Right now
The most recent data we hold from NOAA arrived 35 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 04:15 UTC. It is kept here as a record.
No stronger detection stands among the 37 recorded within 20 km of this point since 23 April 2026 — 7 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 5 at 9:40PM MDT until September 5 at 10:15PM MDT by NWS Cheyenne WY
Nearby, since 23 April 2026
- July 2, 2026 · 18.4 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 | 41.1080, -103.1700 |
| Nearest City | Cheyenne (138 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-06T03:40:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.3956ba214354a48416515b6b43ce668e42664d7f.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: 2026-09-06T03:40:00.000Z.
First archived: 2026-09-06T03:47:46.580Z. 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 | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Cheyenne, NE |
| Headline | Severe Thunderstorm Warning issued September 5 at 9:40PM MDT until September 5 at 10:15PM MDT by NWS Cheyenne WY |
| Expires | 2026-09-05T22:15:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| 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_283","source":"spc","severity":"medium","severityValue":45,"timestamp":1788653880000,"latitude":41.63,"longitude":-102.98},{"id":"spc_wind_41.67_-102.97_284","source":"spc","severity":"medium","severityValue":45,"timestamp":1788654180000,"latitude":41.67,"longitude":-102.97},{"id":"spc_wind_41.63_-102.98_285","source":"spc","severity":"medium","severityValue":45,"timestamp":1788654240000,"latitude":41.63,"longitude":-102.98},{"id":"spc_wind_41.60_-102.91_288","source":"spc","severity":"medium","severityValue":45,"timestamp":1788655740000,"latitude":41.6,"longitude":-102.91},{"id":"spc_wind_41.05_-103.13_293","source":"spc","severity":"medium","severityValue":45,"timestamp":1788664920000,"latitude":41.05,"longitude":-103.13},{"id":"spc_hail_40.62_-103.21_313","source":"spc","severity":"high","severityValue":65,"timestamp":1788666593163,"latitude":40.62,"longitude":-103.21},{"id":"spc_hail_41.71_-103.10_316","source":"spc","severity":"high","severityValue":65,"timestamp":1788666593163,"latitude":41.71,"longitude":-103.1},{"id":"spc_hail_41.09_-102.47_319","source":"spc","severity":"high","severityValue":65,"timestamp":1788653160000,"latitude":41.09,"longitude":-102.47},{"id":"spc_hail_41.60_-102.91_323","source":"spc","severity":"high","severityValue":65,"timestamp":1788655740000,"latitude":41.6,"longitude":-102.91}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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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