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A deluge caused by Typhoon Koppu in the northern Philippines is forecast to last until Wednesday.
The slow-moving typhoon has killed at least two people, forced more than 16,000 from their homes and caused extensive travel disruption, according to latest reports.
Troops have been deployed to help residents trapped on rooftops, but they are struggling to access more remote areas.
Dozens of flights were suspended and ferry services cut due to the stormy weather.
The typhoon made landfall near the town of Casiguran on the island of Luzon on Sunday morning, bringing winds of close to 124mph and cutting power to vast areas.
A teenager was killed by a fallen tree in Manila which also injured four others. A concrete wall collapsed in Subic town, northwest of Manila, killing a 62-year-old woman, officials reported.
By dawn on Monday local time, wind speeds were down to 93 mph in the northern town of Santiago, the state weather service said.
But rising floodwaters are preventing even military vehicles reaching many of the worst-hit villages and rescuers report a shortage of boats.
The typhoon is forecast to head towards Taiwan after leaving the north of the main island of Luzon on Wednesday.