Soaking rain will pelt Manila and parts of northern Philippines as Typhoon Usagi plows westward through the Luzon Strait.
Western and northern Luzon will be most prone to flooding between Friday and Monday as Usagi tracks toward southern Taiwan and south China.
At the same time, the brunt of the powerful storm's severe winds should, in the Philippines, strike only some small far-northern islands and perhaps the northern tip of mainland Luzon.
Rainfall could be heavy enough to trigger flooding in the capital region of the Philippines, which was inundated by literally feet of rainfall at the middle of August. At that time, extreme rainfall and widespread major flooding was sparked indirectly by Tropical Storm Trami (known as Maring in the Philippines), the center of which actually stayed hundreds of miles north of the Philippines.
Usagi, like Trami before it, will unleash heavy rain as it activates and strengthens the southwesterly monsoon wind flow over the South China Sea and the Philippines. Whenever this happens, these wet tropical winds typically get wrung out between the west coast and the mountain spine that runs the length of Luzon. Manila is well placed to get a soaking under such circumstances.
The vast metropolitan area of Manila, low-lying and crossed by many waterways, is prone to flooding during the heavy rains of the summer monsoon.
As for the fate of Usagi, the powerful storm will pose a serious threat of damaging wind and flooding rain to both Taiwan and South China along and near its direct path on Saturday through Monday.