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Heat index is seen to reach 42 to 45 degrees Celsius in 37 areas nationwide on Friday, May 17.
The Philippine Atmospheric, Geophysical, and Astronomical Services Administration (Pagasa) said a 45-degree Celsius heat may be expected in Dagupan City in Pangasinan; Sangley Point, Cavite; San Jose, Occidental Mindoro; and Zamboanga City, Zamboanga del Sur.
Hot weather of up to 44 degrees Celsius is likely in Bacnotan, La Union; Roxas City, Capiz; Iloilo City, Iloilo; Dumangas, Iloilo; and Dipolog, Zamboanga del Norte while 43 degrees Celsius could be anticipated in Naia Pasay City, Metro Manila; Sinait, Ilocos Sur; ISU Echague, Isabela; Clark Airport (DMIA), Pampanga; Baler (Radar), Aurora; Puerto Princesa, Palawan; Cuyo, Palawan; Virac (Synop), Catanduanes; Guiuan, Eastern Samar; and Cotabato City, Maguindanao, the state weather agency added.