Right now
The most recent data we hold from NOAA arrived 4 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 01:45 UTC. It is kept here as a record.
It is the 3rd strongest of the 8 detections recorded within 20 km of this point since 14 April 2026. The last comparable one was on 6 July 2026.
What the source measured
NOAA reported: Flash Flood Warning issued September 9 at 10:50AM ChST until September 9 at 11:45AM ChST by NWS Tiyan GU
An estimated 48,220 people live within 50 km of this point.
Nearby, since 14 April 2026
- July 6, 2026 · score 34 · 3.6 km
- July 5, 2026 · score 34 · 7.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 28 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) | 28 / 100 |
| Our confidence | 81% |
| Coordinates | 15.0616, 145.6768 |
| Nearest City | Saipan (18 km) |
| Population Exposed | 48.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-09T00:50:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.7964aa131e64dd68bf69341670b63e01d689cf0f.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Saipan, MP; Tinian, MP |
| Headline | Flash Flood Warning issued September 9 at 10:50AM ChST until September 9 at 11:45AM ChST by NWS Tiyan GU |
| Expires | 2026-09-09T11:45:00+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.
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