Manila, May 10 -- The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) on Saturday warned of dangerous heat index levels in 31 areas.

In its 4 a.m. forecast, PAGASA said the following areas may have heat indices ranging from

NAIA Pasay City - 42 C Laoag, Ilocos Norte - 43 C Dagupan City, Pangasinan - 42 C MMSU Batac, Ilocos Norte - 42 C Bacnotan, La Union - 42 C Aparri, Cagayan - 44 C Tuguegarao City, Cagayan - 43 C Casiguran, Aurora - 42 C Iba, Zambales - 43 Cubi Point, Subic Bay, Olongapo City - 43

PAGASA said heat index is what the temperature feels like to the human body when relative humidity combines with air temperature.

The weather bureau advised the public to limit the time spent outdo...