First published Oct 19, 2026, 1:38:16 AM UTC · Last updated Oct 19, 2026, 1:38:16 AM UTC

Coastal and marine hazards

Special Marine Warning issued October 19 at 11:09AM ChST until October 19 at 12:00PM ChST by NWS Tiyan GU

Reported by U.S. National Weather Service Alerts NWS

The National Weather Service in Tiyan issued a warning for Guam and Rota coastal waters after a strong thunderstorm was located over southeast Guam coastal waters, with gusts of at least 34 knots. The warning instructed small craft to move to safe harbor immediately; the storm was expected to remain mainly over open waters.

At a glance

Affected location: Guam Coastal Waters and Rota Coastal Waters

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Why it matters

The warning directs small craft in the affected waters to seek safe harbor immediately because of gusty winds and high waves.

Location

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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: 2/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 3/10The scale or severity of the real-world impact, from minor (1) to extreme (10).
Positivity: 2/10How harmful or beneficial the event is, from strongly harmful (1) to strongly positive (10).
Urgency: 9/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Primary official sources

U.S. National Weather Service Alerts NWS Special Marine Warning issued October 19 at 11:09AM ChST until October 19 at 12:00PM ChST by NWS Tiyan GU

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NWS Tiyan issues Special Marine Warning for Guam and Rota Coastal WatersOct 19, 2026, 12:41 AM UTC
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