American Samoa, 2025

Flood in American Samoa, November 20, 2025

November 20, 2025 · NWS ASO · 1 event in 1 county or zone

A strong trough produced slow-moving thunderstorms across American Samoa from the overnight hours of November 19th through midday November 20th. Weak steering flow supported repeated cell development over the same areas, resulting in enhanced rainfall.

Where it happened

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  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
1

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS ASO wrote it up.

A strong trough produced slow-moving thunderstorms across American Samoa from the overnight hours of November 19th through midday November 20th. Weak steering flow supported repeated cell development over the same areas, resulting in enhanced rainfall. These storms generated localized heavy rainfall, with WSO Pago Pago measuring 2.85 inches in 36 hours. Soils were already saturated from persistent above-average rainfall throughout October and November. The combination of renewed heavy rainfall and saturated antecedent conditions led to flooding impacts across the territory and contributed to a landslide on Tutuila Island.

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

1 flood. Local standard time, as filed.

Flood, Tutuila

When
November 20, 3:00 AM SST to 10:00 AM SST
Where
Tutuila County, 7.61 mi NW of Vaitogi to 6.72 mi NW of Vaitogi
Cause
Heavy Rain
Reported by
NWS Employee
Coordinates
-14.332, -170.789

An NWS employee reported a landslide in Leone Village during the morning of November 20th. Dirt and debris blocked both ends of the main roadway through the village. A nearby University of Hawaii/American Samoa Power Authority rainfall gauge located in Aasu Village, approximately one mile north of the landslide site, recorded 1.71 inches of rainfall between 3:00 AM and 10:00 AM. This short-duration heavy rainfall, combined with already saturated soils following multiple weeks of above-average rain, likely contributed to the resulting landslide.

What these are

Flood
Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in American Samoa in 2025Every state in 2025This day in weather historyWarnings in American Samoa, November 2025

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1298843.