Tropical Cyclone Freddy Still Moving West

Tropical Cyclone Freddy was still moving westward over the South Indian Ocean on Thursday morning. At 10:00 a.m. EST on Thursday the center of Tropical Cyclone Freddy was located at latitude 15.1°S and longitude 78.8°E which put it about 720 miles (1165 km) southeast of Diego Garcia. Freddy was moving toward the west at 17 m.p.h. (28 km/h). The maximum sustained wind speed was 145 m.p.h. (230 km/h) and there were wind gusts to 175 m.p.h. (280 km/h). The minimum surface pressure was 929 mb.

Powerful Tropical Cyclone Freddy continued to move toward the west over the South Indian Ocean. A smallcircular eye with a diameter of 8 miles (13 km) was at the center of Tropical Cyclone Freddy. The eye was surrounded by a ring of strong thunderstorms and the strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms were revolving around the core of Freddy’s circulation. Storms near the core generated strong upper level divergence that pumped mass away from the tropical cyclone in all directions.

The circulation around Tropical Cyclone Freddy was small. Winds to hurricane/typhoon force extended out 50 miles (80 km) from the center of Freddy. Winds to tropical storm force extended out 80 miles (130 km) from the center of circulation. The Hurricane Intensity Index (HII) for Freddy was 30.0. The Hurricane Size Index (HSI) was 14.6 and the Hurricane Wind Intensity Size Index (HWISI) was 44.6.

Tropical Cyclone Freddy will move through an environment that will be favorable for a strong tropical cyclone during the next 24 hours. Freddy will move over over water where the Sea Surface Temperatures are near 28˚C. An upper level ridge over the South Indian Ocean will produce easterly winds that will blow toward the top of Freddy’s circulation. The winds in the lower levels of the atmosphere will also blow from the east. So, there will be little vertical wind shear. If the inner end of a rainband wraps around the existing small inner core of Tropical Cyclone Freddy, then concentric eyewalls could form. That would start an eyewall replacement cycle that would cause Freddy to weaken temporarily.

Tropical Cyclone Freddy will move around the northern part of a high pressure system over the South Indian Ocean. The high pressure system will steer Freddy toward the west during the next several days. On its anticipated track, Tropical Cyclone Freddy will move south of Diego Garcia in 36 hours. Freddy could eventually threaten Mauritius, La Reunion and Madagascar in a few days. Tropical Cyclone Freddy could be northeast of Rodrigues in three days. Freddy could approach Mauritius in four days and it could be near the east coast of Madagascar in five days.

Elsewhere over the South Indian Ocean, Tropical Cyclone Dingani completed a transition to an extratropical cyclone. At 4:00 a.m. EST on Thursday the center of former Tropical Cyclone Dingani was located at latitude 31.5°S and longitude 67.7°E which put it about 860 miles (1385 km) south-southeast of Rodrigues. Dingani was moving toward the south at 9 m.p.h. (15 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 999 mb.