Right now
The most recent data we hold from NOAA arrived 20 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 6 September 2026 at 03:45 UTC. It is kept here as a record.
It is the 4th strongest of the 98 detections recorded within 20 km of this point since 5 May 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Flash Flood Warning issued September 5 at 6:41PM MDT until September 5 at 9:45PM MDT by NWS Cheyenne WY
Nearby, since 5 May 2026
- September 6, 2026 · score 28 · 10.2 km
- June 27, 2026 · score 22 · 10.4 km
- June 2, 2026 · score 46 · 18.6 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 28 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 v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | High |
| Calamity Score (ours) | 28 / 100 |
| Legacy data-support index | 0.67/1 |
| Coordinates | 41.7233, -102.9783 |
| Nearest City | Cheyenne (167 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-06T00:41:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.aed7ee931e1f2d691ec37aae6e7bd80f52415f4d.001.1 |
Physical priority index · v4 (historical). 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: 2026-09-06T00:41:00.000Z.
First archived: 2026-09-06T00:48:10.764Z. 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 | Morrill, NE |
| Headline | Flash Flood Warning issued September 5 at 6:41PM MDT until September 5 at 9:45PM MDT by NWS Cheyenne WY |
| Expires | 2026-09-05T21:45:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.aed7ee931e1f2d691ec37aae6e7bd80f52415f4d.001.1","noaa_urn:oid:2.49.0.1.840.0.3f08049b75ef6d10cdaeb006224fdf77186355f8.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 100 |
| Spc Location | 3 W Broadwater |
| Spc County | Morrill |
| Spc State | NE |
| Spc Comments | Trained Spotter reporting 1 inch hail with torential rainfall. (CYS) |
| MergedSources | [{"id":"spc_wind_41.63_-102.98_280","source":"spc","severity":"medium","severityValue":45,"timestamp":1788653880000,"latitude":41.63,"longitude":-102.98},{"id":"spc_wind_41.67_-102.97_281","source":"spc","severity":"medium","severityValue":45,"timestamp":1788654180000,"latitude":41.67,"longitude":-102.97},{"id":"spc_wind_41.63_-102.98_282","source":"spc","severity":"medium","severityValue":45,"timestamp":1788654240000,"latitude":41.63,"longitude":-102.98},{"id":"spc_wind_41.66_-102.65_283","source":"spc","severity":"medium","severityValue":45,"timestamp":1788654780000,"latitude":41.66,"longitude":-102.65},{"id":"spc_wind_41.60_-102.91_285","source":"spc","severity":"medium","severityValue":45,"timestamp":1788655740000,"latitude":41.6,"longitude":-102.91},{"id":"spc_wind_41.76_-102.44_286","source":"spc","severity":"medium","severityValue":45,"timestamp":1788657000000,"latitude":41.76,"longitude":-102.44},{"id":"spc_wind_42.06_-102.80_287","source":"spc","severity":"medium","severityValue":45,"timestamp":1788657840000,"latitude":42.06,"longitude":-102.8},{"id":"spc_hail_42.10_-102.99_302","source":"spc","severity":"high","severityValue":65,"timestamp":1788664760637,"latitude":42.1,"longitude":-102.99},{"id":"spc_hail_42.10_-102.97_304","source":"spc","severity":"high","severityValue":65,"timestamp":1788664760637,"latitude":42.1,"longitude":-102.97},{"id":"spc_hail_42.13_-102.96_305","source":"spc","severity":"high","severityValue":65,"timestamp":1788664760637,"latitude":42.13,"longitude":-102.96},{"id":"spc_hail_42.05_-102.90_306","source":"spc","severity":"high","severityValue":65,"timestamp":1788664760637,"latitude":42.05,"longitude":-102.9},{"id":"spc_hail_42.05_-102.91_307","source":"spc","severity":"high","severityValue":65,"timestamp":1788664760637,"latitude":42.05,"longitude":-102.91},{"id":"spc_hail_42.06_-102.90_309","source":"spc","severity":"high","severityValue":65,"timestamp":1788664760637,"latitude":42.06,"longitude":-102.9},{"id":"spc_hail_41.98_-102.94_310","source":"spc","severity":"high","severityValue":65,"timestamp":1788664760637,"latitude":41.98,"longitude":-102.94},{"id":"spc_hail_41.71_-103.10_311","source":"spc","severity":"high","severityValue":65,"timestamp":1788664760637,"latitude":41.71,"longitude":-103.1},{"id":"spc_hail_41.82_-103.48_313","source":"spc","severity":"high","severityValue":65,"timestamp":1788652860000,"latitude":41.82,"longitude":-103.48},{"id":"spc_hail_41.81_-103.43_315","source":"spc","severity":"high","severityValue":65,"timestamp":1788653280000,"latitude":41.81,"longitude":-103.43},{"id":"spc_hail_41.60_-102.91_318","source":"spc","severity":"high","severityValue":65,"timestamp":1788655740000,"latitude":41.6,"longitude":-102.91}] |
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.
Review the area, threshold and delivery channel in your account.
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