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Typhoon Hinnamnor Intensifies Back to Equivalent of a Major Hurricane

Typhoon Hinnamnor intensified back to the equivalent of a major hurricane west of Okinawa on Saturday night. At 11:00 p.m. EDT on Saturday the center of Typhoon Hinnamnor was located at latitude 26.6°N and longitude 124.4°E which put it about 205 miles (330 km) west of Okinawa. Hinnamnor was moving toward the north at 12 m.p.h. (19 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 951 mb.

Typhoon Hinnamnor strengthened back to the equivalent of a major hurricane over the East China Sea west of Okinawa on Saturday night. Two concentric eyewalls appeared to have formed in the middle of Typhoon Hinnamnor. A small inner eye with a diameter of 12 miles (19 km) was that the center of Hinnamnor’s circulation. The inner eye was surrounded by a ring of strong thunderstorms and the strongest winds were occurring in that ring of storms. A much larger, outer eyewall with a diameter of 100 miles (160 km) surrounded the inner eye and eyewall.

The formation of concentric eyewalls caused the size of the circulation around Typhoon Hinnamnor to increase. Winds to typhoon force extended out 70 miles (110 km) from the center of Hinnamnor. Winds to tropical storm force extended out 270 miles (435 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon Hinnamnor was 22.1. The Hurricane Size Index (HSI) was 29.3 and the Hurricane Wind Intensity Size Index (HWISI) was 51.4. Typhoon Hinnamnor was capable of causing widespread major damage.

Typhoon Hinnamnor will move through an environment favorable for intensification during the next 24 hours. Hinnamnor will move over water where the Sea Surface Temperatures are 30˚C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Typhoon Hinnamnor could intensify until the inner eyewall starts to weaken and an eyewall replacement cycle begins. Hinnamnor will move closer to the upper level westerly winds in the middle latitudes on Monday. The vertical wind shear will increase when that happens and Hinnamnor will weaken.

Typhoon Hinnamnor will move around the western end of a high pressure system over the Western North Pacific Ocean. The high pressure system will steer Hinnamnor toward the north during the next 24 hours. Hinnamnor will move toward northeast when it reaches the westerly winds in the middle latitudes. On its anticipated track Typhoon Hinnamnor will move east of Shanghai in 24 hours. Hinnamnor could approach South Korea in 36 hours.

Typhoon Hinnamnor Brings Wind and Rain to Southern Ryukyu Islands

Typhoon Hinnamnor brought wind and rain to the southern Ryukyu Islands on Saturday morning. At 5:00 a.m. EDT on Saturday the center of Typhoon Hinnamnor was located at latitude 24.1°N and longitude 124.6°E which put it about 35 miles (55 km) east-southeast of Ishigaki, Japan. Hinnamnor was moving toward the north at 7 m.p.h. (11 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 967 mb.

Typhoon Hinnamnor strengthened as it moved slowly through the southern Ryukyu Islands on Saturday morning. A small circular eye formed at the center of Hinnamnor’s circulation. The eye was east of Ishigakijima and southwest of Miyakojima. The eye was surrounded by a broken 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 Hinnamnor. Storms near the core generated upper level divergence that pumped mass away from the typhoon.

Typhoon Hinnamnor had a large circulation. Winds to typhoon force extended out 70 miles (110 km) from the center of Hinnamnor. Winds to tropical storm force extended out 225 miles (360 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon Hinnamnor was 16.4. The Hurricane Size Index (HSI) was 22.3 and the Hurricane Wind Intensity Size Index (HWISI) was 38.7. Typhoon Hinnamnor was capable of causing widespread serious damage.

Typhoon Hinnamnor will produce strong gusty winds and locally heavy rain over the southern Ryukyu Islands during the next 12 hours. The eastern side of the eyewall could pass over or close to Miyakojima. Strong winds will be capable of causing serious damage. Heavy rain could cause flash floods in some locations. The winds will not be as strong on Ishigakijima because the western side of the eyewall will pass to the east. Weather conditions will improve gradually when Typhoon Hinnamnor moves farther to the north.

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

Typhoon Hinnamnor will move around the western end of a high pressure system over the Western North Pacific Ocean. The high pressure system will steer Hinnamnor toward the north during the next 36 hours. On its anticipated track Typhoon Hinnamnor will move across the southern Ryukyu Islands during the next 12 hours. The center of Hinnamnor will be west of Okinawa in 24 hours. Typhoon Hinnamnor could be southeast of Shanghai in 36 hours.

Chanthu Weakens to a Tropical Storm East of Shanghai

Former Typhoon Chanthu weakened to a tropical storm east of Shanghai on Monday night. At 11:00 p.m. EDT on Monday the center of Tropical Storm Chanthu was located at latitude 31.3°N and longitude 123.9°E which put it about 150 miles (240 km) east of Shanghai, China. Chanthu was moving toward the northeast at 4 m.p.h. (6 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 988 mb.

Former Typhoon Chanthu weakened to a tropical storm east of Shanghai. An upper level trough over eastern China was producing southwesterly winds that were blowing toward the top of Tropical Storm Chanthu. Those winds were causing moderate vertical wind shear. In addition, the circulation around Chanthu was pulling drier air from Asia into the tropical storm. The drier air was mixing with the rainbands. The eye and eyewall at the center of former Typhoon Chanthu weakened. Thunderstorms were occurring in bands in the northeastern periphery of Tropical Storm Chanthu. Bands in other parts of Chanthu consisted primarily of showers and lower clouds. Winds to tropical storm force extended out 200 miles (300 km) from the center of Chanthu.

Tropical Storm Chanthu will be in an area where the steering winds are weak during the next 24 hours. Chanthu will not move very much during that time period. Since Tropical Storm Chanthu will not move very far, its circulation will mix cooler water to the surface. A combination of moderate vertical wind shear, drier air and cooler water will cause Tropical Storm Chanthu to weaken gradually. Southwesterly winds in the middle latitudes will start to steer Chanthu toward the northeast in a day or so.

Typhoon Chanthu Moves Away from Taiwan

Typhoon Chanthu moved away from Taiwan on Sunday. At 11:00 a.m. EDT on Sunday the center of Typhoon Chanthu was located at latitude 26.8°N and longitude 122.7°E which put it about 105 miles (165 km) northeast of Taipei, Taiwan. Chanthu was moving toward the north-northeast at 12 m.p.h. (19 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 965 mb.

Typhoon Chanthu moved away from Taiwan on Sunday and the weather conditions were improving there. The core of Chanthu passed east of Taiwan and so it remained intact. A small circular eye was present at the center of Typhoon Chanthu. The eye was surrounded by a ring of strong thunderstorms and the strongest winds were occurring in that ring of storms. Multiple bands of showers and thunderstorms were revolving around the core of Chanthu. Storms near the core generated upper level divergence that pumped mass away to the north of the typhoon.

The overall circulation of Typhoon Chanthu was larger after it moved past Taiwan. Winds to typhoon force extended out 25 miles (40 km) from the center of Chanthu. Winds to tropical storm force extended out 190 miles (305 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon Chanthu was 19.2. The Hurricane Size Index (HSI) was 10.7 and the Hurricane Wind Intensity Size Index (HWISI) was 29.9. Typhoon Chanthu was capable of causing regional serious damage.

Typhoon Chanthu will move through an environment that will be mostly unfavorable for intensification during the next 36 hours. Chanthu will move over water where the Sea Surface Temperature is near 29˚C. An upper level trough over eastern China will produce southwesterly winds that will blow toward the top of Chanthu’s circulation. Those winds will cause moderate vertical wind shear. The wind shear will likely be strong enough to cause Typhoon Chanthu to weaken gradually.

Typhoon Chanthu will move around the western side of a subtropical high pressure system over the Western North Pacific Ocean. The high will steer Chanthu toward the north during the next 24 hours. On its anticipated track Typhoon Chantu will continue to move away from Taiwan. Chanthu could approach the coast of Chine south of Shanghai in 24 hours. Typhoon Chanthu will bring gusty winds and locally heavy rain to the parts of east coast of China on Monday.

Elsewhere over the Western North Pacific Ocean, Tropical Depression Conson weakened near the coast of Vietnam. At 11:00 a.m. EDT on Sunday the center of Tropical Depression Conson was located at latitude 15.4°N and longitude 109.1°E which put it about 70 miles (110 km) southeast of Da Nang, Vietnam. Conson was stationary. 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 1003 mb.

Tropical Storm Nepartak Strengthens East of Tokyo

Tropical Storm Nepartak strengthened east of Tokyo on Monday night. At 11:00 p.m. EDT on Monday the center of Tropical Storm Nepartak was located at latitude 35.4°N and longitude 142.3°E which put it about 160 miles (260 km) east of Tokyo, Japan. Nepartak was moving toward the north-northwest at 5 m.p.h. (8 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 992 mb.

Tropical Storm Nepartak exhibited a structure a little more like a tropical cyclone on Monday night. Nepartak was embedded in the center of an upper level low. The center of Tropical Storm Nepartak was under the center of the upper level low and the circulation assumed a more circular shape. Bands of showers and thunderstorms were revolving around the center of Nepartak. Winds to tropical storm force extended out 160 miles (260 km) in the eastern side of the circulation. Winds to tropical storm force extended out 100 miles (160 km) in the western side of Nepartak.

Tropical Storm Nepartak will move through an environment capable of supporting a tropical storm during the next 18 hours. Nepartak will move over water where the Sea Surface Temperatures are near 26°C. Since Tropical Storm Nepartak is embedded at the center of an upper level low, the winds are blowing from the same direction at all levels in the troposphere. So, there will be little vertical wind shear. Tropical Storm Nepartak will likely maintain its intensity during the next 18 hours and it could strengthen a little more.

The upper level low and Tropical Storm Nepartak are forecast to drift toward the northwest during the next 24 hours. On its anticipated track the center of Nepartak could make landfall on the northern coast of Honshu near Sendai in about 18 hours. Tropical Storm Nepartak will bring gusty winds and locally heavy rain to parts of northern Honshu. Nepartak already generated waves along the coast of Honshu and some Olympic events at coastal sites were postponed.

Elsewhere, Tropical Storm In-Fa continued to drop heavy rain over parts of eastern China. At 11:00 p.m. EDT on Monday the center of Tropical Storm In-Fa was located at latitude 31.2°N and longitude 119.5°E which put it about 100 miles (160 km) west of Shanghai, China. In-Fa 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 982 mb.

Tropical Storm In-Fa Makes Landfall near Shanghai

Tropical Storm In-Fa made landfall on the east coast of China near Shanghai on Sunday. At 5:00 p.m. EDT on Sunday the center of Tropical Storm In-Fa was located at latitude 30.6°N and longitude 121.4°E which put it about 50 miles (80 km) south of Shanghai, China. In-Fa was moving toward the northwest at 6 m.p.h. (10 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 987 mb.

Tropical Storm In-Fa weakened slowly as it approached the east coast of China. The circulation around In-Fa pulled drier air from Asia into the western side of the former typhoon. The drier air caused thunderstorms in the western half of Tropical Storm In-Fa to weaken. The strongest thunderstorms were occurring in bands on the eastern side of In-Fa. Bands in the western half of the tropical storm consisted primarily of showers and lower clouds. Winds to tropical storm force extended out 165 miles (270 km) on the eastern side of In-Fa. The strongest winds were occurring over the waters of the East China Sea. Winds to tropical storm force extended out 80 miles on the western side of the circulation.

Tropical Storm In-Fa will move slowly toward the northwest, which will take it farther inland over eastern China. The circulation around In-Fa will weaken gradually as the tropical storm moves farther inland. Tropical Storm In-Fa will bring gusty winds and locally heavy rain to the region around Shanghai and Ningbo. Heavy rain could cause flash floods in some locations.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Nepartak swirled southwest of Japan. At 5:00 p.m. EDT on Sunday the center of Tropical Storm Nepartak was located at latitude 33.4°N and longitude 149.7°E which put it about 630 miles (1015 km) east-southeast of Tokyo, Japan. Nepartak was moving toward the north at 13 m.p.h. (20 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 Bavi Passes East of Shanghai

Typhoon Bavi passed east of Shanghai on Tuesday.  At 5:00 p.m. EDT on Tuesday the center of Typhoon Bavi was located at latitude 31.9°N and longitude 124.7°E which put it about 200 miles (320 km) east-northeast of Shanghai, China.  Bavi was moving toward the north-northwest at 9 m.p.h. (15 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 958 mb.

The circulation around Typhoon Bavi was well organized on Tuesday.  A circular eye with a diameter of 18 miles (30 km) was at the center of Bavi.  A ring of strong thunderstorms surrounded the eye and the strongest winds were occurring in that ring of storms.  Bands of showers and thunderstorms were revolving around the core of Typhoon Bavi.  Storm near the core generated upper level divergence which pumped mass away to the north of the typhoon.

The circulation around Typhoon Bavi was moderately large.  Winds to typhoon force extended out 40 miles (65 km) from the center of circulation.  Winds to tropical storm force extended out 150 miles (240 km) from the center.  The Hurricane Intensity Index (HII) for Bavi was 19.2.  The Hurricane Size Index (HSI) was 16.0 and the Hurricane Wind Intensity Size Index (HWISI) was 35.2.  Typhoon Bavi was capable of causing regional serious damage.

Typhoon Bavi will move through an environment favorable for intensification during the next 12 hours.  Bavi will move over water where the Sea Surface Temperature is 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 Bavi could strengthen into the equivalent of a major hurricane during the next 12 hours.  In 12 hours Bavi will start to move over cooler water, which could end the chance for intensification.  In 24 hours Typhoon Bavi will approach the eastern part of an upper level trough over China.  The trough will produce strong southwesterly winds which will cause strong vertical wind shear.  The strong shear will cause Bavi to weaken more quickly.

Typhoon Bavi will move around the western end of a subtropical high pressure system over the Western North Pacific Ocean.  The high will steer Bavi toward the north during the next 36 hours.  On its anticipated track Typhoon Bavi could approach the west coast of North Korea in about 24 hours.  Bavi will bring strong winds and locally heavy rain to North Korea and parts of northeastern China.

Typhoon Hagupit Makes Landfall in China

Typhoon Hagupit made landfall in China on Monday.  At 5:00 p.m. EDT on Monday the center of Typhoon Hagupit was located at latitude 28.3°N and longitude 120.8°E which put it about 50 miles (80 km) south-southwest of Taizhou, China and about 235 miles (375 km) south of Shanghai.  Hagupit was moving toward the north-northwest at 13 m.p.h. (20 km/h).  The maximum sustained wind speed was 80 m.p.h. (130 km/) and there were wind gusts to 100 m.p.h. (160 km/h).  The minimum surface pressure was 978 mb.

Former Tropical Storm Hagupit strengthened quickly to a typhoon before it made landfall on the east coast of China.  A circular eye formed at the center of circulation.  A ring of strong thunderstorms surrounded the eye and the strongest winds were occurring in that ring of storm.  Winds to typhoon force extended out 35 miles (55 km) from the center of circulation.  Winds to tropical storm force extended out 135 miles (220 km) from the center.

The Hurricane Intensity Index (HII) for Typhoon Hagupit was 11.5.  The Hurricane Size Index (HSI) was 12.0 and the Hurricane Wind Intensity Size Index (HWISI) was 23.5.  Typhoon Hagupit was capable of causing regional minor damage.

Typhoon Hagupit will move around the western end of a subtropical high pressure system over the Western North Pacific Ocean.  The high will steer Hagupit toward the north during the next 24 hours.  On its anticipated track the center of Typhoon Hagupit will pass west of Shanghai in 18 to 24 hours.  Hagupit will bring gusty winds and locally heavy rain to Zhejiang and Jiangsu. Heavy rain could cause flash floods in some locations.  Typhoon Hagupit will also cause a storm surge along the coast of Zhejiang, Jiangsu and Shanghai Shi.

Tropical Storm Hagupit Almost a Typhoon

Tropical Storm Hagupit intensified to almost typhoon strength east of Taiwan on Sunday.  At 11:00 p.m. EDT on Sunday the center of Typhoon Hagupit was located at latitude 25.4°N and longitude 123.2°E which put it about 130 miles (215 km) east of Taipei, Taiwan.  Hagupit was moving toward the north-northwest at 10 m.p.h. (16 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 985 mb.

The circulation around Tropical Storm Hagupit exhibited much greater organization on Sunday night.  The inner end of a rainband wrapped around the center of circulation and an eye emerged on visible satellite imagery.  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 Hagupit.  The strongest rainbands were in the eastern half of the circulation.  Bands in the western half of the tropical storm consisted primarily of showers and lower clouds.  Winds to tropical storm force extended out 115 miles (185 km) from the center of circulation.

Tropical Storm Hagupit will move through an environment favorable for intensification during the next 24 hours.  Hagupit will move over water where the Sea Surface Temperature is near 29°C.  It will move through a region where the upper level winds are weak and there will be little vertical wind shear.  Tropical Storm Hagupit will intensify into a typhoon during the next 6 to 12 hours.

Tropical Storm Hagupit will move around the western end of a subtropical high pressure system over the Western North Pacific Ocean.  The high will steer Hagupit toward the north-northwest during the next 24 to 36 hours.  On its anticipated track Hagupit will approach the coast of China south of Shanghai near Wenzhou in about 24 hours.  It will bring gusty winds and locally heavy rain to the east coast of China.  Heavy rain could cause flash floods in some locations.

Elsewhere, former Tropical Storm Sinlaku dropped locally heavy rain on northern Vietnam and Laos.  At 2:00 p.m. EDT on Sunday the center of Tropical Depression Sinlaku was located at latitude 19.7°N and longitude 103.6°E which put it about 150 miles (240 km) north of Vientiane, Laos.  Sinlaku was moving toward the west at 10 m.p.h. (16 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 996 mb.

Tropical Storms Sinlaku & Hagupit Form over West Pacific

Tropical Storms Sinlaku and Hagupit formed over the Western North Pacific Ocean on Saturday.  At 11:00 a.m. EDT on Saturday the center of Tropical Storm Sinlaku was located at latitude 19.4°N and longitude 107.1°E which put it about 90 miles (145 km) southeast of Nam Dinh, Vietnam.  Sinlaku was moving toward the northwest at 12 m.p.h. (19 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 993 mb.

The circulation around a low pressure system near Vietnam exhibited greater organization on Saturday and the Japan Meteorological Agency designated the system as Tropical Storm Sinlaku.  Bands of showers and thunderstorms were revolving around the center of Sinlaku.  There were more thunderstorms in the bands on the western side of the circulation.  Winds to tropical storm force extended out 110 miles (185 km) from the center of circulation.

Tropical Storm Sinlaku has about 12 hours to strengthen before it makes landfall in northern Vietnam.  Sinlaku will move over water where the Sea Surface Temperature is near 30°.  It will move under the southeast part of an upper level ridge over Asia.  The ridge will produce easterly winds which will blow toward the top of Sinlaku.  Those winds will cause moderate vertical wind shear and the shear will limit intensification.  Tropical Storm Sinlaku will bring gusty winds and rain to northern Vietnam on Sunday.

The circulation around a second low pressure system east of Taiwan also exhibited more organization on Saturday and the Japan Meteorological Agency designated that system as Tropical Storm Hagupit.  At 11:00 a.m. EDT on Saturday the center of Tropical Storm Hagupit was located at latitude 21.8°N and longitude 126.5°W which put it about 220 miles (350 km) southeast of Ishigaki, Japan.  Hagupit was moving toward the northwest at 13 m.p.h. (20 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 1003 mb.

The circulation around Tropical Storm Hagupit was still organizing on Saturday.  Thunderstorms were developing in bands in the eastern half of Hagupit.  Bands in the western side of the circulation consisted primarily of showers and lower clouds.  Storms near the center of Hagupit were generating upper level divergence which was pumping mass away to the east of the tropical storm.

Tropical Storm Hagupit will move through an environment favorable for intensification.  Hagupit will move over water where the Sea Surface Temperature is near 30°C.  Hagupit will move into a region where the upper level winds are weaker and there will not be a lot of vertical wind shear.  Tropical Storm Hagupit is likely to intensify during the next 24 to 36 hours.

Tropical Storm Hagupit will move around the western end of a high pressure system over the Western North Pacific Ocean.  The high will steer Hagupit toward the northwest during the next several days.  On its anticipated track the center of Tropical Storm Hagupit will pass near Ishigaki, Japan in about 24 hours.  Hagupit will approach the coast of China south of Shanghai in about 48 hours.