MANILA— Several areas in Luzon and the Visayas may experience scattered rains and thunderstorms on Tuesday, with possible flash floods and landslides due to moderate to at times heavy rainfall, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) said. In its 4 a.m. weather forecast, PAGASA said the Bicol Region, Western Visayas, Eastern Visayas,…