Flash Flood in American Samoa, June 10 to 11, 2021

Name: Flash Flood in American Samoa, June 10 to 11, 2021
Start: 2021-06-10T00:00
End: 2021-06-11T00:00
Location: American Samoa

June 10 to 11, 2021 · NWS ASO · 1 event in 1 county or zone

A frontal boundary lingering over the territory up to five consecutive days, caused heavy rainfall that led to grounds becoming saturated and eventually resulted to flash flooding in low-lying areas.

Where it happened

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Tornadoes
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Wind
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Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
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The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: $10,000
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 frontal boundary lingering over the territory up to five consecutive days, caused heavy rainfall that led to grounds becoming saturated and eventually resulted to flash flooding in low-lying areas.

The radar

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

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Event by event

1 flash flood. Local standard time, as filed.

Flash Flood, Tutuila

When: June 10, 12:00 AM SST to June 11, 12:00 AM SST
Where: Tutuila County, 5.02 mi NNW of Vaitogi to 4.72 mi N of Vaitogi
Cause: Heavy Rain
Crop damage: $10,000
Reported by: Official NWS Observations
Coordinates: -14.329, -170.717

Rain gauge indicated 2.80 inches of rain over a 24 hour period, which led to three flash flood warnings issued throughout the day. Flash Flooding was reported in areas with poor drainage systems such as the front of cost u less, ottoville, and the golf course.

What these are

Flash Flood: Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

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

The same day elsewhere

Every storm in American Samoa in 2021 Every state in 2021 This day in weather history Warnings in American Samoa, June 2021

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: 970649.