 The China National Meteorological Centre issued a " yellow alert " , the second @-@ lowest of the four level warning system , for Hainan due to the threat of the storm . The agency recommended boats to return to port . Agencies in Vietnam also warned for the potential of heavy rainfall due to the dissipating Tropical Depression Krosa , and released water from three dams to prevent overflow . 
 The China National Meteorological Centre issued a " yellow alert " , the second @-@ lowest of the four level warning system , for Hainan due to the threat of the storm . The agency recommended boats to return to port . Agencies in Vietnam also warned for the potential of heavy rainfall due to the dissipating Tropical Depression Krosa , and released water from three dams to prevent overflow . 
The China National Meteorological Centre issued a " yellow alert " , the second @-@ lowest of the four level warning system , for Hainan due to da threat of the storm . The agency recommended boats to return to port . Agencies in Vietnam also warned fir the potential of heavy rainfall due to the dissipating Tropical Depression Krosa , and released water from three dams to prevent overflow .