Key facts
- Alert
- Coastal Flood Warning (severe)
- Issued by
- National Weather Service, Tiyan GU
- Areas
- Guam; Rota; Tinian; Saipan
- In effect
- until 4:00 AM GMT+10, Oct 19, 2026
What the National Weather Service says
“Everyone should remain out of the water due to life-threatening surf conditions.”
NWS Tiyan GU, Coastal Flood Warning, 4:31 PM GMT+10 Oct 17, 2026 · official alert
“Stay well away from the coast.”
NWS Tiyan GU, Coastal Flood Warning, 4:31 PM GMT+10 Oct 17, 2026 · official alert
“Numerous roads may be closed.”
NWS Tiyan GU, Coastal Flood Warning, 4:31 PM GMT+10 Oct 17, 2026 · official alert
What to do
Stay out of the water. The National Weather Service says surf conditions are life-threatening. Stay well away from the coast, including beaches and shoreline rocks.
Expect road closures and flooding in low-lying areas. Move to higher ground if water starts to rise. Never drive around barricades or into flooded roads. Just 6 inches of moving water can knock you down, and 1 foot can sweep a vehicle away.
Surf is expected to rise rapidly tonight. Impacts on the western coasts of Guam and Rota depend on the final track of Champi, so keep checking National Weather Service updates.
Context
FEMA records show 182 flood-insurance claims in Guam from 1980 to 2026. This count covers only insured properties, so it understates total flood damage.
FEMA has made several typhoon disaster declarations for Guam, including super typhoon Bavi on October 7, 2026 and super typhoon Sinlaku on June 30, 2026.
Updates
- The coastal flood warning is no longer in effect.
- The National Weather Service updated the coastal flood warning; it remains in effect until 4:00 AM GMT+10.
- The National Weather Service updated the coastal flood warning; it remains in effect until 4:00 AM GMT+10.
- NWS Tiyan GU issued the coastal flood warning until 4:00 AM GMT+10.
History here
This county: 182 flood insurance claims in FEMA's National Flood Insurance Program records since 1980, most recent 2026.
This county: recent federal disaster declarations
- DR-4946 (2026): super typhoon bavi
- DR-4921 (2026): super typhoon sinlaku
- DR-4715 (2023): typhoon mawar
- DR-4433 (2019): typhoon wutip
- DR-4398 (2018): typhoon mangkhut
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Questions
- Is there a coastal flood warning in Guam?
- Yes. The National Weather Service issued a Coastal Flood Warning for Guam, Rota, Tinian and Saipan, in effect from 5 PM Saturday to 4:00 AM GMT+10 Monday.
- How high could the water get in Guam?
- Coastal inundation of 5 to 7 feet is possible on Guam, 2 to 4 feet on Rota, and 1 to 3 feet on Tinian and Saipan. Breaking waves of up to 35 feet are expected on Guam.
- What should I do during the Guam coastal flood warning?
- Stay out of the water and well away from the coast. Numerous roads may be closed, so avoid flooded roads and move to higher ground if needed.
Sources
- NWS Tiyan GU: Coastal Flood Warning, Oct 17, 2026 weather.gov
- FEMA OpenFEMA: NFIP claims and disaster declarations fema.gov
How this page is made. The Herebeat Hazard Desk builds event pages from official U.S. government data (National Weather Service, USGS, FEMA). The text is written with AI from that data; every number and quote is checked against the official source automatically before publishing, and the page is updated when the agency updates the event. The official source is always the reference. Spotted a mistake? info@herebeat.app. About the Hazard Desk.