Right now
The most recent data we hold from NOAA arrived 8 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
4 other detections within 20 km in the last 24 hours, the nearest 5 km from here.
This alert expired on 19 September 2026 at 02:45 UTC. It is kept here as a record.
It is the 9th strongest of the 21 detections recorded within 20 km of this point since 5 May 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 18 at 8:18PM MDT until September 18 at 8:45PM MDT by NWS Cheyenne WY
Nearby, since 5 May 2026
- September 19, 2026 · score 16 · 14.2 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 16 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 v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 16 / 100 |
| Legacy data-support index | 0.66/1 |
| Coordinates | 42.3200, -103.8000 |
| Nearest City | Cheyenne (156 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-19T02:18:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.a6cec8a47a6c55e449211aa2f192d0c067fb4aed.002.1 |
Physical priority index · v5. 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: 2026-09-19T02:18:00.000Z.
First archived: 2026-09-19T02:23:49.777Z. 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 | Banner, NE; Scotts Bluff, NE; Sioux, NE; Sioux, NE |
| Headline | Severe Thunderstorm Warning issued September 18 at 8:18PM MDT until September 18 at 8:45PM MDT by NWS Cheyenne WY |
| Expires | 2026-09-18T20:45:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a6cec8a47a6c55e449211aa2f192d0c067fb4aed.002.1","noaa_urn:oid:2.49.0.1.840.0.489e93f45dc3bbd209cae51372c3e8d3da3e6ac0.001.1"] |
| Spc ReportType | wind |
| Spc Speed | 62 |
| Spc Location | 2 SW Harrison |
| Spc County | Sioux |
| Spc State | NE |
| Spc Comments | Personal weather station. (CYS) |
| MergedSources | [{"id":"spc_wind_42.07_-104.15_76","source":"spc","severity":"medium","severityValue":45,"timestamp":1789782420000,"latitude":42.07,"longitude":-104.15},{"id":"spc_wind_42.67_-103.91_77","source":"spc","severity":"medium","severityValue":45,"timestamp":1789783140000,"latitude":42.67,"longitude":-103.91}] |
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.
Review the area, threshold and delivery channel in your account.
Want to know when something happens in this area?