Right now
The most recent data we hold from NOAA arrived 5 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 3 June 2026 at 01:00 UTC. It is kept here as a record.
No stronger detection stands among the 40 recorded within 20 km of this point since 22 March 2026 — 14 others scored the same. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued June 2 at 3:43PM MDT until June 2 at 7:00PM 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 | 43.5252, -102.3523 |
| Nearest City | Rapid City (94 km) |
| Impact Tier | minor |
| Timestamp | 2026-06-02T21:43:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.5cfacd9d3cea084dfc81b47ea60aefab |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Fall River, SD; Oglala Lakota, SD; Jackson, SD |
| Headline | Flash Flood Warning issued June 2 at 3:43PM MDT until June 2 at 7:00PM MDT by NWS Rapid City SD |
| Expires | 2026-06-02T19:00:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5cfacd9d3cea084dfc81b47ea60aefab7ba3999f.001.1","noaa_urn:oid:2.49.0.1.840.0.747420cd909f8d4c8280102a8200cd43efa6a4a5.001.1"] |
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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