Right now
The most recent data we hold from NOAA arrived 2 hours 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 3 June 2026 at 01:36 UTC. It is kept here as a record.
No stronger detection stands among the 23 recorded within 20 km of this point since 22 March 2026 — 10 others scored the same. Another comparable one was recorded here earlier the same day. 10 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued June 2 at 7:26PM MDT until June 2 at 7:30PM MDT by NWS Rapid City SD
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100, at 60 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 60% |
| Coordinates | 43.5735, -102.5319 |
| Nearest City | Rapid City (79 km) |
| Impact Tier | minor |
| Timestamp | 2026-06-03T01:26:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.4f5a4d07018bbc3b2f77732d7743773e |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Jackson, SD; Custer, SD; Oglala Lakota, SD; Fall River, SD; Oglala Lakota, SD |
| Headline | Flash Flood Warning issued June 2 at 7:26PM MDT until June 2 at 7:30PM MDT by NWS Rapid City SD |
| Expires | 2026-06-02T19:36:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4f5a4d07018bbc3b2f77732d7743773e69c4aadc.001.1","noaa_urn:oid:2.49.0.1.840.0.dc500c559caa48f2098eb004738f4165261f5408.001.1","noaa_urn:oid:2.49.0.1.840.0.46e0c585f8138a83f9c511f786b07f122206d157.001.1"] |
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.
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