Right now
The most recent data we hold from NOAA arrived 7 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 23:04 UTC. It is kept here as a record.
It is the 4th strongest of the 15 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 2 July 2026.
What the source measured
NOAA reported: Flash Flood Warning issued September 6 at 5:54PM CDT until September 6 at 6:00PM CDT by NWS Sioux Falls SD
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, at 59 % 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) | 16 / 100 |
| Our confidence | 59% |
| Coordinates | 42.7411, -95.5082 |
| Nearest City | Sioux City (78 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-06T22:54:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.26f9b4e8da15aa17952a05005ecf5acc1600c83e.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Brookings, SD; Minnehaha, SD; Moody, SD; Cherokee, IA; Emmet, IA; Palo Alto, IA and 2 more areas |
| Headline | Flash Flood Warning issued September 6 at 5:54PM CDT until September 6 at 6:00PM CDT by NWS Sioux Falls SD |
| Expires | 2026-09-06T18:04:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.26f9b4e8da15aa17952a05005ecf5acc1600c83e.001.1","noaa_urn:oid:2.49.0.1.840.0.9f2d083125ee44d46fb7469fb0d6d964baba61c6.001.1","noaa_urn:oid:2.49.0.1.840.0.e50ceaa837dc1c15ba5e009c50d224d4a557b915.001.1","noaa_urn:oid:2.49.0.1.840.0.9dd001de44f9edf430679760b487b91af65f0fa2.001.1","noaa_urn:oid:2.49.0.1.840.0.8e31e2260193ef0992e9e8ac48558b24236e1185.001.1"] |
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 in this area?
Calamity.live data shows a weather event with CalamityScore 16/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.