MANILA – The southwest monsoon is expected to bring scattered rains and thunderstorms to several areas in Luzon on Friday, with the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) warning of possible flash floods and landslides. In its 4 a.m. weather forecast, PAGASA said Ilocos Norte, Ilocos Sur, Apayao, Abra, Batanes, and Cagayan will…