The heat index in Guiuan, Eastern Samar, reaches 49°C on Wednesday, May 22.
Watch this video to learn how PAGASA determines heat index levels:
https://www.rappler.com/nation/weather/video-pagasa-heat-index-measurement-process/Let’s chat too! Join the environment and science chat room of the #RapplerCommunities app: https://rplr.co/EnviScienceChat
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