The typhoon up north may not batter Manila with its winds. But, it can intensify the Southwest Monsoon with its rotational flow and feeder bands as it passes up north.
That's why the forecast at the airport there have added chances for showers at night.
Normally, the showers/thunderstorms occur during the day because of daytime heating without anything else going on. But, the extra dynamics provided by the typhoon is pushing more moisture from offshore. The clouds then start building as they undergo orographic lifting from higher terrain inland.
During the day, add the additional element of daytime heating. Probably see increased chances of thunderstorms in the afternoon.





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