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Typhoon In-Fa Rapidly Intensifies to Equivalent of a Major Hurricane

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Typhoon In-Fa rapidly intensified to the equivalent of a major hurricane on Monday over the Western North Pacific Ocean east of the Northern Marianas.  At 11:00 a.m. EDT on Monday the center of Typhoon In-Fa was located at latitude 14.1°N and longitude 162.6°E which put the center about 1135 miles (1830 km) east of Saipan.  In-Fa was moving toward the west-northwest at 4 m.p.h. (6 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 946 mb.

Typhoon In-Fa rapidly intensified to the equivalent of a major hurricane on Monday.  A small circular eye with a diameter of 8 miles (13 km) formed at the center of In-Fa’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 In-Fa.  Storms near the center of In-Fa 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 In-Fa was small.  Winds to typhoon force extended out 30 miles (50 km) from the center of In-Fa’s circulation.  Winds to tropical storm force extended out 80 miles (130 km) from the center of Typhoon In-Fa.

The Hurricane Intensity Index (HII) for Typhoon In-Fa is 25.1.  The Hurricane Size Index (HSI) is 9.6 and the Hurricane Wind Intensity Size Index (HWISI) is 34.7.  Typhoon In-Fa is similar in size and intensity to Hurricane Harvey when Harvey hit Texas in 2017.

Typhoon In-Fa will move through an environment that will be favorable for intensification during the next 24 hours.  In-Fa 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 In-Fa could continue to intensify during the next 24 hours unless the inner end of a rainband wraps around the existing eye and eyewall.  If concentric eyewalls form, then an eyewall replacement cycle could cause In-Fa to weaken.

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

 

In-Fa Strengthens to a Typhoon

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Former Tropical Storm In-Fa strengthened to a typhoon on Sunday as it moved over the Western North Pacific Ocean northwest of Kwajalein.  At 5:00 p.m. EDT on Sunday the center of Typhoon In-Fa was located at latitude 13.6°N and longitude 163.7°E which put the center about 420 miles (675 km) northwest of Kwajalein.  In-Fa was moving toward the northwest at 9 m.p.h. (15 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 979 mb.

Former Tropical Storm In-Fa strengthened to a typhoon on Sunday.  The inner end of a rainband wrapped around the center of In-Fa’s circulation.  Bands of showers and thunderstorms were revolving around the center of Typhoon In-Fa.  Storms near the center of In-Fa 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 In-Fa was small.  Winds to typhoon force extended out 20 miles (30 km) from the center of Typhoon In-Fa.  Winds to tropical storm force extended out 80 miles (130 km) from the center of Typhoon In-Fa.

Typhoon In-Fa will move through an environment that will be somewhat favorable for intensification during the next 24 hours.  In-Fa 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 over the Western North Pacific Ocean.  The upper level trough will produce westerly winds that will blow toward the top of In-Fa’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 In-Fa could intensify during the next 24 hours.  In-Fa could strengthen to the equivalent of a major hurricane during the next several days.

Typhoon In-Fa will move around the southern part of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer In-Fa toward the northwest during the next 24 hours.  On its anticipated track, Typhoon In-Fa will move farther away from Kwajalein.

Typhoon In-Fa Brings Wind and Rain to Ryukyu Islands

Typhoon In-Fa brought gusty winds and locally heavy rain to the Ryukyu Islands on Friday. At 11:00 a.m. EDT on Friday the center of Typhoon In-Fa was located at latitude 25.1°N and longitude 124.9°E which put it about 30 miles (50 km) northwest of Hirara, Japan. In-Fa was moving toward the northwest at 5 m.p.h. (8 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 969 mb.

The slow movement of Typhoon In-Fa during the past several days and its large size caused In-Fa to mix cooler water to the surface in a large area. The cooler water meant that In-Fa extracted less energy from the ocean and thunderstorms weakened in parts of the circulation around the typhoon. There was still a large circular eye with a diameter of of 65 miles (105 km) at the center of Typhoon In-Fa. The eye was surrounded by a broken ring of thunderstorms and the strongest winds were occurring in the broken ring of storms. Bands of showers and thunderstorms continued to revolve around the center of In-Fa. Storms near the center of circulation generated upper level divergence that pumped mass away from the typhoon.

The circulation around Typhoon In-Fa was large. Winds to typhoon force extended out 80 miles (130 km) from the center of In-Fa. Winds to tropical storm force extended out 270 miles (435 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon In-Fa was 11.5. The Hurricane Size Index (HSI) was 31.7 and the Hurricane Wind Intensity Size Index (HWISI) was 43.2.

Typhoon In-Fa will move through an environment somewhat favorable for intensification during the next 24 hours. Once the center of In-Fa moves away from the cooler water mixed to the surface, the typhoon 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. The large size of Typhoon In-Fa will mean that intensification could be slow to occur. Typhoon In-Fa could strengthen during the next 24 hours.

Typhoon In-Fa will move around the southwestern part of a high pressure system over the Western North Pacific Ocean during the next 36 hours. The high will steer In-Fa toward the northwest. On its anticipated track Typhoon In-Fa will move slowly away from the Ryukyu Islands. Since the circulation around In-Fa is so large, the typhoon will continue to produce gusty winds and locally heavy rain for another 24 hours. The center of Typhoon In-Fa could approach the east coast of China south of Ningbo in 48 hours.

Typhoon In-Fa Churns Southeast of Ishigaki

Typhoon In-Fa churned southeast of Ishigaki, Japan on Thursday. At 11:00 a.m. EDT on Thursday the center of Typhoon In-Fa was located at latitude 23.7°N and longitude 125.8°E which put it about 120 miles (195 km) southeast of Ishigaki, Japan. In-Fa was moving toward the northwest at 2 m.p.h. (3 km/h). The maximum sustained wind speed was 100 m.p.h. (160 km/h) and there were wind gusts to 120 m.p.h. (195 km/h). The minimum surface pressure was 957 mb.

Typhoon In-Fa went through an eyewall replacement cycle as it moved slowly toward the southwestern Ryukyu Islands on Thursday. The inner end of an rainband wrapped completely around the original eye and eyewall. Two concentric eyewalls existed simultaneously for a time on Wednesday. Low level convergence became concentrated in the newer, outer eyewall and the inner eyewall dissipated. The eyewall replacement cycle left a much larger eye with a diameter of 65 miles (105 km) at the center of Typhoon In-Fa. Bands of showers and thunderstorms were revolving around the new, larger eye. Storms near the eye generated upper level divergence that pumped mass away from the typhoon.

The circulation around Typhoon In-Fa was large. Winds to typhoon force extended out 70 miles (110 km) from the center of In-Fa. Winds to tropical storm force extended out 230 miles (370 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon In-Fa was 16.5. The Hurricane Size Index (HSI) was 27.4 and the Hurricane Wind Intensity Size Index (HWISI) was 43.9 .

Typhoon In-Fa will move through an environment favorable for intensification during the next 24 hours. In-Fa 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 In-Fa has moved little during the past 12 hours and it has mixed cooler water to the surface. Once In-Fa starts to move a little faster, the core of the typhoon will move back over warmer water. Typhoon In-Fa is likely to strengthen during the next 24 hours and it could intensify to the equivalent of a major hurricane.

Typhoon In-Fa will move around the southwestern part of a high pressure system over the Western North Pacific Ocean during the next 36 hours. The high will steer In-Fa toward the northwest. On its anticipated track the center of Typhoon In-Fa will be near the southwestern Ryukyu Islands in 18 hours. In-Fa will be capable of causing widespread serious damage. It will also cause a significant storm surge. Typhoon In-Fa will drop heavy rain and flash floods are likely. The core of In-Fa could be northeast of Taiwan in 36 hours. In-Fa will also drop heavy rain on parts of northern Taiwan and flash floods are likely there as well.

Elsewhere, Tropical Depression Cempaka continued to meander over southern China. At 11:00 a.m. EDT on Thursday the center of Tropical Depression Cempaka was located at latitude 21.9°N and longitude 107.8°E which put it about 25 miles (40 km) north of Mong Cai, Vietnam. Cempaka was moving toward the northwest at 7 m.p.h. (11 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 In-Fa Moves Toward Southwestern Ryukyu Islands

Typhoon In-Fa moved toward the southwestern Ryukyu Islands on Wednesday. At 11:00 a.m. EDT on Wednesday the center of Typhoon In-Fa was located at latitude 23.9°N and longitude 126.5°E which put it about 155 miles (250 km) east-southeast of Ishigaki, Japan. In-Fa was moving toward the west-southwest at 7 m.p.h. (11 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 951 mb.

Typhoon In-Fa moved closer to the southwestern Ryukyu Islands on Wednesday. In-Fa was a large, powerful typhoon. A circular eye with a diameter of 30 miles (50 km) was at the center of Typhoon In-Fa. The eye was nearly surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms. There was a break in the eastern side of the ring around the eye. Bands of showers and thunderstorms were revolving around the core of Typhoon In-Fa. Storms near the core generated upper level divergence that pumped mass away from the typhoon.

The circulation around Typhoon In-Fa was large. Winds to typhoon force extended out 80 miles (130 km) from the center of In-Fa. Winds to tropical storm force extended out 250 miles (400 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon In-Fa was 19.2. The Hurricane Size Index (HSI) was 25.1 and the Hurricane Wind Intensity Size Index (HWISI) was 44.3.

Typhoon In-Fa will move through an environment favorable for intensification during the next 24 hours. In-Fa will move over water where the Sea Surface Temperatures are near 30°C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Typhoon In-Fa is likely to strengthen to the equivalent of a major hurricane during the next 24 hours.

Typhoon In-Fa will move around the southwestern part of a high pressure system over the Western North Pacific Ocean during the next 36 hours. The high will steer In-Fa toward the west. On its anticipated track the center of Typhoon In-Fa will be near the southwestern Ryukyu Islands in 36 hours. In-Fa will be capable of causing widespread major damage. It will also cause a significant storm surge. Typhoon In-Fa will drop heavy rain and flash floods are likely. The core of In-Fa could be northeast of Taiwan in 60 hours. In-Fa will also drop heavy rain on parts of Taiwan and flash floods are likely there as well.

Elsewhere, Tropical Depression Cempaka was moving over southern China. At 11:00 a.m. EDT on Wednesday the center of Tropical Depression Cempaka was located at latitude 22.5°N and longitude 110.3°E which put it about 5 miles (10 km) east of Yulin, China. Cempaka was moving toward the northwest at 6 m.p.h. (10 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 Cempaka Makes Landfall in Southern China

Typhoon Cempaka made landfall in southern China on Tuesday. At 11:00 p.m. EDT on Tuesday the center of Typhoon Cempaka was located at latitude 21.8°N and longitude 111.9°E which put it about 10 miles (15 km) south of Yangjiang, China. Cempaka was moving toward the northwest at 5 m.p.h. (8 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 972 mb.

Typhoon Cempaka made landfall on the coast of southern China just to the south of Yangjiang in the province of Guangdong on Tuesday. Cempaka brought strong winds and locally heavy rain to the southwestern part of Guangdong. Winds to typhoon force extended out 25 miles (40 km) from the center of Cempaka at the time of landfall. Winds to tropical storm force extended out 100 miles (160 km) from the center of circulation.

Typhoon Cempaka will weaken rapidly as the center moves inland. However, since Cempaka will move slowly, it could drop heavy rain over the southwestern part of Guangdong province. Heavy rain could cause flash floods in some locations.

Elsewhere over the Western North Pacific Ocean, former Tropical Storm In-Fa intensified to a typhoon south-southeast of Okinawa. At 11:00 a.m. EDT on Tuesday the center of Typhoon In-Fa was located at latitude 24.5°N and longitude 128.7°E which put it about 150 miles (245 km) south-southeast of Okinawa. In-Fa was moving toward the west at 7 m.p.h. (11 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 968 mb. Typhoon In-Fa is forecast to move toward the west during the next several days and to intensify to the equivalent of a major hurricane. The center of In-Fa will pass south of Okinawa during the next 24 hours. It could be over the southwestern Ryukyu Islands in 48 hours and near northern Taiwan in three days.

Typhoon In-Fa Turns Toward Iwo To

Typhoon In-fa turned northeast and started to move toward Iwo To late on Monday.  At 10:00 p.m. EST on Monday the center of Typhoon In-Fa was located at latitude 19.0°N and longitude 132.6°E which put it about 695 miles (1120 km) southwest of Iwo To.  In-Fa was moving toward the northeast at 13 m.p.h. (21 km/h).  The maximum sustained wind speed was 100 m.p.h. (160 km/h) and there were wind gusts to 120 m.p.h. (195 km/h).  The minimum surface pressure was 956 mb.

Although In-Fa may be beginning to respond to increased vertical wind shear, it remains a well organized typhoon.  There are signs that a cloud filled eye still exists at the core of In-Fa.  The eye is surround by a ring of strong thunderstorms.  The outer portion of In-Fa’s circulation is becoming more asymmetrical, which is probably the result of increased wind shear.  Most of the thunderstorms outside the core are north and east of the center of circulation.  There are few thunderstorms in the southwestern part of In-Fa.

Typhoon In-Fa is currently over water where the Sea Surface Temperature (SST) is near 28°C.  In-Fa will move over increasingly cooler SSTs as it moves northeast.  The strength of the upper level southwesterly winds will increase as In-Fa moves northeast.  The combination of cooler SSTs and more vertical wind shear will cause Typhoon In-Fa to weaken during the next several days.  It could weaken to a tropical storm by Wednesday.

An upper level trough is steering Typhoon In-Fa toward the northeast and that general motion is expected to continue during the next 48 hours.  In-Fa could start to move faster as the upper level winds increase.  In-Fa could be near Iwo To in about 48 hours.

Typhoon In-Fa Passes North of Yap

The center of Typhoon In-Fa passed north of Yap on Saturday.  At 10:00 p.m. EST on Saturday the center of Typhoon In-Fa was located at latitude 13.7°N and longitude 136.0°E which put it about 285 miles (465 km) north-northwest of Yap.  In-Fa was moving toward the west-northwest at 19 m.p.h. (31 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 944 mb.

The structure of Typhoon In-Fa deteriorated slightly on Saturday, but it remains the equivalent of a major hurricane.  Fewer thunderstorms formed in the northwestern quadrant of the circulation and there are indications that a gap may have opened on the northwestern side of the eyewall.  It is possible that some drier air could have been pulled into that part of the circulation.  However, an eye may still exist at the center of circulation and there are multiple bands around the eastern and southern sides of the typhoon.

Typhoon In-Fa is moving over water where the Sea Surface Temperature is near 29°C.  The upper level winds over the top of the circulation are light and there is not much vertical wind shear over the core of the typhoon.  Typhoon In-Fa could maintain its intensity or weaken slowly on Sunday.  When it moves farther north, it will encounter stronger southwesterly winds which will increase the vertical wind shear.  When the wind shear increases, the rate of weakening will increase.

A subtropical ridge is steering Typhoon In-Fa toward the west-northwest and that general motion is expected to continue for another day or so.  In-Fa could reach the western end of the ridge and turn northward on Monday.  In 36 to 48 hours the southwesterly upper level winds will start to push the typhoon toward the northeast.  On its anticipated track Typhoon In-Fa could be near Iwo To in about four days.

In-Fa Intensifies Back Into a Typhoon and a Tropical Storm Warning Is Issued for Guam

In-Fa intensified rapidly back into a typhoon on Thursday and a Tropical Storm Warning was issued for Guam.  At 10:00 p.m. EDT on Thursday the center of Typhoon In-Fa was located at latitude 10.1°N and longitude 148.1°E which put it about 365 miles (590 km) southeast of Guam.  In-Fa was moving toward the west-northwest at 10 m.p.h. (16 km/h).  The maximum sustained wind speed was 105 m.p.h. (170 km/h) and there were gusts to 125 m.p.h. (200 km/h).  The minimum surface pressure was 954 mb.

After weakening slightly on Wednesday, In-Fa intensified rapidly back into a typhoon on Thursday.  Typhoon In-Fa has a compact tightly wound structure with a small inner core and a tiny pinhole eye.  The strongest winds are contained in the ring of thunderstorms around the pinhole eye.  Many of the strongest thunderstorms outside the eyewall are located southwest of the eye, but there are spiral bands in all quadrants of the storm.  The storms around the core of Typhoon In-Fa are generating upper level divergence in all directions.

Typhoon In-Fa is an environment favorable for intensification.  It is over water where the Sea Surface Temperature is near 29°C.  The upper level winds around In-Fa are light and there is not much vertical wind shear.  In-Fa is likely to intensify more during the next day or two.

A subtropical ridge north of In-Fa is steering the typhoon to the west-northwest and that general motion is expected to continue for another 48 hours.  On its anticipated track the center of In-Fa is likely to pass about 100 miles (160 km) to 150 miles (240 km) south of Guam in about 18 to 24 hours.  The center of Typhoon In-Fa is likely to pass about 200 miles (320 km) northeast of Yap in about 48 hours.