This alert expired on 27 June 2026 at 06:00 UTC. It is kept here as a record.
No stronger detection stands among the 37 recorded within 20 km of this point since 5 May 2026 — 11 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 26 at 9:31PM MDT until June 27 at 12:00AM MDT by NWS Cheyenne WY
Nearby, since 5 May 2026
- July 28, 2026 · score 22 · 17.8 km
- August 29, 2026 · score 22 · 24.6 km
How we know
Confirmed by 10 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 70 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 70% |
| Coordinates | 41.6767, -103.0867 |
| Nearest City | Cheyenne (156 km) |
| Impact Tier | minor |
| Timestamp | 2026-06-27T03:31:00.000Z |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Morrill, NE |
| Headline | Flash Flood Warning issued June 26 at 9:31PM MDT until June 27 at 12:00AM MDT by NWS Cheyenne WY |
| Expires | 2026-06-27T00:00:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| Iem TypeSummary | F |
| Iem City | Bridgeport |
| Iem County | Morrill |
| Iem State | NE |
| Iem Wfo | CYS |
| Iem Remark | Social media image showed rain gauge measurement of 1.75 inches. |
| MergedSources | [{"id":"iem_G_41.900_-103.680_1782526620000","source":"iem","severity":"low","severityValue":25,"timestamp":1782526620000,"latitude":41.9,"longitude":-103.68},{"id":"iem_R_41.660_-103.090_1782525360000","source":"iem","severity":"low","severityValue":25,"timestamp":1782525360000,"latitude":41.66,"longitude":-103.09},{"id":"iem_R_41.660_-103.100_1782524700000","source":"iem","severity":"low","severityValue":25,"timestamp":1782524700000,"latitude":41.66,"longitude":-103.1},{"id":"iem_F_41.760_-103.710_1782518100000","source":"iem","severity":"low","severityValue":25,"timestamp":1782518100000,"latitude":41.76,"longitude":-103.71},{"id":"iem_G_42.060_-102.890_1782522000000","source":"iem","severity":"low","severityValue":25,"timestamp":1782522000000,"latitude":42.06,"longitude":-102.89},{"id":"iem_H_41.710_-103.680_1782516840000","source":"iem","severity":"low","severityValue":25,"timestamp":1782516840000,"latitude":41.71,"longitude":-103.68},{"id":"iem_F_41.670_-103.100_1782523080000","source":"iem","severity":"low","severityValue":25,"timestamp":1782523080000,"latitude":41.67,"longitude":-103.1},{"id":"iem_G_42.060_-102.890_1782518400000","source":"iem","severity":"low","severityValue":25,"timestamp":1782518400000,"latitude":42.06,"longitude":-102.89},{"id":"iem_F_41.660_-103.090_1782525360000","source":"iem","severity":"low","severityValue":25,"timestamp":1782525360000,"latitude":41.66,"longitude":-103.09}] |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 22/100, near Cheyenne (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.