Flood in American Samoa
Every flood event the National Weather Service has filed in American Samoa, year by year, with the most significant episodes. Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
The most significant on the map
The most significant flood episodes in American Samoa.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The record
- Events
- 51
- Deaths
- 0
- Injuries
- 0
- Damage
- $322,000
Every year
The most significant
Ranked by deaths, injuries, damage and size together.
- Flash Flooding and Flood in American Samoa, January 5 to 10, 2025From January 6th through January 10th, a strong South Pacific Convergence Zone (SPCZ) strengthened over the American Samoa islands. WSO Pago Pago recorded 16.33 inches of rain during these 5 days and 21.39 inches of rainfall was measured from Jan 04th through the 10th.
- Flash Flooding and Flooding in American Samoa, February 17 to 22, 2025From the evening of February 16th to the morning of February 22nd, a strong South Pacific Convergence Zone (SPCZ) moved over Tutuila, Aunu'u, and the Manu'a islands of American Samoa, bringing sustained heavy rainfall and high winds across the territory.
- Flash Flood and Flood in American Samoa, May 17, 2023A strong trough moved over the American Samoa islands on May 17th to cause widespread flash flooding in the region.
- Flash Flooding and Flood in American Samoa, October 22, 2025On 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.
- Flash Flood and Flood in American Samoa, September 7 to 8, 2004Heavy rain caused street ponding and flooding in some villages. An unstable air mass aloft, well- associated with a trough connected to a strong gale low within 360 miles southwest of Pago Pago, remained over the Samoan Islands within 24 hours. No damages or injuries reported.
- Flood in American Samoa, September 15 to 16, 1999Mover heavy showers added on already saturated grounds again caused mud and land slide along the Poloa-Fagamalo road and widespread flooding of low lying areas as well as overflow of streams.
- Flood in American Samoa, April 19, 2002Heavy showers caused widespread flooding across the territory marking one of the wettest Flag Day in recent memories. More than two inches of rainfall fell between 10 AM and Noon Friday, April 19, 2002 in the final and activity packed day of the Flag Day celebration of 2002.
- Flood in American Samoa, June 13, 2003Heavy showers fell on the territory from an active trough of low pressure over Samoa.
- Flooding in American Samoa, January 4, 2025A slow moving thunderstorm moved over Tutuila island on the afternoon and evening hours on January 4th. WSO Pago Pago recorded 3.5 inches of rain between 3:50 PM and 6:50 PM. This led to multiple reports of flooding in the region.
- Flood in American Samoa, September 15, 1999The heavy showers associated with a stationary trough flooded and overflow many of the streams. Mud and landslides occurred at Poloa and Fagamalo causing temporary blockage of the road.
- Flood in American Samoa, December 19, 2024Strong wind convergence enhanced a trough throughout the day to give enhanced rainfall over the American Samoa islands. On December 19th, WSO Pago Pago recorded 2.08 inches of rainfall throughout the day.
- Flooding in American Samoa, November 23 to 24, 1999An active trough of low pressure that extends onto the islands from the southwest spread heavy showers with scattered thunderstorms over the territory with rainfall totals of 2.92 inches for the day.
- Flooding in American Samoa, October 11 to 14, 2000A convergence zone just to the north of American Samoa coupled with a moist southwest flow aloft over the territory spread heavy showers over islands from Tuesday to Saturday.
- Flooding in American Samoa, November 20 to 21, 2000A stationary trough of low pressure over American Samoa spread heavy showers over the territory causiong locallize flooding of low lying areas and overflow streams ditches. Debris were washed onto the road creating hazardous driving conditions.
- Flooding in American Samoa, December 25 to 26, 2001An active trough of low pressure was oriented northwest to southeast about 200-300 miles to the north of Samoa through the last 10 days.
- Flooding in American Samoa, May 26, 2002Heavy showers dumped 2.09 inches of rainfall in less than 4 hours causing flooding of low lying areas and streets. The heavy showers and runoffs caused overflow of streams and flooding of strees and low lying areas.
- Flooding in American Samoa, December 26, 2005A convection in the vicinity of the Islands increased immensely in the early hours which produced a lot of rain across Tutuila and Manu'a Islands. Flooding of roadways especially villages prone to flooding inTutuila reported stalled vehicles and traffic congestion.
- Flooding in American Samoa, December 21, 2005Occasional showers caused ponding along roadways and overflow of small streams near mountainous areas. A total precipitation of 3.06 inches was recorded at the Weather Service Office for this activity. No injury reported.
- Flood and Heavy Rain in American Samoa, May 25, 2025A trough lingered over the American Samoa islands on May 24th and May 25th. During this time, WSO Pago Pago recorded 3.27 inches of rain.
- Flood in American Samoa, September 25 to 26, 1998Heavy storms brought floods to several villages island wide, especially homes near stream.
- Flood in American Samoa, May 12 to 13, 1999An active trough of low pressure over Samoa produced heavy rain, which caused flooding and landslides across Tutuila. Some homes were flooded with the significant rise of water.
- Flood in American Samoa, December 2, 1999
- Flood in American Samoa, December 28, 1999
- Flood in American Samoa, July 12 to 13, 1999
- Flood in American Samoa, March 5 to 6, 2000Heavy showers associated with a tropical depression far south of Samoa fell across the territory Sunday afternoon to Monday morning. The Weather Station Office at Tafuna Airport recorded 8.18 inches of rainfall from Sunday afternoon to Monday afternoon.
More
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.