MANILA, Dec. 21 -- The northeast monsoon or "amihan" continues to affect extreme northern Luzon, while the easterlies will be over the rest of the country on Sunday, according to the latest forecast from the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA).

In Cagayan and Isabela, cloudy skies with scattered rains and isolated thunderstorms are expected due to the shear Line, which could lead to moderate to occasionally heavy rains and raise the risk of flash floods or landslides, according to the weather bureau's 4 a.m. advisory.

Batanes faces similar threats from the northeast monsoon, characterized by cloudy skies and rains that may intensify, also posing dangers of flash flooding and landslides....