A tropical storm was blowing across the Philippines' mountainous north Friday, worsening more than a week of bad weather that has caused at least 25 deaths and prompted evacuations in villages affected by flooding and landslides.

The storm was Typhoon Co-may when it made landfall Thursday night in the town of Agno in Pangasinan province with maximum sustained winds of 120 kilometres per hour and gusts of up to 165 kph. It was weakening as it advanced northeastward and had sustained winds of 100 kph on Friday morning.

Co-may was intensifying seasonal monsoon rains that had swamped a large swath of the country for more than a week.