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Tropical Cyclone Teratai Redevelops South of Indonesia

Tropical Cyclone Teratai redeveloped south of Indonesia on Tuesday afternoon. At 4:00 p.m. EST on Tuesday the center of Tropical Cyclone Teratai was located at latitude 12.0°S and longitude 106.4°E which put it about 380 miles (615 km) south of Jakarta, Indonesia and about 115 miles (185 km) south-southeast of Christmas Island. Teratai was moving toward the south at 5 m.p.h. (8 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 1000 mb.

After strong upper level winds blew the top off of former Tropical Cyclone Teratai late last week, the circulation in the lower levels made an extended clockwise loop southwest of Indonesia. More thunderstorms formed west of the low level center of circulation on Monday and the circulation around Tropical Cyclone Teratai strengthened during the past 24 hours. Data from scatterometers on satellites indicated that the wind speeds increased back to tropical storm force on Tuesday. The distribution of thunderstorms was still asymmetrical. Thunderstorms were occurring in bands in the western half of Teratai’s circulation. Bands in the eastern side of Tropical Cyclone Teratai consisted primarily of showers and lower clouds. Storms near the center generated upper level divergence that pumped mass away to the west of the tropical cyclone. Teratai was a small tropical cyclone. Winds to tropical storm force extended out 50 miles (80 km) from the center of circulation.

Tropical Cyclone Teratai will move through an environment that will be mostly unfavorable for intensification during the next several days. Teratai will move over water where the Sea Surface Temperatures are near 26.5˚C. It will move under the northern part of an upper level ridge centered northwest of Australia. The upper level ridge will produce easterly winds that will blow toward the top of Teratai’s circulation. Those winds will cause moderate vertical wind shear. The wind shear is already causing an asymmetrical distribution of thunderstorms and the shear will continue to inhibit intensification. Tropical Cyclone Teratai could maintain its intensity during the next 24 hours, but if the wind shear increases Teratai is likely to weaken again.

Tropical Cyclone Teratai will move around the northern part of a high pressure system over the South Indian Ocean. The high pressure system will steer Teratai toward the west-southwest during the next several days. On its anticipated track Tropical Cyclone Teratai will move south of Christmas Island during the next several days.