The onshore flow component of a tropical system is always bad because of the heavy rains and/or storm surges. It's usually worse if the onshore flow is at the southeast quadrant of the storm where the wind flow is from the southwest and has the potential to bring in warmer, moister air from the south. It's the same thing with Ondoy when it flooded Manila. I imagine that's what PAGASA means whenever they say a tropical system is intensifying the Southwest Monsoon.






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