MANILA – Many areas in the country will experience rain showers due to the northeast monsoon or "amihan" and the shear line, the weather bureau said Tuesday. Scattered rain showers and thunderstorms due to the shear line -- the convergence of cold and warm winds which trigger rains -- will prevail over Eastern Visayas, Caraga and Davao Oriental. The northeast monsoon will bring rain showers over Quezon and Bicol Region. These areas may experience flash floods or landslides due to moderate to heavy rains, Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) said. Palawan and the rest of the Visayas and Mindanao will have isolated rain showers caused by localized thunderstorms. PAGASA said flash floods or landslides are also possible in these areas during severe thunderstorms. Metro Manila and the rest of Luzon will have light rains due to the northeast monsoon. Meanwhile, the whole country will continue to experience moderate to strong winds and moderate to rough seas. Rough to very rough seas are forecast over the northern, eastern and western seaboards of Luzon, and the eastern and western seaboards of the Visayas.  Fishing boats and other small sea vessels are advised not to venture into the sea, and larger sea vessels are alerted against big waves, PAGASA said.