MANILA, Nov. 20 -- Three weather systems will bring rain in most parts of the country on Thursday, as the weather bureau issues a heavy rainfall outlook in Apayao and Cagayan provinces.

In its bulletin issued at 4 a.m., the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) said the intertropical convergence zone (ITCZ) is affecting southern Mindanao, the shear line in the eastern section of northern Luzon, and the northeast monsoon or "amihan", the rest of northern Luzon.

Due to the ITCZ, Davao Region, Soccsksargen, Basilan, Sulu, Tawi-Tawi, and Palawan will get cloudy skies with scattered rains and thunderstorms.

The shear line will bring cloudy skies with scattered rains and isolated thunderstorms ...