Right now
The most recent data we hold from NOAA arrived 6 minutes ago, and this point is in it.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 9 September 2026 at 02:45 UTC. It is kept here as a record.
It is the 10th strongest of the 24 detections recorded within 20 km of this point since 14 April 2026. The last comparable one was on 6 September 2026.
What the source measured
NOAA reported: Special Marine Warning issued September 9 at 12:08PM ChST until September 9 at 12:45PM ChST by NWS Tiyan GU
An estimated 120,043 people live within 50 km of this point.
Nearby, since 14 April 2026
- August 6, 2026 · score 43 · 12.7 km
- July 5, 2026 · score 43 · 13.6 km
- July 10, 2026 · score 43 · 15.7 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 | 13.3514, 144.8243 |
| Nearest City | Mangilao Village (11 km) |
| Population Exposed | 120.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-09T02:11:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.909df4658f3920bab88362a2af36f773e3bf1220.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Guam Coastal Waters |
| Headline | Special Marine Warning issued September 9 at 12:08PM ChST until September 9 at 12:45PM ChST by NWS Tiyan GU |
| Expires | 2026-09-09T12:45:00+10:00 |
| SenderName | NWS Tiyan GU |
| HasExactCoords | true |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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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