NEW : Chanthu has slowed but is moving steadily closer to southern Vietnam . Harrison said Chanthu has slowed over the last 24 hours and now is expected to make landfall Thursday evening , local time . NEW : Tropical storm could deluge already soaked areas with 20 inches of rain . NEW : Tropical Storm Chanthu calls situation `` grave '' NEW : Chinese news agency says About 287,000 killed by floods Thursday .
NEW : Chanthu has slowed but is moving steadily closer to southern Vietnam . NEW : Tropical storm could deluge already soaked areas with 20 inches of rain . NEW : Tropical Storm Chanthu calls situation `` grave '' NEW : Chinese news agency says About 287,000 killed by floods Thursday .