Doksuri formed as a tropical depression over the western Pacific Ocean on June 26, 2012, and strengthened to a tropical storm the same day, Unisys Weather reported. On June 29, 2012, the U.S. Navy’s Joint Typhoon Warning Center (JTWC) reported that Doksuri was located roughly 100 nautical miles (185 kilometers) south-southeast of Hong Kong. The storm had maximum sustained winds of 40 knots (75 kilometers per hour) with gusts up to 50 knots (95 kilometers per hour). The JTWC storm track projected Doksuri continuing its westward movement in the direction of southern China.
On June 29, Focus Taiwan reported that Taiwan’s weather bureau had canceled a high-sea warning, but nevertheless cautioned residents about potentially heavy rainfall in eastern and southern Taiwan. Meanwhile, Chinese authorities urged preparation for the storm, also warning of rainfall.