First published Oct 17, 2026, 7:07:16 AM UTC · Last updated Oct 17, 2026, 7:07:16 AM UTC

Coastal Flood Warning issued October 17 at 4:31PM ChST until October 19 at 4:00AM ChST by NWS Tiyan GU

A coastal flood and high-surf warning covers Guam, Rota, Tinian, and Saipan from 5 PM October 17 until 4 AM October 19 ChST. The source forecasts inundation, dangerous waves, erosion, and possible road closures, and advises people to stay out of the water and away from the coast.

Why it matters

The forecast flooding and surf pose risks to people, coastal property, infrastructure, and road access across the affected islands.

Categories: severe-weather-and-natural-disasters, travel-and-transportation

Generated scores

Scores are based on the cited reporting and use a 1–10 scale. Read the methodology.

Confidence: 8/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 3/10How widely the event reaches, from a local area (1) to worldwide impact (10).
Global importance: 3/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 6/10The scale or severity of the real-world impact, from minor (1) to extreme (10).
Positivity: 1/10How harmful or beneficial the event is, from strongly harmful (1) to strongly positive (10).
Urgency: 8/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Primary official sources

U.S. National Weather Service Alerts NWS Coastal Flood Warning issued October 17 at 4:31PM ChST until October 19 at 4:00AM ChST by NWS Tiyan GU

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