Flash Flooding from Tropical Storm Washi in Philippine Island of Mindanao

According to catastrophe modeling firm AIR Worldwide, Tropical Storm Washi pummeled the northern part of the Philippine island of Mindanao late Thursday night. Heavy rainfall from Washi (locally called Sendong) lasted for ten hours, after which flash flooding caused rivers to overflow and coastal cities to flood. In some locations of Mindanao, as much as 20 centimeters of rain fell within a 24 hour period-roughly four times as much rainfall as the region typically receives in the whole of December. In isolated locations, the storm delivered up to 50 millimeters…

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