Tag Archives: Iwo To

Typhoon Nolo Moves Northeast of Wake Island

Typhoon Nolo moved northeast of Wake Island on Monday evening.  At 11:00 p.m. EDT on Monday the center of Typhoon Nolo was located at latitude 25.7°N and longitude 172.0°E which put the center about 600 miles (970 km) northeast of Wake Island.  Nolo was moving toward the west at 17 m.p.h. (28 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 955 mb.

Typhoon Nolo did not change much on Monday.  A circular eye with a diameter of 30 miles (50 km) was at the center of Nolo’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 Nolo.  Storms near the center of Nolo generated 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 on Monday.

The distribution of wind speeds around Typhoon Nolo was fairly symmetrical.  Winds to typhoon force extended out 50 miles (80 km) from the center of Nolo’s circulation.  Winds to tropical storm force extended out 155 miles (250 km) from the center of Typhoon Nolo.

The Hurricane Intensity Index (HII) for Typhoon Nolo is 22.1.  The Hurricane Size Index (HSI) is 16.1 and the Hurricane Wind Intensity Size Index (HWISI) is 38.2.  Typhoon Nolo is similar in size and intensity to Hurricane Milton, when Milton hit Florida in 2024.

Typhoon Nolo will move through an environment that will be somewhat 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 northeasterly winds that will blow toward the top of Nolo’s circulation.  Those winds will cause moderate vertical wind shear.  Typhoon Nolo is likely to weaken gradually on Tuesday 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 pass north of Wake Island on Tuesday.

Elsewhere over the Western North Pacific Ocean, Typhoon Choi-wan weakened gradually northeast of Iwo To and Tropical Storm Koguma strengthened slowly north of Kwajalein.

At 11:00 p.m. EDT on Monday the center of Typhoon Choi-wan was located at latitude 30.8°N and longitude 146.3°E which put the center about 440 miles (710 km) northeast of Iwo To.  Choi-wan was moving toward the north at 16 m.p.h. (26 km/h).  The maximum sustained wind speed was 110 m.p.h. (175 km/h) and there were wind gusts to 130 m.p.h. (210 km/h).  The minimum surface pressure was 945 mb.

At 11:00 p.m. EDT on Monday the center of Tropical Storm Koguma was located at latitude 13.2°N and longitude 166.7°E which put the center about 295 miles (475 km) north of Kwajalein. Koguma was moving toward the northwest at 11 m.p.h. (17 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 995 mb.

Typhoon Choi-wan Passes East of Iwo To

Typhoon Choi-wan passed east of Iwo To on Sunday.  At 11:00 p.m. EDT on Sunday the center of Typhoon Choi-wan was located at latitude 25.7°N and longitude 146.4°E which put the center about 325 miles (525 km) east of Iwo To.  Choi-wan was moving toward the northwest at 12 m.p.h. (19 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 916 mb.

Typhoon Choi-wan intensified to the equivalent of a Category 4 hurricane on the Saffir-Simpson Scale on Sunday.  An eyewall replacement cycle appeared to be starting in Typhoon Choi-wan.  A circular eye with a diameter of 20 miles (32 km) was at the center of Choi-wan’s circulation.  The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms.  The inner end of a rainband wrapped around the existing eye and eyewall.  A larger outer eyewall appeared to be forming around the existing eye and eyewall.  Bands of showers and thunderstorms were revolving around the core of Typhoon Choi-wan.  Storms near the core of Choi-wan generated upper level divergence that pumped mass away from the typhoon.  The removal of mass caused the surface pressure to decrease.

The circulation around Typhoon Choi-wan was large.  Winds to typhoon force extended out 80 miles (130 km) from the center of Choi-wan’s circulation.  Winds to tropical storm force extended out 355 miles (575 km) from the center of Typhoon Choi-wan.

The Hurricane Intensity Index (HII) for Typhoon Choi-wan is 31.6.  The Hurricane Size Index (HSI) is 27.4 and the Hurricane Wind Intensity Size Index (HWISI) is 59.0.  Typhoon Choi-wan is similar in intensity to Hurricane Laura when Laura hit Southwest Louisiana in 2020.  Typhoon Choi-wan is much larger than Hurricane Laura was.

Typhoon Choi-wan will move through an environment that will be favorable for intensification during the next 24 hours.  Choi-wan 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.  Even though Typhoon Choi-wan will move through a favorable environment, Choi-wan is likely to weaken during the next 24 hours because of the eyewall replacement cycle.

Typhoon Choi-wan 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 Choi-wan toward the north during the next 24 hours.  On its anticipated track, the center of Typhoon Choi-wan will pass east of Japan during the next few days.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Koguma formed north of Kwajalein and former Hurricane Nolo moved west of the International Date Line.  Nolo is now designated as Typhoon Nolo because it is over the Western North Pacific Ocean.

At 11:00 p.m. EDT on Sunday the center of Tropical Storm Koguma was located at latitude 10.8°N and longitude 168.0°E which put the center about 125 miles (200 km) north of Kwajalein. Koguma was moving toward the northeast at 11 m.p.h. (17 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 1002 mb.

At 11:00 p.m. EDT on Sunday the center of Typhoon Nolo was located at latitude 25.0°N and longitude 178.6°W which put the center about 315 miles (510 km) southwest of Midway Island.  Nolo was moving toward the west-northwest at 18 m.p.h. (30 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 955 mb.

Typhoon Choi-wan Intensifies to Equivalent of a Major Hurricane

Typhoon Choi-wan intensified to the equivalent of a major hurricane as it moved east-southeast of Iwo To on Saturday.  At 11:00 p.m. EDT on Saturday the center of Typhoon Choi-wan was located at latitude 22.5°N and longitude 147.1°E which put the center about 410 miles (665 km) east-southeast of Iwo To.  Choi-wan was moving toward the north-northeast at 16 m.p.h. (26 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 942 mb.

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

The circulation around Typhoon Choi-wan was large.  Winds to typhoon force extended out 90 miles (145 km) from the center of Choi-wan’s circulation.  Winds to tropical storm force extended out 355 miles (575 km) from the center of Typhoon Choi-wan.

The Hurricane Intensity Index (HII) for Typhoon Choi-wan is 23.6.  The Hurricane Size Index (HSI) is 28.8 and the Hurricane Wind Intensity Size Index (HWISI) is 52.4.  Typhoon Choi-wan is similar in size and intensity to Hurricane Wilma when Wilma hit South Florida in 2005.

Typhoon Choi-wan will move through an environment that will be favorable for intensification during the next 24 hours.  Choi-wan Choi-wan will move over water where the Sea Surface Temperatures are near 28°C.  It will move through a region where the upper level winds are weak and there will be little vertical wind shear.  Typhoon Choi-wan is likely to continue to  intensify during the next 24 hours unless an eyewall replacement cycle occurs.

Typhoon Choi-wan 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 Choi-wan toward the north during the next 24 hours.  On its anticipated track, the center of Typhoon Choi-wan will pass east of Iwo To on Sunday.

Dujuan Strengthens to a Typhoon

Former Tropical Storm Dujuan strengthened to a typhoon on Friday as it moved over the Western North Pacific Ocean northwest of Iwo To.  At 11:00 p.m. EDT on Friday the center of Typhoon Dujuan was located at latitude 26.5°N and longitude 139.4°E which put the center about 140 miles (225 km) northwest of Iwo To.  Dujuan was moving toward the west-northwest at 9 m.p.h. (15 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 978 mb.

Former Tropical Storm Dujuan strengthened to a typhoon on Friday.  The inner end of a rainband wrapped around the southern and eastern side of the center of Typhoon Dujuan.  Thunderstorms were occurring in bands in the northern side of Dujuan’s circulation.  Bands in the southern side of Typhoon Dujuan consisted primarily of showers and lower clouds.  Storms near the center of Dujuan generated upper level divergence that pumped mass away from the typhoon.  The removal of mass caused the surface pressure to decrease.

The strongest winds were occurring close to the center of Typhoon Dujuan.  Winds to typhoon force extended out 20 miles (30 km) from the center of Dujuan’s circulation.  Winds to tropical storm force extended out 250 miles (400 km) in the northern side of Typhoon Dujuan.  Winds to tropical storm force extended out 140 miles (225 km) in the southern half of Dujuan’s circulation.

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 western part of an upper level ridge that is southeast of Japan.  The upper level ridge will produce southerly 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 24 hours.

Typhoon Dujuan 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 Dujuan toward the northwest during the next 24 hours.  On its anticipated track, Typhoon Dujuan will move closer to Honshu during the weekend.

Tropical Storm Dujuan Moves East of Iwo To

Tropical Storm Dujuan moved east of Iwo To on Thursday.  At 11:00 p.m. EDT on Thursday the center of Tropical Storm Dujuan was located at latitude 25.3°N and longitude 143.8°E which put the center about 200 miles (325 km) east of Iwo To.  Dujuan was moving toward the west at 17 m.p.h. (28 km/h).  The maximum sustained wind speed was 70 m.p.h. (110 km/h) and there were wind gusts to 85 m.p.h. (135 km/h).  The minimum surface pressure was 981 mb.

Tropical Storm Dujuan strengthened on Thursday as it moved over the Western North Pacific Ocean east of Iwo To.  More thunderstorms developed near the center of Dujuan’s circulation.  Thunderstorms were also occurring in bands in the northern side of Tropical Storm Dujuan.  Bands in the southern half of Dujuan’s circulation consisted primarily of showers and lower clouds.  Storms near the center of Dujuan 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 Dujuan was large.  Winds to tropical storm force extended out 290 miles (465 km) from the center of Dujuan’s circulation.

Tropical Storm 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 northern part of an upper level low that is south of Iwo To.  The upper level low will produce easterly 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.  Tropical Storm Dujuan could intensify to a typhoon during the next 24 hours.

The upper level low that is south of Iwo To will pull Tropical Storm Dujuan toward the west during the next 24 hours.  On its anticipated track, the center of Tropical Storm Dujuan will pass north of Iwo To on Friday.

Tropical Storm Dujuan will bring gusty winds and locally heavy rain to Iwo To on Friday.

Tropical Storm Dujuan Forms Northeast of Marianas

Tropical Storm Dujuan formed over the Western North Pacific Ocean northeast of the Marianas on Wednesday.  At 11:00 a.m. EDT on Wednesday the center of Tropical Storm Dujuan was located at latitude 17.3°N and longitude 149.5°E which put the center about 260 miles (420 km) east-northeast of Saipan.  Dujuan was moving toward the north-northeast 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 994 mb.

A low pressure system over the Western North Pacific Ocean northeast of the Marianas strengthened on Wednesday and the Japan Meteorological Agency designated the system as Tropical Storm Dujuan.

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

The strongest winds were occurring in the southern part of Tropical Storm Dujuan.  Winds to tropical storm force extended out 150 miles (240 km) in the southern side of Dujuan’s circulation.  The winds in the northern half of Tropical Storm Dujuan were blowing at less than tropical storm force.

Tropical Storm 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 southeastern part of an upper level low that is north of the Marianas.  The upper level low 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.  Tropical Storm Dujuan is likely to intensify gradually during the next 24 hours.

The upper level low that is north of the Marianas will pull Tropical Storm Dujuan toward the north during the next 24 hours.  On its anticipated track, Tropical Storm Dujuan will move north of the Marianas.  The center of Dujuan could be near Iwo To in 48 hours.

Typhoon Saudel Strengthens to Equivalent of a Major Hurricane

Typhoon Saudel strengthened to the equivalent of a major hurricane on Saturday at it moved west of the Marianas.  At 11:00 a.m. EDT on Saturday the center of Typhoon Saudel was located at latitude 20.0°N and longitude 144.2°E which put the center about 80 miles (130 km) west of Agrihan.  Saudel was moving toward the northwest at 14 m.p.h. (22 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 956 mb.

Typhoon Saudel strengthened to the equivalent of a major hurricane on Saturday.  A circular eye with a diameter of 18 miles (30 km) was at the center of Saudel’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 Saudel.  Storms near the center of Saudel generated upper level divergence that pumped mass away from the typhoon.  The removal of mass caused the surface pressure to decrease.

The size of the circulation around Typhoon Saudel increased when Saudel strengthened.  Winds to typhoon force extended out 45 miles (75 km) from the center of Saudel’s circulation.  Winds to tropical storm force extended out 160 miles (260 km) from the center of Typhoon Saudel.

The Hurricane Intensity Index (HII) for Typhoon Saudel is 22.1.  The Hurricane Size Index (HSI) is 18.6 and the Hurricane Wind Intensity Size Index (HWISI) is 40.7.  Typhoon Saudel is similar in size and intensity to Hurricane Milton when Milton hit Florida in 2024.

Typhoon Saudel will move through an environment that will be very favorable for intensification during the next 24 hours.  Saudel 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 Saudel will intensify during the next 24 hours.  Saudel could intensify rapidly at times.  Typhoon Saudel could strengthen to the equivalent of a Category 5 hurricane during the next 36 hours.

Typhoon Saudel 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 Saudel toward the northwest during the next 24 hours.  On its anticipated track, the center of Typhoon Saudel will pass south of Iwo To in 18 hours.  Saudel could approach the Ryukyu Islands in three days.

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 Approaches Iwo To

Typhoon Dolphin was approaching Iwo To on Sunday night.  At 11:00 p.m. EDT on Sunday the center of Typhoon Dolphin was located at latitude 24.5°N and longitude 147.8°E which put the center about 445 miles (720 km) east of Iwo To.  Dolphin was moving toward the west-northwest at 12 m.p.h. (19 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.

Typhoon Dolphin appeared to be in the middle of another eyewall replacement cycle on Sunday evening.  A small circular eye was at the center of Dolphin’s circulation.  The eye was surrounded a ring of thunderstorms and the strongest winds occurred in that ring of storms.  A second larger ring of thunderstorms with a diameter of 35 miles (55 km) surrounded the inner eye and eyewall.  Bands of showers and thunderstorms revolved around the core of Typhoon Dolphin.  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 less than the convergence of mass in the lower levels of the atmosphere.  So, the surface pressure started to increase again on Sunday.

Multiple eyewall replacement cycles were having an effect on the structure of Typhoon Dolphin.   Winds to typhoon force extended out 90 miles (145 km) in the northern side of Dolphin’s circulation.  Winds to typhoon force only extended out 35 miles in the southern side of Typhoon Dolphin.  Winds to tropical storm force extended out 265 miles (425 km) from the center of Dolphin’s circulation.

The Hurricane Intensity Index (HII) for Typhoon Dolphin is 20.6.  The Hurricane Size Index (HSI) is 25.5 and the Hurricane Wind Intensity Size Index (HWISI) is 46.1.  Typhoon Dolphin is similar in size and intensity to Hurricane Irma was when Irma hit South Florida in 2017.

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 weaken a little on Monday. as it completes the current eyewall replacement cycle.

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 reach Iwo To in 24 hours.  The center of Dolphin’s circulation will approach Minami Daito Jima in three days.  The center of Typhoon Dolpin will be near Okinawa To in 4 days,

Typhoon Dolphin will bring strong winds and heavy rain to Iwo To.  Heavy rain is likely to cause flash floods.  Typhoon Dolphin will be capable of causing major damage.

Typhoon Dolphin Still Moving Toward Iwo To

Typhoon Dolphin was still moving toward Iwo on Saturday evening.  At 11:00 p.m. EDT on Saturday the center of Typhoon Dolphin was located at latitude 22.9°N and longitude 152.8°E which put the center about 785 miles (1265 km) east of Iwo To.  Dolphin was moving toward the west-northwest at 16 m.p.h. (26 km/h).  The maximum sustained wind speed was 145 m.p.h. (235 km/h) and there were wind gusts to 175 m.p.h. (280 km/h).  The minimum surface pressure was 931 mb.

Typhoon Dolphin’s intensity fluctuated a little on Saturday, but Dolphin essentially maintained it strength.  A circular eye with a diameter of 35 miles (55 km) was at the center of Dolphin’s circulation.  The eye was surrounded a ring of thunderstorms and the strongest winds occurred in that ring of storms.  Bands of showers and thunderstorms revolved around the core of Typhoon Dolphin.  Storms near the core of Dolphin generated strong upper level divergence that pumped large amounts of mass from the typhoon.  The removal of large amounts of mass in the upper levels was nearly the same as the convergence of mass in the lower levels of the atmosphere.  So, the surface pressure remained almost constant on Saturday.

The completion of multiple eyewall replacement cycles caused the circulation around Typhoon Dolphin to become very large.  Winds to typhoon force extended out 90 miles (145 km) from the center of Dolphin’s circulation.   Winds to tropical storm force extended out 275 miles (445 km) from the center of Typhoon Dolphin.

The Hurricane Intensity Index (HII) for Typhoon Dolphin is 29.9. The Hurricane Size Index (HSI) is 26.7 and the Hurricane Wind Intensity Size Index (HWISI) is 56.6.  Typhoon Dolphin is bigger and stronger than Hurricane Helene was when Helene hit Florida in 2022.

Typhoon Dolphin will move through an environment 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 Sunday.  Eyewall replacement cycles are likely to continue to cause fluctuation in the intensity of Typhoon Dolphin during the next several days.

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 toward Iwo To.  The center of Dolphin will be near Iwo To in 48 hours,