High Quality Content by WIKIPEDIA articles! Typhoon Chanchu (international designation: 0601, JTWC designation: 02W, also designated Typhoon Caloy by PAGASA) was the second tropical storm and first typhoon of the 2006 Pacific typhoon season recognized by the Joint Typhoon Warning Center. According to the Japan Meteorological Agency, Chanchu was the first tropical storm of the season. Hong Kong Observatory (HKO) estimated that the maximum sustained wind speed near its centre reached 185 km/h, making it the most intense typhoon on HKO`s record to enter the South China Sea in May. The name submitted by Macau means "pearl".