Spins Southeast of Japan

Tropical Storm Mun was spinning over the Western North Pacific Ocean southeast of Japan on Thursday evening.  At 11:00 p.m. EDT on Thursday the center of Tropical Storm Mun was located at latitude 29.9°N and longitude 144.9°E which put the center about 495 miles (795 km) southeast of Tokyo, Japan.  Mun was moving toward the north 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 982 mb.

Tropical Storm Mun strengthened on Thursday as it spun over the Western North Pacific Ocean southeast of Japan.  The circulation around Tropical Storm Mun became more symmetrical.  More thunderstorms developed near the center of Mun’s circulation.  Thunderstorms were also occurring in bands revolving around the center of Tropical Storm Mun.  Storms near the center of Mun generated upper level divergence that pumped mass away from the tropical storm.  The removal of mass caused the surface pressure to decrease.

The circulation around Tropical Storm Mun was small.  Winds to tropical storm force extended out 60 miles (95 km) from the center of Mun’s circulation.

Tropical Storm Mun will move through an environment that will be favorable for intensification during the next 24 hours.  Mun will move over water where where the Sea Surface Temperatures are near 27°C.  An upper level low south of Japan will produce southwesterly winds that will blow toward the top of Mun’s circulation.  Those winds will cause moderate vertical wind shear.  The vertical wind shear will inhibit intensification, but the shear will probably not be enough to prevent intensification.  Tropical Storm Mun is likely to intensify during the next 24 hours.  Mun could strengthen to a typhoon.

Tropical Storm Mun will move around the western end of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer Mun toward the northeast during the next 24 hours.  On its anticipated track, Tropical Storm Mun will move farther away from Honshu.

Elsewhere over the Western North Pacific Ocean, Tropical Depression 05W formed south of Taiwan.  At 11:00 p.m. EDT on Thursday the center of Tropical Depression 05W was located at latitude 19.7°N and longitude 118.6°E which put the center about 305 miles (495 km) south-southwest of Kaohsiung, Taiwan.  The tropical depression was moving toward the west-southwest at 7 m.p.h. (11 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 1001 mb.

Sepat Weakens to a Tropical Depression

Former Tropical Storm Sepat weakened to a tropical depression over the Western North Pacific Ocean south of Japan on Tuesday.  At 11:00 p.m. EDT on Tuesday the center of Tropical Depression Sepat was located at latitude 32.4°N and longitude 139.5°E which put the center about 230 miles (370 km) south of Tokyo, Japan.  Sepat was moving toward the north-northwest at 8 m.p.h. (13 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 1005 mb.

Former Tropical Storm Sepat weakened to a tropical depression on Tuesday as it moved over the Western North Pacific Ocean south of Japan.  Many of the thunderstorms in Sepat’s circulation dissipated.  A few thunderstorms were still occurring in the southeastern quadrant of Tropical Depression Sepat.  Most of the bands revolving around the center of Sepat’s circulation consisted primarily of showers and lower clouds.

Tropical Depression Sepat will move through an environment that will be unfavorable for intensification during the next 24 hours.  Sepat will move over water where where the Sea Surface Temperatures are near 25°C.  It will move under the northern part of an upper level ridge south of Japan.  The upper level ridge will produce west-southwesterly winds that will blow toward the top of Sepat’s circulation.  Those winds will cause strong vertical wind shear.  The strong vertical wind shear and marginal Sea Surface Temperatures will cause Tropical Depression Sepat to continue to weaken during the next 24 hours.

Tropical Depression Sepat will move around the western end of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer Sepat toward the north during the next 24 hours.  On its anticipated track, Tropical Depression Sepat will approach eastern Honshu in 12 hours.  The center of Sepat’s circulation is likely to pass just to the southeast of Tokyo.

Tropical Depression Sepat is likely to bring gusty winds and rain to the part of Honshu southeast of Tokyo.

Tropical Storm Sepat Moves Toward Honshu

Tropical Storm Sepat moved toward Honshu on Monday.  At 11:00 p.m. EDT on Monday the center of Tropical Storm Sepat was located at latitude 29.7°N and longitude 140.7°E which put the center about 420 miles (680 km) south of Tokyo, Japan.  Sepat was moving toward the northwest at 14 m.p.h. (22 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 1003 mb.

Tropical Storm Sepat strengthened a little on Monday morning, but Sepat was showing signs of weakening on Monday evening.  Thunderstorms were still occurring near the center of Tropical Storm Sepat.  Thunderstorms were also occurring bands revolving around the center of Sepat’s circulation.  Storms near the center of Sepat generated upper level divergence that pumped mass away from the tropical storm.  The removal of mass in the upper levels was balanced by the inflow of mass in the lower levels of Tropical Storm Sepat.  The balance of upper level divergence and inflow in the lower levels caused the surface pressure to remain steady.

The distribution of wind speeds in Tropical Storm Sepat was asymmetrical.  Winds to tropical storm force extended out 110 miles (175 km) in the eastern side of Sepat’s circulation.  The winds in the western side of Tropical Storm Sepat were blowing at less than tropical storm force.

Tropical Storm Sepat will move through an environment that will become unfavorable for intensification during the next 24 hours.  Sepat will move over water where where the Sea Surface Temperatures are near 26°C.  It will move under the northern part of an upper level low south of Japan.  The upper level low will produce northeasterly winds that will blow toward the top of Sepat’s circulation.  Those winds will cause moderate vertical wind shear.  The vertical wind shear  and marginal Sea Surface Temperatures will cause Tropical Storm Sepat to weaken during the next 24 hours.  Sepat is likely to weaken to a tropical depression on Tuesday.

Tropical Storm Sepat will move around the western end of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer Sepat toward the north-northwest during the next 24 hours.  On its anticipated track, Tropical Storm Sepat will continue to move toward Honshu.