 Due to the favorable environment, Rina continued to strengthen through the early evening, becoming a Category 3 major hurricane at 1800 UTC.Six hours later, Rina achieving its peak intensity with sustained winds of 115 mph (185 km/h) and a pressure of 966 mbar (hPa; 28.53 inHg) when located about east-southeast of Chetumal.However, Rina's peak intensity did not last very long, and it dropped below major hurricane strength twelve hours after peak intensity.