The Shear Line is forecast to bring heavy rainfall over Northern Luzon from Friday morning until Saturday afternoon, according to PAGASA.
Cagayan, Apayao, and Isabela are under a heavy rainfall warning on Friday.
The amount of rainfall forecast is from 50 to 100 millimeters, potentially higher in mountainous areas.
PAGASA warned that impacts could be worsened by significant antecedent rainfall.
The weather bureau also warned of possible flooding, especially in low-lying or coastal areas.
Cagayan and Apayao are expected to receive 50 to 100 millimeters of rainfall on Saturday.
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