Right now
The most recent data we hold from NOAA arrived 4 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
3 other detections within 20 km in the last 24 hours, the nearest 16 km from here.
This alert expired on 10 July 2026 at 01:34 UTC. It is kept here as a record.
No stronger detection stands among the 54 recorded within 20 km of this point since 5 May 2026 — 24 others scored the same. The last comparable one was on 9 July 2026. 14 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 9 at 7:24PM MDT until July 9 at 7:30PM MDT by NWS Cheyenne WY
Nearby, since 5 May 2026
- July 28, 2026 · score 22 · 7.0 km
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 | 42.3896, -103.0113 |
| Nearest City | Rapid City (189 km) |
| Impact Tier | minor |
| Timestamp | 2026-07-10T01:24:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.f8c5757a8a4386b3a3fae83bef4d2e19 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Box Butte, NE; Dawes, NE; Box Butte, NE |
| Headline | Flash Flood Warning issued July 9 at 7:24PM MDT until July 9 at 7:30PM MDT by NWS Cheyenne WY |
| Expires | 2026-07-09T19:34:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f8c5757a8a4386b3a3fae83bef4d2e19653a7f00.001.1","noaa_urn:oid:2.49.0.1.840.0.3e77197ddb63090447d88c680ca4d84ac8ca57d6.001.1"] |
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 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.