A huge part of the county will continue to experience generally fair weather on Friday, with at least 25 areas forecast to experience high or danger-level heat indices.
The frontal system affecting extreme Northern Luzon will also continue to cause scattered rain showers and thunderstorms over Batanes and Cagayan.
Moderate to heavy rains in those areas could result in flash floods or landslides, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) said.
The easterlies affecting the rest of the country will cause generally fair weather, with isolated rain showers due to localized thunderstorms.
PAGASA forecast the heat index or what the temperature feels like to the human body when relative humidity is combined with the air, to peak at 45°C in Virac, Catanduanes.
Heat indices from 42°C to 44°C are forecast in the following areas:
Dagupan City, Pangasinan – 44°C
Puerto Princesa City, Palawan – 44°C
Roxas City, Capiz – 44°C
San Jose, Occidental Mindoro – 43°C
Guiuian, Eastern Samar – 43°C
NAIA – 42°C
Iba, Zambales – 42°C
CLSU Muñoz, Nueva Ecija – 42°C
Cubi Point, Subic Bay, Olongapo City – 42°C
Sangley Point, Cavite – 42°C
Infanta, Quezon – 42°C
Alabat, Quezon – 42°C
Aborlan, Palawan – 42°C
Cuyo, Palawan – 42°C
Legazpi City, Albay – 42°C
Masbate City, Masbate – 42°C
CBSUA Pili, Camarines Sur – 42°C
Mambusao, Capiz – 42°C
Iloilo City, Iloilo – 42°C
Dumangas, Iloilo – 42°C
Catbalogan, Samar – 42°C
Catarman, Northern Samar – 42°C
Tacloban City, Leyte – 42°C
Dipolog, Zamboanga del Norte – 42°C
Under danger-level heat indices of 41°C to 51°C, heat cramps and heat exhaustion are likely.
Continued exposure to the sun could also cause heat stroke, PAGASA said.
Meanwhile, moderate to strong winds and moderate to rough seas will continue to prevail over the northern and western sections of Northern Luzon.
Elsewhere, winds will be light to moderate with slight to moderate seas. (PNA)