Flood · American Samoa

Flooding was reported by NWS staff along Airport Road on October 22nd. Overflow from saturated drainage banks led to water encroaching onto NWS property and adjacent areas after receiving over two inches of rain in two hours as the grounds were already saturated.

On October 21'22, a subtropical high-pressure system to the south and a near-equatorial ridge to the north combined to enhance a trough over the American Samoa islands. This setup resulted in 6.26 inches of rainfall at WSO Pago Pago over a 48-hour period. With soils already saturated from well-above-average October rainfall and widespread poor stormwater drainage across the territory, impacts were significantly exacerbated. The event led to widespread flash flooding and landslides throughout American Samoa.