Heat index in 39 areas reached 'danger' level on May 21

The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) said the intense heat reached a "dangerous" level in 39 areas on Tuesday, May 21.
PAGASA reported that Aparri, Cagayan recorded the highest heat index of the day at 47 degrees Celsius (°C).
Meanwhile, the heat index reached 46°C in Laoag City, Ilocos Norte; Virac, Catanduanes; and Roxas City, Capiz; and 45°C in Iloilo City, Iloilo; Dumangas, Iloilo; Catarman, Northern Samar; and Butuan City, Agusan del Norte.
A heat index of 44°C was logged in Dagupan City, Pangasinan; Bacnotan, La Union; Sangley Point, Cavite; Ambulong, Tanauan, Batangas; San Jose, Occidental Mindoro; Puerto Princesa City, Palawan; Cuyo, Palawan; Guiuan, Eastern Samar; and Maasin, Southern Leyte.
Meanwhile, it reached 43°C in Tuguegarao City, Cagayan; NAIA, Pasay City; MMSU, Batac, Ilocos Norte; Iba, Zambales; Cubi Pt., Subic Bay, Olongapo City; Alabat, Quezon; Coron, Palawan; Aborlan, Palawan; Masbate City, Masbate; La Granja, La Carlota, Negros Occidental; Siquijor, Siquijor; and Dipolog, Zamboanga del Norte.
The heat index also reached 42°C in Science Garden, Quezon City; Sinait, Ilocos Sur; Calayan, Cagayan; ISU, Echague, Isabela; CLSU, Muñoz, Nueva Ecija; Daet, Camarines Norte; Legazpi City, Albay; Catbalogan, Samar; Tacloban City, Leyte; and Cotabato City, Maguindanao.
PAGASA warned that heat indices between 42 degrees Celsius (°C) and 51°C indicate “danger,” as "heat cramps and heat exhaustion are likely," and "heat stroke is probable with continued activity."
The heat index measures how hot it feels when relative humidity is combined with the actual air temperature.
READ MORE: https://mb.com.ph/2024/3/18/heat-index-what-is-it-and-how-does-it-differ-from-actual-temperature
On April 28, Iba, Zambales recorded the highest heat index so far this year at 53°C.
PAGASA said a heat index above 52°C indicates “extreme danger” as “heat stroke is imminent.”