MANILA, Philippines — Rain showers are expected across the country on Monday, Dec. 22, due to the effect of three weather systems – the northeast monsoon or locally known as amihan, the shear line and the easterlies, the state weather bureau said. Based on its morning forecast, the Philippine Atmospheric, Geophysical, and Astronomical Services Administration (Pagasa) said the shear line—which occurs when the cold and warm winds converge—is expected to bring cloudy skies with a high chance of scattered rains and thunderstorms over the following areas in Luzon:  READ: Cold weather to intensify anew on Monday, says Pagasa Pagasa Weather […]... Keep on reading: Rainy Monday forecast due to amihan, shear line and easterlies