The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) forecasted that Guiuan, Eastern Samar may feel another 50 degrees Celsius (°C) heat index on Tuesday, May 21.
This forecast marks the fourth consecutive day of the city to experience a heat index of 50°C.
This is also 1°C lower than the 51°C heat index recorded on May 20 and only 2°C below the "extreme danger" category.
In an advisory, PAGASA said the heat index in Roxas City, Capiz may reach 47°C, while it is possible in Sangley Point, Cavite to experience 46°C.
Meanwhile, the heat index in Dagupan City, Pangasinan; Bacnotan, La Union; Ambulong, Tanauan Batangas; Virac (Synop), Catanduanes; Iloilo City, Iloilo; and Butuan City, Agusan Del Norte may reach 45°C, while it may reach 44°C in Ninoy Aquino International Airport (NAIA) Pasay City, Metro Manila; Science Garden Quezon City, Metro Manila; Laoag City, Ilocos Norte; Aparri, Cagayan; Tuguegarao City, Cagayan; ISU Echague, Isabela; Iba, Zambales; Aborlan, Palawan; Masbate City, Masbate; Dumangas, Iloilo; Catarman, Northern Samar; and Catbalogan, Samar.
Casiguran, Aurora; Cubi Pt., Subic Bay Olongapo City; Alabat, Quezon; Coron, Palawan; Cuyo, Palawan; Daet, Camarines Norte; Mambusao, Capiz; Maasin, Southern Leyte; Dipolog, Zamboanga Del Norte; Zamboanga City, Zamboanga Del Sur; and Cotabato City, Maguindanao may experience a 43°C heat index.
PAGASA added that CLSU Muñoz, Nueva Ecija; Baler (Radar), Aurora; Mulanay, Quezon; San Jose, Occidental Mindoro; Puerto Princesa City, Palawan; Legazpi City, Albay; CBSUA-Pili, Camarines Sur; La Granja, La Carlota, Negros Occidental; Panglao International Airport, Bohol; Siquijor, Siquijor; Tacloban City, Leyte; VSU-Baybay, Leyte; Borongan, Eastern Samar; Davao City, Davao Del Sur; and Surigao City, Surigao Del Norte may experience a 42°C heat index.
On May 21, 47 areas may reach the "danger" heat index.