Right now
The most recent data we hold from NOAA arrived 3 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
2 other detections within 20 km in the last 24 hours, the nearest 11 km from here.
This alert expired on 28 September 2026 at 20:30 UTC. It is kept here as a record.
It is one of only 3 we have recorded within 20 km of this point since 4 April 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued September 28 at 9:34AM CDT until September 28 at 3:30PM CDT by NWS Aberdeen SD
Nearby, since 4 April 2026
- September 5, 2026 · 7.5 km
- July 7, 2026 · 10.9 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.
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 | High |
| Calamity Score (ours) | 28 / 100 |
| Legacy data-support index | 0.60/1 |
| Coordinates | 45.8800, -100.4817 |
| Nearest City | Bismarck (106 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-28T14:34:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.28d9ff305482b4c577481455a1da49be084ea30a.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: 2026-09-28T14:34:00.000Z.
First archived: 2026-09-28T17:33:51.103Z. Material modification: 2026-09-28T18:00:39.669Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-28T18:00:39.669Z · data_change
Index 16 → 28; severity medium → high.
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:2.49.0.1.840.0.28d9ff305482b4c577481455a1da49be084ea30a.001.1 |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | Campbell, SD; Corson, SD |
| Headline | Flood Warning issued September 28 at 9:34AM CDT until September 28 at 3:30PM CDT by NWS Aberdeen SD |
| Expires | 2026-09-28T15:30:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | 71 |
| Spc Location | 2 WSW Pollock |
| Spc County | Campbell |
| Spc State | SD |
| Spc Comments | Public weather station observation. Time estimated by radar and nearby weather stations. (ABR) |
| Iem TypeSummary | Heavy rain |
| Iem LsrCode | R |
| Iem LsrType | RAIN |
| Iem Magnitude | 1.68 |
| Iem Unit | Inch |
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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