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Flash Flood · American Samoa

Flash Flood May 18, 2026 · Tutuila, American Samoa

$30K
Damage as recorded

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Local media reported that heavy rainfall during the afternoon of the 18th caused multiple flooded homes in Nu'uuli village. An American Samoa Power Authority/University of Hawaii stream gauge in the village rapidly rose to over three times its initial height in a single hour. Fiscal damage is estimated.

The wider storm

A strong high pressure system centered to the south of Fiji moved a trough from the south of American Samoa onto the territorial islands on May 16th through the 18th. This stationary weather pattern lead to over 9.68 inches of rain recorded at WFO American Samoa. This includes 3.55 inches that fell in two hours on the afternoon of the 18th. This intense rainfall led to widespread flash flooding throughout the territory. Multiple landslides were also reported due to the intense rainfall on saturated soils.

Began near Vaitogi (-14.3227, -170.7293).

Source: NOAA Storm Events Database, event 1338711. Narratives are written by the National Weather Service forecast office that issued the report.

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