CHABA has turned ENE just off the coast of South Korea, and has weakened into a category 1 typhoon. At 2 pm, CHABA was centred about 200 km (110 NM) ENE of Busan.
CHABA is the 110th name in the tropical cyclone name list. It was contributed by Thailand, meaning shoe flower (Hibiscus). This name was used in 2004 and 2010.
CHABA is situated in the northern periphery of the subtropical ridge that covers a large area of the northwestern Pacific. As it becomes embedded within the westerlies, CHABA will accelerate significantly, crossing the Tohoku region in Honshu overnight.
CHABA has entered a region with very high vertical wind shear and its convections are largely sheared to the northeast. The storm is undergoing extratropical transition, and the process is expected to be complete by t+12.
CHABA has weakened into a category 4 typhoon. At 2 pm, CHABA was centred about 430 km (230 NM) S of Jeju.
暹芭減弱為四級颱風。在下午 2 時，暹芭集結在濟州以南約 430 公里 (230 海里)。
TC
Naming 氣旋命名
CHABA is the 110th name in the tropical cyclone name list. It was contributed by Thailand, meaning shoe flower (Hibiscus). This name was used in 2004 and 2010.
CHABA is still moving north along the western periphery of the subtropical ridge. As the storm moves further north, it is expected to turn sharply to the northeast after t+12 as reaches the northern edge of the ridge. It will accelerate rapidly once it enters the westerlies and will cross Japan near t+36.
CHABA's eye is partially cloud-filled and its eyewall cloud-top temperatures have risen. As sea temperatures drop and vertical wind shear increases, CHABA will weaken quickly in the remainder of the forecast period. The storm is expected to start extratropical transition near t+24 and the process should be complete by t+48.
CHABA is the 110th name in the tropical cyclone name list. It was contributed by Thailand, meaning shoe flower (Hibiscus). This name was used in 2004 and 2010.
CHABA has reached the western periphery of the subtropical ridge, and is expected to move north in the next 24 hours, crossing the ridge axis. CHABA will turn sharply to the east between t+24 and t+48 as it reaches the northern edge of the ridge. It will accelerate rapidly once it enters the westerlies and will cross Japan near t+60.
CHABA's eye has enlarged slightly and its surrounding central dense overcast has developed significantly as a result of improved outflow associated with the mid-latitude trough to its north. The storm is expected to remain as a category 5 super typhoon tonight as it skirts past Okinawa, and should start to weaken after t+12 due to slightly cooler sea temperatures. After t+24, vertical wind shear will also increase, leading to a more rapid decline in its intensity. The storm will start extratropical transition near t+48 and the process should be complete by t+72.
CHABA is the 110th name in the tropical cyclone name list. It was contributed by Thailand, meaning shoe flower (Hibiscus). This name was used in 2004 and 2010.
CHABA is moving northwest along the southwestern periphery of the subtropical ridge. The storm should turn increasingly poleward as it reaches the ridge's western edge and as the ridge starts to retreat slightly ahead of a propagating trough. Forward speed is also expected to decrease as it tracks across the Ryukyu Islands. After t+48, the storm should start to turn northeast; it will be caught by the westerlies near t+72 and start to move east rapidly.
CHABA developed a pinhole eye today within a small but solid central dense overcast, leading to an intensity estimate of a category 4 typhoon. The storm is expected to be at or close to its peak intensity, and little change in its strength should take place in the next 24 hours. The storm will start to weaken after t+24 or t+36 as sea temperatures decrease. More rapid weakening will take place after t+48, and extratropical transition should start around t+72 as the storm races to the east. CHABA is expected to be fully extratropical before t+96.
CHABA is the 110th name in the tropical cyclone name list. It was contributed by Thailand, meaning shoe flower (Hibiscus). This name was used in 2004 and 2010.
CHABA is now situated in the southwestern periphery of the subtropical ridge and is moving northwest steadily. The western edge of the ridge is expected to weaken ahead of a propagating trough, allowing CHABA to turn north around t+48 near Okinawa. The storm will round the ridge and approach Japan next week.
CHABA's convections have tightened further, but its core remains small. Some intensification is expected before t+48 as CHABA moves across warm seas; it will weaken later as it approaches Japan. Extratropical transition is expected to begin near t+96 and be complete near t+120.
CHABA is the 110th name in the tropical cyclone name list. It was contributed by Thailand, meaning shoe flower (Hibiscus). This name was used in 2004 and 2010.
The subtropical ridge is seen protruding south east of CHABA in the past 24 hours. Although CHABA is still in the southern periphery of the subtropical ridge, the protrusion will contribute poleward track component, causing the storm to move northwest in the short run. CHABA will move to the southwestern periphery of the ridge by t+36, and is expected to turn increasingly poleward, moving towards the Ryukyu Islands. The storm is expected to cross the ridge axis near t+72 around Okinawa and then turn northeast, but there is substantial spread on the timing and location of the poleward turn among numerical models.
CHABA's convections are rather sparse but are clearly revolving around the centre. Gradual intensification is expected as CHABA travels across warm seas with low vertical wind shear, with maximum intensity occurring between t+72 and t+96. The storm should weaken as it crosses Japan, and is expected to be undergoing extratropical transition at t+120.
CHABA has intensified into a tropical storm. At 2 pm, CHABA was centred about 310 km (170 NM) WNW of Guam.
暹芭已增強為熱帶風暴。在下午 2 時，暹芭集結在關島西北偏西約 310 公里 (170 海里)。
TC
Naming 氣旋命名
CHABA is the 110th name in the tropical cyclone name list. It was contributed by Thailand, meaning shoe flower (Hibiscus). This name was used in 2004 and 2010.
CHABA is moving west along the southern periphery of a subtropical ridge anchored just southeast of Japan. CHABA will continue to move west in the next 12 hours, after which a reorientation of the ridge will see an extension forming at lower latitudes east of the storm, placing the storm at the ridge's southwestern periphery, and a turn towards the WNW to NW ensues. The storm is expected to cross the ridge axis near t+96 around Okinawa, but there is still some spread on the timing and location of the poleward turn among numerical models.
CHABA has intensified slightly over the past 24 hours; its convections can be seen wrapping around the centre and are more concentrated in the western semicircle. Gradual intensification is expected as CHABA travels across warm seas with low vertical wind shear, with maximum intensity occurring near t+96. Lower sea temperatures will initiate a weakening trend when CHABA reaches higher latitudes.
Tropical disturbance 98W has intensified into tropical depression 21W. The JMA considers it a tropical storm and named it CHABA earlier today. At 2 pm, CHABA was centred about 230 km (130 NM) ENE of Guam.
CHABA is the 110th name in the tropical cyclone name list. It was contributed by Thailand, meaning shoe flower (Hibiscus). This name was used in 2004 and 2010.
CHABA is moving west along the southern periphery of a subtropical ridge anchored just southeast of Japan. CHABA will continue to move west in the next 24 hours, after which a reorientation of the ridge will see an extension forming at lower latitudes east of the storm, placing the storm at the ridge's southwestern periphery, and a turn towards the WNW to NW ensues.
CHABA is currently a small system and the convections are lacking organization. Gradual intensification is expected as CHABA travels across warm seas with low vertical wind shear, but the initial rate may be slower due to restricted outflow channels.
Active Tropical Cyclone(s) 正活躍之熱帶氣旋
