MANILA, May 5 -- Heat index in at least 16 areas may reach "danger level" on Sunday, according to the weather bureau.

The heat index or what the temperature feels like to the human body, could peak at 48C in Aparri, Cagayan; 47C in Dagupan City, Pangasinan; and 45C in Virac, Catanduanes; according to the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA).

Heat indices ranging from 42C to 44C are likely in the following areas:

Laoag City, Ilocos Norte - 44C Dagupan City, Pangasinan - 47C Batac, Ilocos Norte - 42C Bacnotan, La Union - 44C Aparri, Cagayan - 48C Tuguegarao City, Cagayan - 43C Echague, Isabela - 42C Casiguran, Aurora - 42C Puerto Princesa City, Palawan - 42C Cuyo, Palawan - 42C Virac, Cata...