Tropical Cyclone Emnati Moves Toward Madgascar

Tropical Cyclone Emnati moved toward Madagascar on Monday morning. At 4:00 a.m. EST on Monday the center of Tropical Cyclone Emnati was located at latitude 18.1°S and longitude 53.1°E which put it about 255 miles (410 km) east of Toamasina, Madagascar. Emnati was moving toward the west-southwest at 7 m.p.h. (11 km/h). The maximum sustained wind speed was 115 m.p.h. (185 km/h) and there were wind gusts to 145 m.p.h. (235 km/h). The minimum surface pressure was 949 mb.

The center of Tropical Cyclone Emnati was surrounded by concentric eyewalls on Monday morning. The original, inner eyewall surrounded an eye with a diameter of 15 miles (24 km). A larger, outer eyewall with a diameter of 45 miles (75 km) surrounded the inner eye and eyewall. The inner eyewall was slowly weakening and the low level convergence was becoming more concentrated at the outer eyewall. Bands of showers and thunderstorms were revolving around the concentric eyewalls. Storms around the large core of Emnati generated upper level divergence that pumped mass away from the tropical cyclone.

The size of the circulation around Tropical Cyclone Emnati increased after the concentric eyewalls formed. Winds to hurricane/typhoon force extended out 75 miles (120 km) from the center of Emnati. Winds to tropical storm force extended out 215 miles (345 km) from the center of circulation. The Hurricane Intensity Index (HII) for Tropical Cyclone Emnati was 20.6. The Hurricane Size Index (HSI) was 26.3 and the Hurricane Wind Intensity Size Index (HWISI) was 46.9. Emnanti was similar in intensity and size to Hurricane Rita when Rita hit southwest Louisiana in 2005.

Tropical Cyclone Emnati will move through an environment favorable for intensification during the next 24 hours. Emnati will move over water where the Sea Surface Temperatures are near 28˚C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Even though Tropical Cyclone Emnati will be in an environment favorable for intensification, the current eyewall replace cycle could cause Emnati to weaken while the inner eyewall dissipates. Tropical Cyclone Emanti could eventually strengthen again after the eyewall replacement cycle is completed.

Tropical Cyclone Emnati will move north of a high pressure system over the Southwest Indian Ocean. The high pressure system will steer Emnati toward the west-southwest during the next 36 hours. On its anticipated track Tropical Cyclone Emanti could reach the southeast coast of Madagascar in 36 hours. The center of Emnati could make landfall between Mananjary and Vangaindrano. Tropical Cyclone Emnati could be the equivalent of a major hurricane when it reaches Madagascar. Emnati will be capable of causing widespread major damage to southern Madagascar. Tropical Cyclone Emnati will bring strong destructive winds and locally heavy rain to southern Madagascar. Heavy rain is likely to cause flash floods in some locations. Emanti will also cause a significant storm surge along the southeast coast of Madagascar.