Manila, May 3 -- At least 30 areas across the country are forecast to experience heat index within the danger level on Friday, the weather bureau said.

The heat index or what the temperature feels like to the human body when relative humidity is combined with the air, could peak at 47C in Dagupan City, Pangasinan and Aparri, Cagayan, and 45C in Roxas City, Capiz.

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

Laoag City, llocos Norte Iba, Zambales Cuyo, Palawan Virac, Catanduanes CBSUA-Pili, Camarines Sur Dumangas, Iloilo Zamboanga City, Zamboanga del Sur Bacnotan, La Union Tuguegarao City, Cagayan Casiguran, Aurora San Jose, Occidental Mindoro Puerto Princesa City, Palawan Aborlan, Palawan MMSU, Batac, Ilocos ...