Tropical Cyclone Herman Weakens Southeast of Cocos Islands

Tropical Cyclone Herman weakened over the South Indian Ocean southeast of the Cocos Islands on Saturday. At 5:00 p.m. EDT on Saturday the center of Tropical Cyclone Herman was located at latitude 19.9°S and longitude 106.7°E which put it about 865 miles (1395 km) southeast of the Cocos Islands. Herman was moving toward the south-southwest at 5 m.p.h. (8 km/h). The maximum sustained wind speed was 80 m.p.h. (130 km/h) and there were wind gusts to 100 m.p.h. (160 km/h). The minimum surface pressure was 978 mb.

Tropical Cyclone Herman weakened on Saturday. An upper level trough over the South Indian Ocean produced northwesterly winds that blew toward the top of Herman’s circulation. Those winds caused moderate vertical wind shear and the wind shear caused Tropical Cyclone Herman to weaken. An eye was no longer evident on satellite images of Herman. The inner end of a rainband still wrapped around the southern and western sides of the center of Herman’s circulation. The circulation around Tropical Cyclone Herman was small. Winds to hurricane/typhoon force extended out 20 miles (30 km) from the center of Herman. Winds to tropical storm force extended out 60 miles (95 km) from the center of circulation.

Tropical Cyclone Herman will move through an environment that will be unfavorable for intensification during the next 36 hours. Herman will move over water where the Sea Surface Temperatures are near 26˚C. However, the upper level trough over the South Indian Ocean will continue to produce northwesterly winds that will blow toward the top of Herman’s circulation. Those winds will continue to cause moderate vertical wind shear and the wind shear will cause Tropical Cyclone Herman to weaken. Since Herman’s circulation is small, the tropical cyclone could weaken rapidly at times.

Tropical Cyclone Herman will move north of high pressure system over the South Indian Ocean. The high pressure system will steer Herman toward the west during the next 36 hours. On its anticipated track, Tropical Cyclone Herman will remain far to the south of the Cocos Islands.