High air temperatures and high relative humidity will give high heat indices. The Pagasa has warned that a heat index of 41°C to 54°C is already considered as “dangerous,” with heat cramps and heat exhaustion likely, and heat stroke probable with continued activity under the sun. A heat index above 54°C is “extremely dangerous,” with heat stroke imminent. The same heat index levels were observed in the 11 areas on Thursday. Meanwhile, heat indices of 32°C to 41°C calls for “extreme caution,” exposure to which could cause heat cramps and heat exhaustion.

Source: Philippine Daily Inquirer April 13, 2018 09:45 UTC