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Typhoon Champi Brings Wind and Rain to Southern Ryukyu Islands

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Typhoon Champi brought wind and rain to the southern Ryukyu Islands and to northeastern Taiwan on Friday.  At 11:00 a.m. EDT on Friday the center of Typhoon Champi was located at latitude 25.3°N and longitude 122.6°E which put the center about 75 miles (120 km) east of Taipei, Taiwan.  Champi was moving toward the north-northwest at 16 m.p.h. (16 km/h).  The maximum sustained wind speed was 115 m.p.h. (185 km/h) and there were wind gusts to 145 m.p.h. (235 km/h).  The minimum surface pressure was 949 mb.

A weather station on Ishigakijima Island reported a sustained wind speed of 78 m.p.h. (125 km/h).  The weather station also reported 4.94 inches (154.0 mm) of rain.

A weather station in Ohara, Japan reported a sustained wind speed of 75 m.p.h. (121 km/h).

A weather station on Yonagunijima Island reported a sustained wind speed of 66 m.p.h. (107 km/h).  The weather station also reported 8.33 inches (211.5 mm) of rain.

Typhoon Champi was the equivalent of a major hurricane on Friday morning.  Winds to typhoon force extended out 85 miles (135 km) from the center of Champi’s circulation.  Winds to tropical storm force extended out 250 miles (400 km) from the center of Typhoon Champi.

The Hurricane Intensity Index (HII) for Typhoon Champi was 20.6.  The Hurricane Size Index (HSI) was 31.8 and the Hurricane Wind Intensity Size Index (HWISI) was 52.4.  Typhoon Champi was similar in intensity to Hurricane Irma when Irma hit south Florida in 2017.  Champi is larger than Irma was.

Typhoon Champi will move around the western end of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer Champi toward the north during the next 24 hours.  On its anticipated track, Typhoon Champi will remain east of China.

Typhoon Champi will move through an environment that will be unfavorable for intensification during the next 24 hours.  Champi will move over water where the Sea Surface Temperatures are near 26°C.  It will move under the eastern side of an upper level trough that is near the east coast of China.  The upper level trough will produce strong southwesterly winds that will blow toward the top of Champi’s circulation.  Those winds will cause strong vertical wind shear.  Champi will also continue to move through a mass of drier air.  Typhoon Champi is likely to weaken steadily during the next 24 hours because of the effects of strong vertical wind shear and drier air.

Elsewhere over the Western North Pacific Ocean, Tropical Depression 30W formed northwest of Kwajalein.  At 11:00 a.m. EDT on Friday the center of Tropical Depression 30W was located at latitude 10.9°N and longitude 166.3°E which put the center about 185 miles (300 km) northwest of Kwajalein.  The tropical depression moving toward the northwest at 2 m.p.h. (3 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 1004 mb.

Typhoon Champi Approaches Southern Ryukyu Islands

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Typhoon Champi was approaching the southern Ryukyu Islands on Wednesday evening.  At 11:00 p.m. EDT on Wednesday the center of Typhoon Champi was located at latitude 20.6°N and longitude 125.7°E which put the center about 295 miles (475 km) south-southeast of Ishigakijima, Japan.  Champi was moving toward the west-northwest at 11 m.p.h. (17 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 940 mb.

Typhoon Champi weakened on Wednesday.  Even though Champi weakened, it was still a very well organized typhoon.  A circular eye with a diameter of 35 miles (55 km) was at the center of Champi’s circulation.  Bands of showers and thunderstorms were revolving around the the center of Typhoon Champi.  Storms near the center of Champi generated upper level divergence that pumped mass away from the typhoon.  The removal of mass in the upper levels was less than the convergence of mass in the lower levels of the atmosphere.  So, the surface pressure increased on Wednesday.

The circulation around Typhoon Champi was large.  Winds to typhoon force extended out 100 miles (160 km) from the center of Champi’s circulation.  Winds to tropical storm force extended out 345 miles (555 km) from the center of Typhoon Champi.

The Hurricane Intensity Index (HII) for Typhoon Champi is 25.1.  The Hurricane Size Index (HSI) is 34.2 and the Hurricane Wind Intensity Size Index (HWISI) is 59.3.  Typhoon Champi is similar in size to Hurricane Ivan when Ivan hit the northern Gulf Coast in 2004.  Champi is stronger than Ivan was.

Typhoon Champi will move through an environment that will be unfavorable for intensification during the next 24 hours.  Champi 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 near the east coast of China.  The upper level trough will produce southwesterly winds that will blow toward the top of Champi’s circulation.  Those winds will cause the vertical wind shear to increase.   Champi will also move into a region of drier air on Thursday.  Typhoon Champi is likely to weaken during the next 24 hours because of more vertical wind shear and drier air.

Typhoon Champi will move around the western part of a high pressure system that is over the Western North Pacific Ocean. The high pressure system will steer Champi toward the north-northwest during the next 24 hours.  On its anticipated track, the center of Typhoon Champi will be near Ishigakijima in 24 hours.

Typhoon Champi will bring strong winds and heavy rain to the southern Ryukyu Islands.  Heavy rain is likely to cause flash floods in some locations.

Typhoon Champi could also bring strong winds and heavy rain to parts of Taiwan.

Typhoon Koguma Continues to Weaken

Typhoon Koguma continued to weaken on Monday as it moved over the Western North Pacific Ocean east of Japan.  At 11:00 p.m. EDT on Monday the center of Typhoon Koguma was located at latitude 34.6°N and longitude 152.6°E which put the center about 690 miles (1110 km) east of Tokyo, Japan.  Koguma was moving toward the northeast at 28 m.p.h. (45 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 979 mb.

Typhoon Koguma started to make a transition to a strong extratropical cyclone on Monday.  Thunderstorms were still occurring in bands in the eastern and northern parts of Koguma’s circulation.  Bands in the western and southern parts of Typhoon Koguma consisted primarily of showers and lower clouds.  Storms near the center of Koguma generated upper level divergence that pumped mass away to the northeast of the typhoon.  The removal of mass in the upper levels was less than the convergence of mass in the lower levels of the atmosphere.  So, the surface pressure increased on Monday.

Even though Typhoon Koguma started a transition to an extratropical cyclone on Monday, the distribution of wind speeds was still fairly symmetrical.  Winds to typhoon force extended out 60 miles (95 km) from the center of Koguma’s circulation.  Winds to tropical storm force extended out 140 miles (225 km) from the center of Typhoon Koguma.

Typhoon Koguma will move through an environment that will be unfavorable for intensification of a typhoon during the next 24 hours.  Koguma will move over water where the Sea Surface Temperatures are near 22°C.  It will move under the eastern side of an upper level trough that is east of Japan.  The upper level trough will produce southwesterly winds that will blow toward the top of Koguma’s circulation.  Those winds will cause strong vertical wind shear.  Typhoon Koguma will continue to weaken on Tuesday as it makes a transition to a strong extratropical cyclone.

The upper level trough that is east of Japan will steer Typhoon Koguma quickly toward the northeast during the next 24 hours.  On its anticipated track, Typhoon Koguma will move farther away from Japan.

Typhoon Koguma Weakens

Typhoon Koguma weakened on Sunday as it moved over the Western North Pacific Ocean southeast of Japan.  At 11:00 p.m. EDT on Sunday the center of Typhoon Koguma was located at latitude 29.0°N and longitude 147.6°E which put the center about 655 miles (1060 km) southeast of Tokyo, Japan.  Koguma was moving toward the north at 14 m.p.h. (22 km/h).  The maximum sustained wind speed was 115 m.p.h. (1850 km/h) and there were wind gusts to 145 m.p.h. (235 km/h).  The minimum surface pressure was 954 mb.

Typhoon Koguma weakened on Sunday, but the structure of Koguma was still intact.  A large circular eye with a diameter of 45 miles (75 km) was at the center of Koguma’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 center of Koguma’s circulation.  Storms near the center of Koguma generated upper level divergence that pumped mass away from the typhoon.  The removal of mass in the upper levels was less than the convergence of mass in the lower levels of the atmosphere.  So, the surface pressure increased on Sunday.

The distribution of wind speeds in Typhoon Koguma was fairly symmetrical.  Winds to typhoon force extended out 65 miles (105 km) from the center of Koguma’s circulation.  Winds to tropical storm force extended out 130 miles (210 km) from the center of Typhoon Koguma.

The Hurricane Intensity Index (HII) for Typhoon Koguma is 20.6. The Hurricane Size Index (HSI) is 19.6 and the Hurricane Wind Intensity Size Index (HWISI) is 40.2. Typhoon Koguma is similar in intensity to Hurricane Rita when Rita hit southwest Louisiana in 2005.  Koguma is not as large as Rita was.

Typhoon Koguma will move through an environment that will be unfavorable for intensification during the next 24 hours.  Koguma will move over water where the Sea Surface Temperatures are near 26°C.  It will move under the eastern side of an upper level trough that is over Japan.  The upper level trough will produce southwesterly winds that will blow toward the top of Koguma’s circulation.  Those winds will cause moderate vertical wind shear.  Moderate vertical wind shear and cooler Sea Surface Temperature will cause Typhoon Koguma to continue to weaken on Monday.

The upper level trough over Japan will steer Typhoon Koguma toward the northeast during the next 24 hours.  On its anticipated track, Typhoon Koguma will stay far to the east of Japan.

Typhoon Koguma Intensifies to Equivalent of a Major Hurricane

Typhoon Koguma intensified to the equivalent of a major hurricane east of the Northern Marianas on Friday.  At 11:00 a.m. EDT on Friday the center of Typhoon Koguma was located at latitude 20.5°N and longitude 153.5°E which put the center about 640 miles (1035 km) east-northeast of Saipan.  Koguma was moving toward the west-northwest at 17 m.p.h. (28 km/h).  The maximum sustained wind speed was 115 m.p.h. (185 km/h) and there were wind gusts to 145 m.p.h. (235 km/h).  The minimum surface pressure was 961 mb.

Typhoon Koguma intensified to the equivalent of a major hurricane on Friday as it was completing an eyewall replacement cycle.  A new larger eye was forming at the center of Koguma’s circulation.  Bands of showers and thunderstorms were revolving around the center of Typhoon Koguma.  Storms near the center of Koguma generated upper level divergence that pumped mass away from the typhoon.  The removal of mass caused the surface pressure to decrease.

Even though Typhoon Koguma was completing an eyewall replacement cycle, the circulation around Koguma was still small for a typhoon over the Western North Pacific Ocean.  Winds to typhoon force extended out 45 miles (75 km) from the center of Koguma’s circulation.  Winds to tropical storm force extended out 105 miles (165 km) from the center of Typhoon Koguma.

The Hurricane Intensity Index (HII) for Typhoon Koguma is 20.6.  The Hurricane Size Index (HSI) is 16.2 and the Hurricane Wind Intensity Size Index (HWISI) is 36.8.  Typhoon Koguma is similar in size and intensity to Hurricane Delta when Delta hit Louisiana in 2020.

Typhoon Koguma will move through an environment that will be favorable for intensification during the next 24 hours.  Koguma will move over water where the Sea Surface Temperatures are near 29°C.  It will move under the southwestern part of an upper level ridge that is over the Central North Pacific Ocean.  The upper level ridge will produce southeasterly winds that will blow toward the top of Koguma’s circulation.  Those winds will cause some vertical wind shear, but the wind shear will not be enough to prevent intensification.  Typhoon Koguma will intensify during the next 24 hours.

Typhoon Koguma will move around the southwestern part of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer Koguma toward the northwest during the next 24 hours.  On its anticipated track, Typhoon Koguma will pass northeast of the Northern Marianas.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Nolo continued to weaken gradually far to the southeast of Japan.

At 11:00 a.m. EDT on Friday the center of Tropical Storm Nolo was located at latitude 29.7°N and longitude 147.6°E which put the center about 635 miles (1025 km) southeast of Tokyo, Japan.  Nolo was moving toward the northwest at 13 m.p.h. (21 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 991 mb.

Koguma Strengthens to a Typhoon

Former Tropical Storm Koguma strengthened to a typhoon over the Western North Pacific Ocean east of the Northern Marianas on Thursday.  At 5:00 p.m. EDT on Thursday the center of Typhoon Koguma was located at latitude 18.4°N and longitude 157.1°E which put the center about 810 miles (1310 km) east-northeast of Saipan.  Koguma was moving toward the west-northwest at 14 m.p.h. (22 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 980 mb.

Former Tropical Storm Koguma strengthened to a typhoon on Thursday.  The inner end of a rainband wrapped around the southern side of the center of Koguma’s circulation.  Other bands of showers and thunderstorms were revolving around the center of Typhoon Koguma.  Storms near the center of Koguma generated upper level divergence that pumped mass away from the typhoon.  The removal of mass caused the surface pressure to decrease.

The distribution of wind speeds in Typhoon Koguma was fairly symmetrical.  Winds to typhoon force extended out 30 miles (50 km) from the center of Koguma’s circulation.  Winds to tropical storm force extended out 105 miles (165 km) from the center of Typhoon Koguma.

Typhoon Koguma will move through an environment that will be favorable for intensification during the next 24 hours.  Koguma will move over water where the Sea Surface Temperatures are near 29°C.  It will move under the southwestern part of an upper level ridge that is over the Central North Pacific Ocean.  The upper level ridge will produce easterly winds that will blow toward the top of Koguma’s circulation.  Those winds will cause some vertical wind shear, but the wind shear will not be enough to prevent intensification.  Typhoon Koguma will intensify during the next 24 hours.  Koguma could strengthen to the equivalent of a major hurricane during the weekend.

Typhoon Koguma will move around the southwestern part of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer Koguma toward the west-northwest during the next 24 hours.  On its anticipated track, Typhoon Koguma will pass northeast of the Northern Marianas.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Nolo was weakening gradually far to the southeast of Japan.

At 5:00 p.m. EDT on Thursday the center of Tropical Storm Nolo was located at latitude 28.1°N and longitude 150.6°E which put the center about 855 miles (1380 km) east-southeast of Tokyo, Japan.  Nolo was moving toward the west-northwest 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 991 mb.

Typhoon Nolo Passes North of Wake Island

Typhoon Nolo passed north of Wake Island on Tuesday evening.  At 11:00 p.m. EDT on Tuesday the center of Typhoon Nolo was located at latitude 25.5°N and longitude 162.9°E which put the center about 445 miles (720 km) north of Wake Island.  Nolo was moving toward the west at 25 m.p.h. (40 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 977 mb.

Typhoon Nolo weakened on Tuesday.  The eye was no longer visible at the center of Nolo’s circulation.  The distribution of thunderstorms in Typhoon Nolo became more asymmetrical on Tuesday.  Thunderstorms were still occurring in bands in the southern and eastern parts of Nolo’s circulation.  Bands in the northern and western parts of Typhoon Nolo consisted primarily of showers and lower clouds.  Storms near the center of Nolo generated less upper level divergence that pumped less mass away from the typhoon.  The removal of mass in the upper levels was less than the convergence of mass in the lower levels of the atmosphere.  So, the surface pressure increased on Tuesday.

The circulation around Typhoon Nolo was still large.  Winds to typhoon force extended out 75 miles (120 km) from the center of Nolo’s circulation.  Winds to tropical storm force extended out 205 miles (335 km) from the center of Typhoon Nolo.

Typhoon Nolo will move through an environment that will be unfavorable for intensification during the next 24 hours.  Nolo will move over water where the Sea Surface Temperatures are near 28°C.  It will move under the southern part of an upper level ridge that is over the Western North Pacific Ocean.  The upper level ridge will produce easterly winds that will blow toward the top of Nolo’s circulation.  Those winds will cause moderate vertical wind shear.  Typhoon Nolo will continue to weaken gradually on Wednesday because of the moderate vertical wind shear.

Typhoon Nolo will move around the southern side of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer Nolo toward the west during the next 24 hours.  On its anticipated track, Typhoon Nolo will move northwest of Wake Island on Wednesday.

Elsewhere over the Western North Pacific Ocean, Typhoon Choi-wan was making a transition to a strong extratropical cyclone east of Japan and Tropical Storm Koguma was gradually intensifying south of Wake Island.

At 5:00 p.m. EDT on Tuesday the center of Typhoon Choi-wan was located at latitude 37.9°N and longitude 151.3°E which put the center about 530 miles (855 km) east-southeast of Misawa, Japan.  Choi-wan was moving toward the northeast at 35 m.p.h. (55 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 959 mb.

At 11:00 p.m. EDT on Tuesday the center of Tropical Storm Koguma was located at latitude 15.5°N and longitude 163.6°E which put the center about 325 miles (525 km) south-southwest of Wake Island.  Koguma was moving toward the northwest at 11 m.p.h. (17 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 996 mb.

Typhoon Surigae Intensifies to Equivalent of Major Hurricane

Typhoon Surigae intensified to the equivalent of a major hurricane on Saturday night as it moved over the Western North Pacific Ocean southeast of Okinawa.  At 5:00 a.m. EDT on Sunday the center of Typhoon Surigae was located at latitude 25.7°N and longitude 128.6°E which put the center about 80 miles (130 km) southeast of Okinawa.  Surigae was moving toward the northeast at 11 m.p.h. (17 km/h).  The maximum sustained wind speed was 120 m.p.h. (195 km/h) and there were wind gusts to 150 m.p.h. (240 km/h).  The minimum surface pressure was 952 mb.

Typhoon Surigae intensified to the equivalent of a major hurricane on Saturday night.  A circular eye with a diameter of 20 miles (32 km) was at the center of Surigae’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 center of Typhoon Surigae.  Storms near the center of Surigae generated upper level divergence that pumped mass away from the typhoon.  The removal of mass caused the surface pressure to decrease.

The distribution of wind speed around Typhoon Surigae became more symmetrical when Surigae intensified.  Winds to typhoon force extended out 25 miles (40 km) from the center of Surigae’s circulation.  Winds to tropical storm force extended out 90 miles (145 km) from the center of Typhoon Surigae.

The Hurricane Intensity Index (HII) for Typhoon Surigae is 22.1.  The Hurricane Size Index (HSI) is 9.2 and the Hurricane Wind Intensity Size Index (HWISI) is 31.3.  Typhoon Surigae is similar in size and intensity to Hurricane Zeta when Zeta hit Louisiana in 2020.

Typhoon Surigae will move through an environment that will be somewhat favorable for intensification during the next 24 hours.  Surigae will move over water where the Sea Surface Temperatures are near 28°C.  It will move under the southern part of an upper level trough that is northwest of Japan.  The upper level trough will produce southwesterly winds that will blow toward the top of Surigae’s circulation.  Those winds will cause some vertical wind shear, but the wind shear may not be enough to prevent intensification.  Typhoon Surigae could continue to intensify Sunday.  The vertical wind shear will increase on Monday when Surigae moves closer to the upper level westerly winds in the middle latitudes.  Typhoon Surigae will start to weaken when the vertical wind shear increases.

Typhoon Surigae will move around the western end of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer Surigae toward the northeast during the next 24 hours.  On its anticipated track, the center of Typhoon Surigae will move away Okinawa on Sunday.

Typhoon Surigae will continue to bring strong winds and locally heavy rain to the Ryukyu Islands including Okinawa on Sunday.  Heavy rain is likely to cause flash floods in some locations.  The strong winds and rain will end gradually as Surigae moves away from the Ryukyu Islands.

Typhoon Dujuan Passes Southeast of Honshu

Typhoon Dujuan passed southeast of Honshu on Monday morning.  At 5:00 a.m. EDT on Monday the center of Typhoon Dujuan was located at latitude 34.3°N and longitude 140.8°E which put the center about 110 miles (175 km) south of Tokyo, Japan.  Dujuan was moving toward the northeast at 18 m.p.h. (30 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 971 mb.

Typhoon Dujuan strengthened a little more on Monday morning as it passed southeast of Honshu.  Bands of showers and thunderstorms were revolving around the center of Dujuan’s circulation.  Storms near the center of Dujuan 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 side of Typhoon Dujuan.  Winds to typhoon force extended out 35 miles (55 km) in the eastern side of Dujuan’s circulation.  Winds to tropical storm force extended out 210 miles (335 km) from the center of Typhoon Dujuan.

Typhoon Dujuan will move through an environment that will be somewhat favorable for intensification during the next 12 hours.   Dujuan will move over water where the Sea Surface Temperatures are near 27°C.  It will move under the eastern part 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 Dujuan’s circulation.  Those winds will cause moderate vertical wind shear. The moderate vertical wind shear will inhibit intensification, but the wind shear may not be enough to prevent intensification.  Typhoon Dujuan could intensify a little more during the next 12 hours.  Dujuan will move over cooler Sea Surface Temperatures later on Monday.  Typhoon Dujuan will also into a region where the upper level winds are stronger on Tuesday.  The cooler Sea Surface Temperatures and stronger upper level winds will cause Typhoon Dujuan to weaken.  The cooler water and stronger upper level winds will also cause Dujuan to make a transition to an extratropical cyclone.

The upper level trough that is north of Japan will steer Typhoon Dujuan toward the northeast during the next 24 hours.  On its anticipated track, Typhoon Dujuan will move away from Honshu.

Typhoon Dujuan South of Honshu

The center of Typhoon Dujuan was south of Honshu on Sunday evening.  At 11:00 p.m. EDT on Sunday the center of Typhoon Dujuan was located at latitude 33.0°N and longitude 139.5°E which put the center about 210 miles (335 km) south-southwest of Tokyo, Japan.  Dujuan was moving toward the northeast at 15 m.p.h. (24 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 974 mb.

Former Tropical Storm Dujuan strengthened back to a typhoon as it moved south of Honshu on Sunday evening.  The inner end of a rainband wrapped around the center of Typhoon Dujuan.  Other bands of showers and thunderstorms were revolving around the center of Dujuan’s circulation.  Storms near the center of Dujuan 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 side of Typhoon Dujuan.  Winds to typhoon force extended out 30 miles (50 km) in the eastern side of Dujuan’s circulation.  Winds to tropical storm force extended out 195 miles (315 km) from the center of Typhoon Dujuan.

Typhoon Dujuan will move through an environment that will be somewhat favorable for intensification during the next 24 hours.  Dujuan will move over water where the Sea Surface Temperatures are near 28°C.  It will move under the southern part 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 Dujuan’s circulation.  Those winds will cause moderate vertical wind shear.  The moderate vertical wind shear will inhibit intensification, but the wind shear may not be enough to prevent intensification.  Typhoon Dujuan could intensify on Monday.  Dujuan will move into a region where the upper level winds are stronger on Tuesday.  The stronger upper level winds will cause Typhoon Dujuan to start to weaken.  The stronger upper level winds will also cause Dujuan to make a transition to an extratropical cyclone.

The upper level trough that is north of Japan will steer Tropical Storm Dujuan toward the northeast during the next 24 hours.  On its anticipated track, the center of Tropical Storm Dujuan will pass just south of Tokyo in a few hours.

Tropical Storm Dujuan will bring strong winds and locally heavy rain to Tokyo and eastern Honshu.  Heavy rain could cause floods in some locations.