Storm Son-Tinh weakens, downpours expected to continue in northern, northern-central Vietnam
Torrential rain is forecast to pound northern and north-central provinces until Saturday
Typhoon Son-Tinh to make landfall in north-central Vietnam
Average rainfall of 100 to 300 millimeters is forecast to hit northern and north-central provinces
Tropical storm enters East Vietnam Sea, bringing heavy downpours
The typhoon, the third to hit Vietnam this year, will have direct impact on northern and north-central provinces