MANILA, Philippines — Overcast skies and rain showers are expected in parts of Luzon on Monday due to the intertropical convergence zone, or ITCZ, and a low-pressure area (LPA) in the West Philippine Sea. Aldczar Aurelio, the weather specialist of the Philippine Atmospheric, Geophysical and Astronomical Services Administration (Pagasa), said Mimaropa, Quezon, Rizal, Laguna, and