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Typhoon Rai Hits the Southern Philippines

Powerful Typhoon Rai hit the southern Philippines on Thursday morning. At 4:00 a.m. EST on Thursday the center of Typhoon Rai was located at latitude 10.0°N and longitude 125.3°E which put it about 25 miles (40 km) southeast of Maasin, Philippines. Rai was moving toward the west at 17 m.p.h. (28 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 927 mb.

The center of powerful Typhoon Rai made landfall on Siargao Island on Thursday morning. The core of Rai’s circulation moved over Dinagat Island and northern Mindanao. The center of Typhoon Rai was over the Bohol Sea just to the south of Leyte. The inner end of a rainband wrapped around the original eye and eyewall of Typhoon Rai as it hit the southern Philippines. Microwave satellite images indicated that concentric eyewalls formed, which increased the size of the core of Rai. Winds to typhoon force extended out 60 miles (95 km) from the center of Typhoon Rai. Winds to tropical storm force extended out 185 miles (295 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon Rai was 31.6. The Hurricane Size Index (HSI) was 18.9 and the Hurricane Wind intensity Size Index (HWISI) was 50.5. Rai was capable of causing regional severe damage.

Typhoon Rai will weaken when the center is over land, but it will move through an environment capable of supporting a strong typhoon as it moves over the southern Philippines. Rai will move over water where the Sea Surface Temperatures are near 30˚C. It will move under the southern side of an upper level ridge over the Western North Pacific Ocean. The ridge will produce easterly winds that will blow toward the top of Typhoon Rai’s circulation. Those winds will cause some vertical wind shear but the wind shear will be too small to cause much weakening. Typhoon Rai weaken gradually when the center passes over land.

Typhoon Rai will move south of a surface high pressure system over the Western North Pacific Ocean. The high pressure system will steer Rai toward the west-northwest during the next 36 hours. On its anticipated track the core of Typhoon Rai will pass over southern Leyte, northern Bohol, Cebu, northern Negros, southern Panay Island, northern Palawan, Linapacan Island, Culion Island and Busuanga Island. Typhoon Rai will weaken when the center passes over land, but it will be the equivalent of a major hurricane as it moves across the southern Philippines. Typhoon Rai will bring very strong winds and locally heavy rain to northern Mindanao, Leyte, Samar, Cebu, Negros, Bohol, Panay Island, Palawan, Linacapan Island, Culion Island and Busuanga Island. Heavy rain could cause flash floods in some locations. Rai will cause a significant storm surge along coasts where the wind blows the water toward the shore. Typhoon Rai could cause severe damage in locations that experience the inner core of the circulation.

Typhoon Rai Rapidly Intensifies to Equivalent of Cat. 5 Hurricane

Typhoon Rai rapidly intensified to the equivalent of a Category 5 hurricane on the Saffir-Simpson Scale on Wednesday night. At 10:00 p.m. EST on Wednesday the center of Typhoon Rai was located at latitude 9.8°N and longitude 126.3°E which put it about 90 miles (145 km) east of Dinagat, Philippines. Rai was moving toward the west at 16 m.p.h. (26 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 Rai continued to intensify very rapidly during Wednesday evening and it strengthened to the equivalent of a Category 5 hurricane on the Saffir-Simpson Scale. A small circular eye with a diameter of 8 miles (13 km) was at the center of Rai’s circulation. 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 Rai. Storms near the core of Rai generated strong upper level divergence that pumped large quantities of mass away to the west and north of the typhoon. The continued rapid removal of mass allowed the surface pressure to decrease very rapidly.

The circulation around Typhoon Rai exhibited more symmetry as it rapidly intensified. Winds to typhoon force extended out 50 miles (80 km) from the center of Rai. Winds to tropical storm force extended out 185 miles (295 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon Rai was 35.0. The Hurricane Size Index (HSI) was 17.5 and the Hurricane Wind Intensity Size Index (HWISI) was 52.5. Typhoon Rai was capable of doing regional catastrophic damage.

Typhoon Rai will move through an environment favorable for intensification during the next few hours. Rai will move over water where the Sea Surface Temperatures are near 30˚C. It will move under the southern side of an upper level ridge over the Western North Pacific Ocean. The ridge will produce easterly winds that will blow toward the top of Typhoon Rai’s circulation. Those winds will cause some vertical wind shear but the wind shear will be too small to prevent intensification. Typhoon Rai could continue to strengthen until the center makes landfall in southern Philippines in a few hours. Rai will weaken when the center passes over land.

Typhoon Rai will move south of a surface high pressure system over the Western North Pacific Ocean. The high pressure system will steer Rai toward the west-northwest during the next 36 hours. On its anticipated track the center of Typhoon Rai will pass over Siargao Island in a few hours. The core of Rai will pass over Dinagat Island, southern Leyte, northern Bohol, Cebu, northern Negros and southern Panay Island. Typhoon Rai will weaken when the center passes over land, but it will be the equivalent of a major hurricane when it moves across the southern Philippines. Typhoon Rai will bring very strong winds and locally heavy rain to northern Mindanao, Siargao Island, Dinagat Island, Samar, Leyte, Cebu, Negros, Bohol and Panay Island. Heavy rain could cause flash floods in some locations. Rai will cause a significant storm surge along coasts where the wind blows the water toward the shore. Typhoon Rai could cause catastrophic damage in locations that experience the inner core of the circulation.

Typhoon Rai Rapidly Intensifies to Equivalent of a Major Hurricane

Typhoon Rai rapidly intensified to the equivalent of a major hurricane on Wednesday. At 4:00 p.m. EST on Wednesday the center of Typhoon Rai was located at latitude 9.5°N and longitude 128.3°E which put it about 190 miles (305 km) east of Dinagat, Philippines. Rai was moving toward the west at 13 m.p.h. (20 km/h). The maximum sustained wind speed was 130 m.p.h. (210 km/h) and there were wind gusts to 160 m.p.h. (260 km/h). The minimum surface pressure was 942 mb.

Typhoon Rai intensified very rapidly during Wednesday afternoon and it reached the equivalent of a major hurricane. . A small circular eye with a diameter of 8 miles (13 km) was at the center of Rai’s circulation. 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 Rai. Storms near the core of Rai generated strong upper level divergence that pumped large quantities of mass away to the west and north of the typhoon. The removal of mass allowed the surface pressure to decrease rapidly.

The circulation around Typhoon Rai increased in size as it rapidly intensified. Winds to typhoon force extended out 45 miles (75 km) from the center of Rai. Winds to tropical storm force extended out 185 miles (295 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon Rai was 25.1. The Hurricane Size Index (HSI) was 17.1 and the Hurricane Wind Intensity Size Index (HWISI) was 42.2. Typhoon Rai was capable of doing regional severe damage.

Typhoon Rai will move through an environment favorable for intensification during the next 12 hours. Rai will move over water where the Sea Surface Temperatures are near 30˚C. It will move under the southern side of an upper level ridge over the Western North Pacific Ocean. The ridge will produce easterly winds that will blow toward the top of Typhoon Rai’s circulation. Those winds will cause some vertical wind shear but the wind shear will be too small to prevent intensification. Typhoon Rai will continue to strengthen during the next 12 hours. Rai could continue to rapidly intensify during the next few hours.

Typhoon Rai will move south of a surface high pressure system over the Western North Pacific Ocean. The high pressure system will steer Rai toward the west-northwest during the next 48 hours. On its anticipated track the center of Typhoon Rai could approach northern Mindanao in 12 hours. Rai will be the equivalent of a major hurricane when it reaches the Philippines. Typhoon Rai will bring very strong winds and locally heavy rain to northern Mindanao, Siargao Island, Dinagat Island, Samar, Leyte, Cebu, Negros, Bohol and Panay Island. Heavy rain could cause flash floods in some locations. Rai will cause a significant storm surge along coasts where the wind blows the water toward the shore.

Typhoon Rai Strengthens East of Mindanao

Typhoon Rai strengthened east of Mindanao on Wednesday morning. At 10:00 a.m. EST on Wednesday the center of Typhoon Rai was located at latitude 9.5°N and longitude 129.3°E which put it about 260 miles (415 km) east of Dinagat, Philippines. Rai was moving toward the west at 12 m.p.h. (19 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 969 mb.

Typhoon Rai continued to intensify during Tuesday night and Wednesday morning. A small circular eye was at the center of Rai’s circulation. 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 Rai. The strongest rainbands were in the western and southern parts of the typhoon. Storms near the core of Rai generated upper level divergence that pumped mass away to the west and north of the typhoon.

The circulation around Typhoon Rai tightened as it intensified. Winds to typhoon force extended out 40 miles (65 km) from the center of Rai. Winds to tropical storm force extended out 125 miles (200 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon Rai was 13.9. The Hurricane Size Index (HSI) was 10.0 and the Hurricane Wind Intensity Size Index (HWISI) was 23.9. Typhoon Rai was capable of doing regional serious damage.

Typhoon Rai will move through an environment favorable for intensification during the next 18 hours. Rai will move over water where the Sea Surface Temperatures are near 30˚C. It will move under the southern side of an upper level ridge over the Western North Pacific Ocean. The ridge will produce easterly winds that will blow toward the top of Typhoon Rai’s circulation. Those winds will cause some vertical wind shear but the wind shear will be too small to prevent intensification. Typhoon Rai will continue to strengthen during the next 18 hours. Rai could undergo a period of rapid intensification

Typhoon Rai will move south of a surface high pressure system over the Western North Pacific Ocean. The high pressure system will steer Rai toward the west-northwest during the next 48 hours. On its anticipated track the center of Typhoon Rai could approach northern Mindanao in 18 hours. Rai will be a typhoon when it reaches the Philippines. Typhoon Rai will bring strong winds and locally heavy rain to northern Mindanao, Siargao Island, Dinagat Island, Samar, Leyte, Cebu, Negros, Bohol and Panay Island. Heavy rain could cause flash floods in some locations. Rai will cause a significant storm surge along coasts where the wind blows the water toward the shore.