Thirteen locations recorded heat indices between 42 and 51 degrees Celsius (°C) that fall under the "danger" category on Friday, April 28, based on the monitoring of the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA).
The areas with the highest heat indices observed on Friday were Guiuan, Eastern Samar (47°C); Butuan City, Agusan del Norte (46°C); Catarman, Northern Samar (44°C); Legazpi City, Albay (44°C); Zamboanga City, Zamboanga del Sur (44°C); Masbate City, Masbate (43°C); Puerto Princesa City, Palawan (43°C); San Jose, Occidental Mindoro (43°C); Davao City, Davao del Sur (42°C); Dipolog, Zamboanga del Norte (42°C); Roxas City, Capiz (42°C); Sangley Point, Cavite (42°C); and Virac, Catanduanes (42°C).
(Graphics by PAGASA)
PAGASA defines the heat index as the measurement of how hot it feels when relative humidity is factored in with the actual air temperature.
It said heat indices between 42°C and 51°C carry impending “danger” as “heat cramps and heat exhaustion are likely” and “heat stroke is probable with continued activity.”
Meanwhile, PAGASA's three monitoring stations in Metro Manila, the Ninoy Aquino International Airport in Pasay City, Science Garden in Quezon City, and Port Area in Manila, recorded heat indices of 41°C, 38°C, and 40℃, respectively.
PAGASA said observe “extreme caution” when heat indices reach 32°C to 41°C, as “heat cramps and heat exhaustion are possible” and “continuing activity can result in heatstroke.”
Based on PAGASA’s data, the highest heat index recorded since March 1, 2023, was 49℃ in Guiuan, Eastern Samar, on April 16.
In the next 24 hours, PAGASA said the entire country will continue to experience partly cloudy to cloudy weather with isolated rain showers or thunderstorms, mostly in the afternoon or evening.