Heat index of 44 °C to prevail in Pangasinan, Palawan, Capiz on Sunday

A sun halo, which is called "mariyes" in Batanes, appears in the skyline of Itbayat town on Tuesday (April 2)

A sun halo, which is called “mariyes” in Batanes appears in the skyline of Itbayat town on Tuesday, April 2, 2024. The solar phenomenon happens during a transition from cool to warm dry season heat. (File photo by NATHAN ALCANTARA)

MANILA, Philippines — Three areas are expected to hit the highest heat index on Sunday (April 21) at 44 degrees Celsius (°C), according to the Philippine Atmospheric, Geophysical, and Astronomical Services Administration (Pagasa).

Pagasa’s forecast said these areas are Dagupan City, Pangasinan; Aborlan, Palawan; and Roxas City, Capiz.

According to the state weather service, a 42 to 51°C heat index falls under the “danger” category and would likely cause heat cramps and heat exhaustion, while heat stroke is probable with continued heat or sun exposure.

Aside from the three areas, Puerto Princesa, Palawan and Guiuan, Eastern Samar, are also expected to experience extreme heat at 43°C.

Meanwhile, below are 10 areas that are expected to experience a danger level heat index at 42°C:

Bacnotan, La Union

Aparri, Cagayan

Tuguegarao City, Cagayan

San Jose, Occidental Mindoro

Iloilo City, Iloilo

Dumangas, Iloilo

Catarman, Northern Samar

The state weather service announced the arrival of the summer last March 23, signaling the end of the amihan or prevailing northeast monsoon, which had brought lower temperatures across the country.