“Flooding is threatening low-lying areas and possible landslides in mountainous areas,” the Philippine Atmospheric Geophysical and Astronomical Services Administration’s (Pagasa) said in a rainfall advisory it issued at 12 noon.
Orange rainfall means intense rains or 15-30 mm rain observed in an hour and expected to continue in the next two hours.
Residents must be alerted for possible evacuation.
Metro Manila is expected to feel the effects of Ruby by Monday night, between 8 and 10 p.m.
Yellow rainfall warning, which means heavy rains, is issued in Bataan, Pampanga and Bulacan.