Right now
The most recent data we hold from NOAA arrived 6 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 28 September 2026 at 17:30 UTC. It is kept here as a record.
It is the only one we have recorded within 20 km of this point since 3 April 2026. The last comparable one was on 17 August 2026.
What the source measured
NOAA reported: Flood Warning issued September 28 at 6:30AM CDT until September 28 at 12:30PM CDT by NWS Aberdeen SD
Nearby, since 3 April 2026
- June 19, 2026 · 18.9 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 16 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 16 / 100 |
| Legacy data-support index | 0.61/1 |
| Coordinates | 45.2120, -101.3680 |
| Nearest City | Bismarck (183 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-28T11:30:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.8b3757efb7b197ca45a2ee9f9ae692c9a0a30e8b.001.1 |
Physical priority index · v5. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-09-28T11:30:00.000Z.
First archived: 2026-09-28T11:37:18.575Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2 retained revisions changed source fields this page does not show; the index, severity and version stayed the same.
Score Breakdown
Technical Details
| Event | Flood Warning |
| MessageId | urn:oid:2.49.0.1.840.0.8b3757efb7b197ca45a2ee9f9ae692c9a0a30e8b.001.1 |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | Dewey, SD |
| Headline | Flood Warning issued September 28 at 6:30AM CDT until September 28 at 12:30PM CDT by NWS Aberdeen SD |
| Expires | 2026-09-28T12:30:00-05:00 |
| SenderName | NWS Aberdeen SD |
| 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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