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According to the National Center for Hydro-Meteorological Forecasting, at 4 am on August 24, the storm eye was at around 19.1 degrees north and 118.5 degrees east, with the strongest velocity of 89-102km per hour.
In the next 24 hours, it is forecast to move west-northwest at about 20-25km per hour.
At 4am on August 25, its center will be at about 190km to the south-southwest of Hong Kong (China) while the strongest winds will be 103-117km per hour.
At 4am on August 26, Maon will go northwest at a speed of 25km per hour and weaken into a tropical depression.
Under the storm's impacts, Viet Nam's northern localities should expect heavy rains from Thursday afternoon to late Friday night, with rainfall at 100-200 mm in most areas and more than 300 mm in some places.
The north central province of Thanh Hoa will also receive rainfall between 50-150 mm, the center said./.