Right now
The most recent data we hold from NOAA arrived 67 minutes ago, and this point is in it.
3 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert expired on 9 September 2026 at 08:06 UTC. It is kept here as a record.
It is the 9th strongest of the 28 detections recorded within 20 km of this point since 14 April 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Flash Flood Warning issued September 9 at 5:56PM ChST until September 9 at 6:00PM ChST by NWS Tiyan GU
An estimated 120,043 people live within 50 km of this point.
Nearby, since 14 April 2026
- July 5, 2026 · score 43 · 0.5 km
- September 6, 2026 · score 37 · 7.5 km
- August 30, 2026 · score 43 · 8.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 37 out of 100, at 81 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 37 / 100 |
| Our confidence | 81% |
| Coordinates | 13.4562, 144.7514 |
| Nearest City | Tamuning-Tumon-Harmon Village (5 km) |
| Population Exposed | 120.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-09T07:56:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.3bd5d8b8394d2a6ad7a72fb60ea7fbb889b5392e.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Guam, GU |
| Headline | Flash Flood Warning issued September 9 at 5:56PM ChST until September 9 at 6:00PM ChST by NWS Tiyan GU |
| Expires | 2026-09-09T18:06:00+10:00 |
| SenderName | NWS Tiyan GU |
| HasExactCoords | true |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
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