The Philippine Atmospheric, Geophysical and Astronomical Services Administration’s (PAGASA) monitoring showed that the highest heat index in Metro Manila was 44°C at the Ninoy Aquino International Airport (NAIA) in Pasay City, followed by 41°C at the Science Garden monitoring station in Quezon City, and 40°C in Port Area, Manila.
The heat index is the measurement of how hot it feels when relative humidity is factored in with the actual air temperature.
Aparri, Cagayan and Sangley Point, Cavite recorded the highest heat index values on Monday at 47°C.
The top 19 stations that reached “dangerous” heat index levels on Monday were:
Aparri, Cagayan (47°C, 11 a.m.)
Sangley Point, Cavite (47°C, 2 p.m.)
Dagupan City, Pangasinan (46°C, 2 p.m.)
Laoag City, Ilocos Norte (45°C, 2 p.m.)
Ambulong, Batangas (44°C, 2 p.m.)
NAIA, Pasay City (44°C, 2 p.m.)
Tuguegarao City, Cagayan (44°C, 2 p.m.)
Clark Airport, Pampanga (43°C, 2 p.m.)
San Jose, Occidental Mindoro (43°C, 11 a.m.)
Casiguran, Aurora (42°C, 2 p.m.)
Dipolog, Zamboanga del Norte (42°C, 2 p.m.)
Zamboanga City, Zamboanga del Sur (42°C, 3 p.m.)
Catbalogan, Western Samar (41°C, 2 p.m.)
Cubi Pt., Subic Bay, Olongapo City (41°C, 5 p.m.)
Dauis, Bohol (41°C, 2 p.m.)
Davao City, Davao del Sur (41°C, 12 p.m.)
Iba, Zambales (41°C, 2 p.m.)
Masbate City, Masbate (41°C, 2 p.m.)
Science Garden, Quezon City (41°C, 2 p.m.)
A heat index between 41℃ and 54℃ is considered “dangerous” levels due to the high likelihood of heat cramps and heat exhaustion.
The highest heat index so far in 2021 was recorded in Dagupan City, Pangasinan on May 14 at 53℃.
On Tuesday, May 18, PAGASA said the intertropical convergence zone will bring scattered rain showers and thunderstorms over Davao de Oro, Davao del Norte, Davao del Sur, Davao Oriental, Davao Occidental, South Cotabato, Cotabato, Sultan Kudarat, Sarangani, Biliran, Leyte, Northern Samar, Samar, Eastern Samar, Southern Leyte, Surigao del Norte, and Surigao del Sur.
The rest of the country will continue to experience hot and humid weather conditions due to the prevalence of warm easterly winds.
However, there is a chance of isolated rain showers or thunderstorms by afternoon or evening.
Due to the possibility of sudden heavy rains during severe thunderstorms, PAGASA advised the public to take necessary precautionary measures in case flooding or landslides occur.