METRO Manila residents sweltered Friday as the heat index climbed to 39 degrees Celsius just days after summer officially began.

Weather forecaster Benison Estareja of the Philippine Atmospheric, Geophysical and Astronomical Services Administration (Pagasa) said two weather systems — the high-pressure area (HPA) and easterlies — were responsible for turning up the heat index, which measures the degree of discomfort a person experiences as temperature and humidity rise.

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