MANILA - Alarm level 1 was hoisted Monday night for communities living along the Marikina River as the river's water level reached 15 meters, the city government said.
The Marikina City Public Information Office (PIO) hoisted the alarm at 8:30 p.m.
It said 6 of 8 floodgates on the river have been opened.
Under the Marikina River's alert system, alarm level 1 serves as a warning when the river's water level reaches 15m.
Alarm level 2, which means "prepare," is raised when the water reaches 16 meters.
Evacuation starts when alarm level 3 is raised, or when water reaches is 17 meters.
Forced evacuation is implemented when the alarm reaches critical level, or when when the water rises to 18 or more meters.
Typhoon Jose Heavy has intensified monsoon rains in central and northern Luzon and Metro Manila.