Hanoi, Aug. 30 -- Storm Nongfa weakened into a tropical depression and rolled into the mainland between central Ha Tinh and Quang Tri provinces on August 30 afternoon, said Director of the National Centre for Hydro-Meteorological Forecasting Mai Van Khiem. At 4pm, the depression's centre was located at about 18.1 degrees North and 106.1 degrees East, in the area between Ha Tinh and Quang Tri. The system sustained maximum wind speeds of Levels 6-7 (39-61km per hour), with gusts reaching Level 9. It moved westwards at some 20-25km per hour. As of 4am on August 31, the tropical depression is predicted to be in central Laos, moving west-northwest at 20km per hour and easing further into a low-pressure area. Due to its impact, the waters off t...