Harsh winter weather and torrential rains in Syria's north-western province of Idlib have left some 11,000 displaced Syrian children in difficulties, a charity group warned on Thursday.
Saturday's storm caused water levels in some areas to rise as much as 1.7 metres, as bridges and roads were damaged in record rains.
Mangkhut swamped farm fields in the nation's agricultural north and smashed houses when it tore through at the weekend with violent winds and heavy rains.
Authorities have opened the gates of 34 reservoirs as water reached dangerous levels.
The death toll had climbed to 39 since the heavy rains hit the state on August 8, with the fatalities reported in accidents like drowning and landslides.
More than 12,000 people were also forced to flee their homes due to floods, according to the national disaster risk management council.
The train, with over 360 people on board, was travelling from the Edirne region on the Greek and Bulgarian borders to Istanbul's Halkali station.
Weather officials warned that heavy rainfall was expected for the next four days.
At least 19 people are dead and scores more injured in the wake of heavy monsoon rains in the central Pakistani province of Punjab.
Flood waters seeped into a second chamber of the Tham Luang cave and forced some of the rescue divers to turn back, according to officials.