First published 9/19/2026, 10:57:15 AM · Last updated 9/19/2026, 10:57:15 AM

Flash Flood Warning issued September 19 at 8:49PM ChST until September 19 at 9:45PM ChST by NWS Tiyan GU

The U.S. National Weather Service office at Tiyan, Guam issued a Flash Flood Warning beginning September 19 at 8:49 PM ChST (2026-09-19T10:49:00Z) and valid until 9:45 PM ChST the same night. The warning covers Guam; residents and travelers should expect sudden flooding and hazardous travel conditions during the warning 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: 5/10The 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: 9/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Why it matters

Flash floods can rapidly inundate roads, low-lying areas, and structures, posing immediate danger to life and disrupting travel and local services. Official warnings indicate imminent risk and warrant precautions such as avoiding flooded roads and seeking higher ground.

Location

Sources

Flash Flood Warning issued September 19 at 8:49PM ChST until September 19 at 9:45PM ChST by NWS Tiyan GU

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