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Sinlaku Weakens to a Tropical Storm

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Former Typhoon Sinlaku weakened to a tropical storm on Saturday.  At 5:00 p.m. EDT on Saturday the center of Tropical Storm Sinlaku was located at latitude 25.8°N and longitude 149.2°E which put the center about 450 miles (730 km) east of Iwo To.  Sinlaku was moving toward the 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 983 mb.

Former Typhoon Sinlaku weakened to a tropical storm as it moved over cooler water on Saturday.  Many of the remaining thunderstorms in Tropical Storm Sinlaku dissipated on Saturday.  There were still some thunderstorms in bands in the eastern side of Sinlaku’s circulation.  The bands in the other parts of Tropical Storm Sinlaku consisted primarily of showers and lower clouds.  There was very little upper level divergence from Tropical Storm Sinlaku.  The convergence of mass in the lower levels of the atmosphere caused the surface pressure to continue to increase.

The circulation around Tropical Storm Sinlaku was still large.  Winds to tropical storm force extended out 250 miles (400 km) from the center of Sinlaku’s circulation.

Tropical Storm Sinlaku will move through an environment that will be unfavorable for intensification during the next 24 hours . Sinlaku will move over water where the Sea Surface Temperatures are near 23°C.  It will move under the southeastern part of an upper level trough that is southeast of Japan.  The upper level trough will produce southwesterly winds that will blow toward the top of Sinlaku’s circulation.  Those winds will cause moderate vertical wind shear.  Sinlaku will also continue to pull drier air into its circulation.  The drier air will continue to to inhibit the development of new thunderstorms in the rainbands revolving around the center of Sinlaku’s circulation.  The cooler Sea Surface Temperatures, moderate vertical wind shear and drier air will cause Tropical Storm Sinlaku to continue to weaken during the next 24 hours.

Tropical Storm Sinlaku will move around the northwestern part of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer Sinlaku toward the northeast during the next 24 hours.  On its anticipated track, Tropical Storm Sinlaku will continue to move away from Iwo To.

Tropical Storm Sinlaku Forms Southeast of the Marianas

Tropical Storm Sinlaku formed southeast of the Marianas on Thursday.  At 5:00 p.m. EDT on Thursday the center of Tropical Storm Sinlaku was located at latitude 8.4°N and longitude 151.5°E which put the center about 65 miles (105 km) north-northwest of Chuuk.  Sinlaku was moving toward the northwest at 4 m.p.h. (6 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 southeast of the Marianas strengthened on Thursday and the Japan Meteorological Agency designated the system as Tropical Storm Sinlaku.

The circulation around Tropical Storm Sinlaku exhibited more organization on Thursday afternoon.  More thunderstorms formed near the center of Sinlaku’s circulation.  More thunderstorms also developed in bands revolving around the center of Tropical Storm Sinlaku.  Storms near the center of Sinlaku began to generate 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 around Tropical Storm Sinlaku was fairly symmetrical.  Winds to tropical storm force extended out 105 miles (165 km) from the center of Sinlaku’s circulation.

Tropical Storm Sinlaku will move through an environment favorable for intensification during the next 24 hours.  Sinlaku will move over water where the Sea Surface Temperatures are near 30°C.  It will move under the southern part of an upper level ridge that is over the Western North Pacific Ocean.  The ridge will produce easterly winds that will blow toward the top of Sinlaku’s circulation.  Those winds will cause some vertical wind shear, but the wind shear will not be enough to prevent intensification.  Tropical Storm Sinlaku will intensify during the next 24 hours.  Sinlaku is likely to strengthen to a typhoon within 36 hours.

Tropical Storm Sinlaku 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 Sinlaku toward the northwest during the next 24 hours.  On its anticipated track, Tropical Storm Sinlaku will move away from Chuuk,  Sinlaku could approach Guam in three or four days.

Tropical Storm Sinlaku will produce gusty winds and locally heavy rain over Chuuk before it moves farther away on Friday.  Heavy rain could cause flash floods in some locations.

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.