Right now
The most recent data we hold from NOAA arrived 3 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 27 June 2026 at 03:30 UTC. It is kept here as a record.
It is the 31st strongest of the 85 detections recorded within 20 km of this point since 5 May 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued June 26 at 7:29PM MDT until June 26 at 9:30PM MDT by NWS Cheyenne WY
Nearby, since 5 May 2026
- August 29, 2026 · score 22 · 10.7 km
- June 1, 2026 · score 46 · 18.8 km
How we know
7 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 22 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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 |
| Legacy data-support index | 0.68/1 |
| Coordinates | 41.7525, -103.3758 |
| Nearest City | Cheyenne (138 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-27T01:29:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.61c7497c9d23863458f2fe6868160684 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-06-27T01:29:00.000Z.
First archived: 2026-06-27T02:45:52.810Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Scotts Bluff, NE; Morrill, NE |
| Headline | Flash Flood Warning issued June 26 at 7:29PM MDT until June 26 at 9:30PM MDT by NWS Cheyenne WY |
| Expires | 2026-06-26T21:30:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.61c7497c9d23863458f2fe6868160684c5180ce0.001.1","noaa_urn:oid:2.49.0.1.840.0.05b6914951fb262f8554154c84877cedcb21c471.001.1"] |
| 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_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_G_42.060_-102.890_1782522000000","source":"iem","severity":"low","severityValue":25,"timestamp":1782522000000,"latitude":42.06,"longitude":-102.89},{"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 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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