Right now
The most recent data we hold from NOAA arrived 4 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 6 September 2026 at 10:45 UTC. It is kept here as a record.
It is the 8th strongest of the 21 detections recorded within 20 km of this point since 14 April 2026. The last comparable one was on 30 August 2026.
What the source measured
NOAA reported: Flash Flood Warning issued September 6 at 7:15PM ChST until September 6 at 8:45PM 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 · 4.7 km
- July 5, 2026 · score 43 · 7.5 km
- August 30, 2026 · score 43 · 9.8 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 | 13.4195, 144.6929 |
| Nearest City | Mangilao Village (12 km) |
| Population Exposed | 120.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-06T09:15:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.eef58e3a22e0c1563d3babc1ca8844e150abd9ea.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Guam, GU |
| Headline | Flash Flood Warning issued September 6 at 7:15PM ChST until September 6 at 8:45PM ChST by NWS Tiyan GU |
| Expires | 2026-09-06T20:45:00+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.
Want to know when something happens near Mangilao Village?
Calamity.live data shows a weather event with CalamityScore 37/100, near Mangilao Village (GU), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.