 By early on February 7, the circulation had become better defined as it remained in an area of weak wind shear and strong diffluence.At 0600 UTC, Météo-France (MFR) classified it as Tropical Depression Eleven about 880 km (550 mi) north-northeast of Mauritius.Around the same time, the Joint Typhoon Warning Center (JTWC) began issuing advisories on the system as Tropical Cyclone 18S.