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Tropical Storm Chan-hom Brings Wind and Rain to Honshu

Tropical Storm Chan-hom brought wind and rain to central Honshu on Tuesday morning.  At 11:00 a.m. EDT on Tuesday the center of Tropical Storm Chan-hom was located at latitude 36.0°N and longitude 139.0°E which put the center about 25 miles (40 km) north of Tokyo, Japan.  Chan-hom was moving toward the west-southwest 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 994 mb.

The center of Tropical Storm Chan-hom crossed the coast of Honshu northeast of Tokyo on Tuesday morning.

The strongest winds were occurring in the northern side of Tropical Storm Chan-hom.  Winds to tropical storm force extended out 45 miles in the northern half of Chan-hom’s circulation.  The winds in the southern half of Tropical Storm Chan-hom were blowing at less than tropical storm force.

An upper level low south of Japan will steer Tropical Storm Chan-hom toward the west during the next 24 hours.  On its anticipated track, the center of Tropical Storm Chan-hom will move across central Honshu.

Tropical Storm Chan-hom will bring gusty winds and locally heavy rain to parts of central Honshu.  Heavy rain could cause floods in some locations.

Elsewhere over the Western North Pacific Ocean, Tropical Depression Peilou continued to weaken slowly northwest of Wake Island.  At 11:00 a.m. EDT on Tuesday the center of Tropical Depression Peilou was located at latitude 26.7°N and longitude 160.1°E which put the center about 645 miles (1035 km) northwest of Wake Island.  Peilou was moving toward the east-northeast at 17 m.p.h. (28 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 999 mb.

Tropical Storm Chan-hom Moves Toward Japan

Tropical Storm Chan-hom was moving toward Japan on Monday morning.  At 11:00 a.m. EDT on Monday the center of Tropical Storm Chan-hom was located at latitude 35.7°N and longitude 147.1°E which put the center about 460 miles (745 km) east of Tokyo, Japan.  Chan-hom was moving toward the northwest at 12 m.p.h. (19 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 981 mb.

The surface center of Tropical Storm Chan-hom is under the eastern part of an upper level low.  The upper level low is producing southeasterly winds that are blowing toward the top of Chan-hom’s circulation.  Those winds are causing moderate vertical wind shear.  The circulation around Tropical Storm Chan-hom is also puling drier air into the southern and eastern parts of Chan-hom’s circulation.

The combination of the moderate vertical wind shear and the drier air is causing the distribution of thunderstorms in Tropical Storm Chan-hom to be asymmetrical.  Thunderstorms are occurring in bands in the western half of Chan-hom’s circulation.  Bands in the eastern part of Tropical Storm Chan-hom consist primarily of showers and lower clouds.  Storm near the enter of Chan-hom generated upper level divergence that pumped mass away from the tropical storm.  The removal of mass caused the surface pressure to decrease.

The distribution of wind speeds in Tropical Storm Chan-hom was also asymmetrical.  Winds to tropical storm force extended out 145 miles (235 km) in the northern half of Chan-hom’s circulation.  Winds to tropical storm force only extended out 70 miles (110 km) in the southern half of Tropical Storm Chan-hom.

Tropical Storm Chan-hom will move through an environment that will be somewhat favorable for intensification during the next 24 hours.  Chan-hom will move over water where the Sea Surface Temperatures are near 26°C.  However, the upper level low just to the west of the low level center of Chan-hom’s circulation will continue to cause moderate vertical wind shear.  Tropical Storm Chan-hom could intensify a little in spite of the moderate vertical wind shear.

The upper level low just to the west of the surface center of Tropical Storm Chan-hom will steer Chan-hom toward the west during the next 24 hours.  On its anticipated track, the center of Tropical Storm Chan-hom will reach the coast of Honshu northeast of Tokyo in about 24 hours.

Tropical Storm Chan-hom will bring strong winds and locally heavy rain to parts of central Honshu.  Heavy rain is likely to cause floods in some locations.

Elsewhere, Tropical Storm Dolphin continued to drop heavy rain over parts of eastern China and former Tropical Storm Peilou weakened to a tropical depression.

At 8:00 a.m. EDT on Monday the center of Tropical Storm Dolphin was located at latitude 29.0°N and longitude 117.9°E which put the center about 60 miles (95 km) southeast of Jingdezhen, China.  Dolphin was moving toward the north-northwest at 10 m.p.h. (16 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 990 mb.

At 11:00 a.m. EDT on Monday the center of Tropical Depression Peilou was located at latitude 22.1°N and longitude 153.6°E which put the center about 195 miles (315 km) south-southwest of Minami Tori Shima.  Peilou was moving toward the northeast at 20 m.p.h. (32 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 993 mb.

Typhoon Dolphin Hits Eastern China

Typhoon Dolphin hit the coast of eastern China near Wenzhou early on Sunday.  At 5:00 a.m. EDT on Sunday the center of Typhoon Dolphin was located at latitude 28.2°N and longitude 121.4°E which put the center about 50 miles (80 km) east of Wenzhou, China.  Dolphin 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 954 mb.

Typhoon Dolphin made landfall on the east coast of China near Wenzhou early on Sunday.  Dolphin was a large typhoon.  Winds to typhoon force extended out 35 miles (55 km) from the enter of Dolphin’s circulation.  Winds to tropical storm force extended out 295 miles (475 km) from the center of Typhoon Dolphin.

The Hurricane Intensity Index (HII) for Typhoon Dolphin is 12.7.  The Hurricane Size Index (HSI) is 16.7 and the Hurricane Wind Intensity Size Index (HWISI) is 29.4.  Typhoon Dolphin is similar in intensity to Hurricane Isaac when Isaac hit southeast Louisiana in 2012.  Typhoon Dolphin is much larger than Isaac was.

Typhoon Dolphin 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 Dolphin toward the west-northwest during the next 24 hours.  On its anticipated track, the center of Typhoon Dolphin will continue to move farther inland over eastern China during the next 24 hours.

Typhoon Dolphin will bring strong winds and heavy rain to parts of eastern China.  Dolphin will bring strong winds and heavy rain to Zhejiang, Anhui, and Jiangsu.  Heavy rain is likely to cause floods in some locations.  Typhoon Dolphin could also produce a storm surge of up to 10 feet (3 meters) along parts of the east coast of China.

Even though Typhoon Dolphin will weaken as it moves farther inland, Dolphin could also drop heavy rain over parts of Henan, Shandong, Hebei, and Shanxi as it moves farther inland.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Chan-hom was still churning east of Japan and Tropical Storm Peilou formed south of Iwo To.

At 5:00 a.m. EDT on Sunday the center of Tropical Storm Chan-hom was located at latitude 32.4°N and longitude 150.5°E which put the center about 650 miles (1050 km) east-southeast of Tokyo, Japan.  Chan-hom was moving toward the west-northwest at 4 m.p.h. (6 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 984 mb.

At 5:00 a.m. EDT on Sunday the center of Tropical Storm Peilou was located at latitude 21.0°N and longitude 143.6°E which put the center about 265 miles (425 km) south-southeast of Iwo To.  Peilou was moving toward the east-southeast at 15 m.p.h. (24 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.

Typhoon Dolphin Continues Toward Okinawa

Typhoon Dolphin continued to move toward Okinawa on Wednesday.  At 11:00 p.m. EDT on Wednesday the center of Typhoon Dolphin was located at latitude 26.3°N and longitude 132.9°E which put the center about 355 miles (570 km) east of Okinawa.  Dolphin was moving toward the west at 15 m.p.h. (24 km/h).  The maximum sustained wind speed was 90 m.p.h. (145 km/h) and there were wind gusts to 115 m.p.h. (185 km/h).  The minimum surface pressure was 956 mb.

Typhoon Dolphin weakened slowly on Wednesday.  The circulation around Dolphin pulled some drier air close to the core of the typhoon.  The drier air caused thunderstorms in some parts of Typhoon Dolphin to weaken.

There was still a small circular eye at the center of Typhoon Dolphin.  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 still were revolving around the core of Dolphin’s circulation.  There were wider areas of clear air in between the rainbands.  Storms near the core of Dolphin 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 Wednesday.

The circulation around Typhoon Dolpin was still large on Wednesday.  Winds to typhoon force extended out 140 miles (220 km) from the center of Dolphin’s circulation.  Winds to tropical storm force extended out 305 miles (490 km) from the center of Typhoon Dolphin.

The Hurricane Intensity Index (HII) for Typhoon Dolphin is 13.9.  The Hurricane Size Index (HSI) is 44.7 and the Hurricane Wind Intensity Size Index (HWISI) is 58.6. Typhoon Dolphin is similar in intensity to Hurricane Sandy was when Sandy hit the East Coast of the U.S. in 2012.  Typhoon Dolphin is not quite as big as Sandy was.

Typhoon Dolphin will move through an environment that will be favorable for a strong typhoon during the next 24 hours.  Dolphin will move over water where the Sea Surface Temperatures are near 30°C.  It will move under the middle of an upper level ridge that is over the Western North Pacific Ocean.  The upper level winds are weak near the middle of the ridge and there will be little vertical wind shear.  However, the drier air being pulled into Dolphin’s circulation will inhibit intensification.  Typhoon Dolphin is likely to maintain its intensity on Thursday.

Typhoon Dolphin 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 Dolphin toward the west during the next 24 hours.  On its anticipated track, the center of Typhoon Dolphin will be near Minami Daito Jima in 12 hours. The center of Typhoon Dolpin will approach Okinawa in 24 hours,

Typhoon Dolphin will bring strong winds and heavy rain to Minami Daito Jima and to the central Ryukyu Islands including Okinawa later this week.  Heavy rains are likely to cause flash floods in some locations.  Typhoon Dolphin could also cause a storm surge of up to 10 feet (3 meters) along the coast of some of the islands.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Kujira dropped heavy rain on parts of Luzon.  Kujira weakened to a tropical depression after the center moved over Luzon.  At 11:00 p.m. EDT on Wednesday the center of Tropical Depression Kujira was located at latitude 17.3°N and longitude 121.6°E which put the center about 25 miles (40 km) northwest of Cauayan, Philippines.  Kujira was moving toward the east-southeast 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 997 mb.

 

Typhoon Dolphin Moves Toward Okinawa

Typhoon Dolphin moved toward Okinawa on Tuesday.  At 11:00 p.m. EDT on Tuesday the center of Typhoon Dolphin was located at latitude 25.5°N and longitude 137.7°E which put the center about 655 miles (1055 km) east of Okinawa.  Dolphin was moving toward the west at 11 m.p.h. (17 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 943 mb.

The intensity of Typhoon Dolphin fluctuated a little on Tuesday, but Dolphin ended the day as strong as it was when the day started.  A circular eye with a diameter of 25 miles (40 km) was at the center of Dolphin’s circulation.  The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms.

Typhoon Dolphin appeared to pull some drier air into its circulation on Tuesday.  Bands of showers and thunderstorms still were revolving around the core of Dolphin’s circulation.  However, there were wider areas of clear air in between the rainbands.  Storms near the core of Dolphin generated strong upper level divergence that pumped mass away from the typhoon.  The removal of mass in the upper levels was nearly equal to the convergence of mass in the lower levels of the atmosphere.  So, the surface pressure did not change much again on Tuesday.

The circulation around Typhoon Dolpin got even larger on Tuesday.  Winds to typhoon force extended out 130 miles (210 km) from the center of Dolphin’s circulation.  Winds to tropical storm force extended out 290 miles (465 km) from the center of Typhoon Dolphin.

The Hurricane Intensity Index (HII) for Typhoon Dolphin is 20.6.  The Hurricane Size Index (HSI) is 40.6 and the Hurricane Wind Intensity Size Index (HWISI) is 61.2.  Typhoon Dolphin is similar in intensity to Hurricane Irma was when Irma hit South Florida in 2017.  Typhoon Dolphin is much larger than Irma was.

Typhoon Dolphin will move through an environment that will be favorable for a powerful typhoon during the next 24 hours.  Dolphin 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 over the Western North Pacific Ocean.  The upper level winds are weak near the middle of the ridge and there will be little vertical wind shear.  Typhoon Dolphin is likely to maintain its intensity on Wednesday unless another eyewall replacement cycle occurs.

Typhoon Dolphin 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 Dolphin toward the west during the next 24 hours.  On its anticipated track, the center of Typhoon Dolphin will be near Minami Daito Jima in less than 36 hours.  The center of Typhoon Dolpin will be near Okinawa in 48 hours,

Typhoon Dolphin will bring strong winds and heavy rain to Minami Daito Jima and to the central Ryukyu Islands including Okinawa later this week.  Heavy rains are likely to cause flash floods in some locations.  Typhoon Dolphin could also cause a storm surge of up to 10 feet (3 meters) along the coast of some of the islands.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Kujira formed west of Luzon.  At 11:00 p.m. EDT on Tuesday the center of Tropical Storm Kujira was located at latitude 17.6°N and longitude 119.0°E which put the center about 260 miles (420 km) northwest of Manila, Philippines.  Kujira was moving toward the west-northwest at 3 m.p.h. (5 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.

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 Krosa Passes East of Japan

Tropical Storm Krosa passed east of Japan on Friday.  At 11:00 p.m. EDT on Friday the center of Tropical Storm Krosa was located at latitude 36.8°N and longitude 143.4°E which put the center about 130 miles (210 km) east-northeast of Tokyo, Japan.  Krosa was moving toward the north-northeast at 16 m.p.h. (26 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.

Tropical Storm Krosa passed east of Japan on Friday.  Even though Krosa was a tropical storm, there was a clear area at the center of its circulation.  The clear area was surrounded by a broken ring of thunderstorms.  The strongest winds were occurring in that broken ring of storms.  Thunderstorms were occurring in bands in the eastern side of Tropical Storm Krosa. Bands in the western side of Krosa’s circulation consisted primarily of showers and lower clouds.

The distribution of wind speeds in Tropical Storm Krosa was more symmetrical on Friday.  Winds to tropical storm force extended out 115 miles (185 km) from the center of Krosa’s circulation.

Tropical Storm Krosa will move through an environment unfavorable for the intensification of a tropical cyclone during the next 24 hours.  Krosa 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 north of Japan.  The upper level trough will produce southwesterly winds that will cause moderate vertical wind shear.  Cooler Sea Surface Temperatures and moderate vertical wind shear will cause Tropical Storm Krosa to start a transition to an extratropical cyclone during the next 24 hours.

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

Elsewhere over the Western North Pacific Ocean, Tropical Depression 13W formed south of Japan.  At 11:00 p.m. EDT on Friday the center of Tropical Depression 13W was located at latitude 28.1°N and longitude 137.5°E which put the center about 325 miles (520 km) west-northwest of Iwo To.  Tropical Depression 13W was moving toward the northeast 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 998 mb.

Typhoon Koinu Moves Toward Hong Kong

Typhoon Koinu moved toward Hong Kong on Thursday. At 11:00 p.m. EDT on Thursday the center of Typhoon Koinu was located at latitude 21.5°N and longitude 117.4°E which put it about 225 miles (365 km) east of Hong Kong. Koinu was moving toward the west at 8 m.p.h. (13 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 967 mb.

Typhoon Koinu moved over the South China Sea toward Hong Kong on Thursday. Koinu was weaker and smaller after passing over southern Taiwan on Wednesday. The circulation around Typhoon Koinu started to exhibit more organization again on Thursday evening. A circular eye with a diameter of 18 miles (30 km) was at the center of Koinu’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 Koinu. Storms near the core generated upper level divergence that pumped mass away from the typhoon.

Wins to typhoon force extended out 35 miles (55 km) from the center of Typhoon Koinu. Winds to tropical storm force extended out 285 miles (460 km) in the northeast quadrant of Koinu’s circulation. Winds to tropical storm force extended out 130 miles (210 km) in the other parts of Typhoon Koinu.

Typhoon Koinu will move through an environment somewhat favorable for intensification during the next 24 hours. Koinu 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 over China. The ridge will produce easterly winds that will blow toward the top of Koinu’s circulation. Those winds will cause some vertical wind shear. The wind shear will inhibit intensification but the shear may not be strong enough to prevent intensification. The circulation around the northern side of Typhoon Koinu could start to draw in some drier air from China. Typhoon Koinu could intensify during the next 24 hours if the drier air does not reach the inner core of the circulation.

Typhoon Koinu will move will move around the southern part of a high pressure system over eastern Asia and the Western North Pacific Ocean. The high pressure system will steer Koinu toward the west during the next 24 hours. On its anticipated track the center Typhoon Koinu will move closer to Hong Kong on Friday.

Typhoon Hinnamnor Strengthens Back to Equivalent of Cat. 5 Hurricane

Typhoon Hinnamnor strengthened back to the equivalent of a Category 5 hurricane on the Saffir-Simpson southeast of the southern Ryukyu Islands on Wednesday night. At 11:00 p.m. EDT on Wednesday the center of Typhoon Hinnamnor was located at latitude 22.4°N and longitude 125.7°E which put it about 165 miles (270 km) southeast of Ishigaki, Japan. Hinnamnor was moving toward the south-southwest at 17 m.p.h. (28 km/h). The maximum sustained wind speed was 160 m.p.h. (260 km/h) and there were wind gusts to 195 m.p.h. (315 km/h). The minimum surface pressure was 915 mb.

Typhoon Hinnamnor intensified back to the equivalent of a Category 5 hurricane after the completion of an eyewall replacement cycle southeast of the southern Ryukyu Islands. A circular eye with a diameter of 20 miles (32 km) was at the center of Hinnamnor. 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 Hinnamnor. Storms near the core generated strong upper level divergence that pumped large quantities of mass away from the typhoon.

The circulation around Typhoon Hinnamnor began to contract again after the completion of the eyewall replacement cycle. Winds to typhoon force extended out 45 miles (75 km) from the center of Hinnamnor. Winds to tropical storm force extended out 100 miles (160 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon Hinnamnor was 35.0. The Hurricane Size Index (HSI) was 15.1 and the Hurricane Wind Intensity Size Index (HWISI) was 50.1. Hinnamnor was capable of causing regional catastrophic damage.

Typhoon Hinnamnor will move through an environment capable of supporting a strong typhoon during the next 24 hours. Hinnamnor will move over water where the Sea Surface Temperatures are 30˚C. It will move through region where the upper level winds are weak and there there will be little vertical wind shear. Typhoon Hinnamnor could maintain its intensity during the next 24 hours unless concentric eyewalls form again.

Typhoon Hinnamnor will finish absorbing the circulation of Tropical Depression 13W that is located southeast of Okinawa during the next 24 hours. At 11:00 p.m. EDT on Wednesday the center of Tropical Depression 13W was located at at latitude 24.5°N and longitude 129.0°E which put it about 185 miles (300 km) southeast of Okinawa. The tropical depression was moving toward the northwest at 17 m.p.h. (28 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 1003 mb.

Typhoon Hinnamnor will moved toward the southwest during the next 24 hours as it finishes the absorption of Tropical Depression 13W. On its anticipated track, Typhoon Hinnamnor will move south of the southern Ryukyu Islands during the next 24 hours. Hinnamnor could be in an area where the steering winds are weak after it absorbs the tropical depression. Typhoon Hinnamnor could start to move toward the north back toward the southern Ryukyu Islands on Friday.

Typhoon Hinnamnor Moves South of Okinawa

Typhoon Hinnamnor moved south of Okinawa on Wednesday. At 11:00 a.m. EDT on Wednesday the center of Typhoon Hinnamnor was located at latitude 24.4°N and longitude 127.3°E which put it about 115 miles (185 km) south of Okinawa. Hinnamnor was moving toward the west-southwest at 15 m.p.h. (24 km/h). The maximum sustained wind speed was 145 m.p.h. (230 km/h) and there were wind gusts to 175 m.p.h. (280 km/h). The minimum surface pressure was 929 mb.

Concentric eyewalls developed at the center of Typhoon Hinnamnor on Tuesday night. The original eye with a diameter of 10 miles (16 km) was still present at the center of Hinnamnor. The inner end of a rainband wrapped around the original eye and eyewall. An outer eye with a diameter of 60 miles (95 km) surrounded the original eye and eyewall. Typhoon Hinnamnor weakened slightly as the winds in the inner eyewall decreased slightly. The core of Hinnamnor still generated strong upper level divergence that pumped mass away from the typhoon.

The size of the circulation around Typhoon Hinnamnor increased when the concentric eyewalls developed. Winds to typhoon force extended out 35 miles (55 km) from the center of Hinnamnor. Winds to tropical storm force extended out 120 miles (195 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon Hinnamnor was 29.9. The Hurricane Size Index (HSI) was 13.4 and the Hurricane Wind Intensity Size Index (HWISI) was 43.3. Hinnamnor was capable of causing regional severe damage.

Typhoon Hinnamnor will move through an environment capable of supporting a strong typhoon during the next 24 hours. Hinnamnor will move over water where the Sea Surface Temperatures are 30˚C. It will move through region where the winds at all levels of the troposphere are blowing from the east. Since the winds at different levels are blowing from the same direction, there will be little vertical wind shear. Even though it will be in a favorable environment, Typhoon Hinnamnor will weaken as the inner eyewall weakens because of the eyewall replacement cycle. More of the low level inflow will become concentrated in the outer eyewall. Hinnamnor could strengthen again after the eyewall replacement cycle is completed.

Typhoon Hinnamnor will interact with Tropical Depression 13W that is located southeast of Okinawa during the next 24 hours. At 11:00 a.m. EDT on Wednesday morning center of Tropical Depression 13W was located at at latitude 22.6°N and longitude 131.6°E which put it about 400 miles (640 km) southeast of Okinawa. The tropical depression was moving toward the north-northwest at 14 m.p.h. (22 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.

Typhoon Hinnamnor will moved toward the southwest during the next 24 hours as it moves around the western side of Tropical Depression 13W. On its anticipated track, Typhoon Hinnamnor will move south of the southern Ryukyu Islands. The much stronger circulation around Typhoon Hinnamnor will eventually absorb the weaker tropical depression. Hinnamnor could be in an area where the steering winds are weak after it absorbs the tropical depression. Typhoon Hinnamnor could meander near the southern Ryukyu Islands later this week.