MANILA – The shear line and the northeast monsoon ... with rough to very rough seas and wave heights of 3.1 to 5 meters. For the rest of Luzon and the Visayas, moderate to strong winds will ...

“The convergence of warm and humid air with the northeast monsoon results in the shear line ... waters of Eastern and Northern Luzon, with wave heights possibly reaching 2.8 to 4 meters.