First published 9/19/2026, 11:16:15 AM · Last updated 9/27/2026, 6:48:30 PM

Special Marine Warning issued by NWS Tiyan (Guam)

National Weather Service (NWS) Tiyan issued a Special Marine Warning for Guam on September 19, listed as starting 9:11 PM ChST and ending 9:45 PM ChST. The warning indicates hazardous marine conditions affecting local waters during that period.

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: 9/10How 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: 6/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 4/10The 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).

Why it matters

Special Marine Warnings signal immediate marine hazards (e.g., dangerous winds, seas, or squalls) that threaten small craft and coastal operations. Mariners and coastal users in Guam should take shelter, avoid or delay marine activities, and follow local advisories.

Location

Sources

Special Marine Warning issued September 19 at 9:11PM ChST until September 19 at 9:45PM ChST by NWS Tiyan GU

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