Flash Flood in American Samoa, September 17 to 18, 2018

Name: Flash Flood in American Samoa, September 17 to 18, 2018
Start: 2018-09-17T00:00
End: 2018-09-18T00:00
Location: American Samoa

September 17 to 18, 2018 · NWS ASO · 1 event in 1 county or zone

Synoptic: Dissipating frontal boundary lingering near the Samoan Islands.

Where it happened

Every event with a place to put it. Tap one for its entry below.

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: $10,000
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.

Synoptic: Dissipating frontal boundary lingering near the Samoan Islands.

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: September 17, 12:00 AM SST to September 18, 12:00 AM SST
Where: Tutuila County, 11.91 mi NNE of Pago Pago to 13.27 mi NW of Vaitogi
Cause: Heavy Rain
Property damage: $10,000
Reported by: Official NWS Observations
Coordinates: -14.133, -170.558

WSO Pago Pago recorded .45 within the hour that prompted a Small Stream Flood Advisory on the 17th. Another episode of .38 or rainfall was recorded within the hour on the 18th that also prompted the issuance of a Small Stream Flood Advisory. Due to the same episode.

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 2018 Every state in 2018 This day in weather history Warnings in American Samoa, September 2018

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: 808610.