Right now
The most recent data we hold from NOAA arrived 19 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 01:30 UTC. It is kept here as a record.
It is the 40th strongest of the 96 detections recorded within 20 km of this point since 5 May 2026. The last comparable one was on 21 June 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 26 at 6:57PM MDT until June 26 at 7:30PM MDT by NWS Cheyenne WY
Nearby, since 5 May 2026
- June 27, 2026 · score 22 · 9.5 km
- September 6, 2026 · score 28 · 12.2 km
- July 28, 2026 · score 22 · 14.2 km
How we know
3 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 | 41.6467, -102.9800 |
| Nearest City | Cheyenne (163 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-27T00:57:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.276efb51056d4d13c518f5b7f90ec58636f1604b.001.1 |
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: 2026-06-27T00:57:00.000Z.
First archived: 2026-06-27T01:26:24.954Z. 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 | Morrill, NE |
| Headline | Severe Thunderstorm Warning issued June 26 at 6:57PM MDT until June 26 at 7:30PM MDT by NWS Cheyenne WY |
| Expires | 2026-06-26T19:30:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 60 |
| Iem Unit | MPH |
| Iem City | 3 SSW Alliance |
| Iem County | Box Butte |
| Iem State | NE |
| Iem Wfo | CYS |
| Iem Remark | Nebraska Mesonet site gusted to 60 mph. |
| MergedSources | [{"id":"iem_G_42.060_-102.890_1782522000000","source":"iem","severity":"low","severityValue":25,"timestamp":1782522000000,"latitude":42.06,"longitude":-102.89},{"id":"iem_G_42.060_-102.890_1782518400000","source":"iem","severity":"low","severityValue":25,"timestamp":1782518400000,"latitude":42.06,"longitude":-102.89}] |
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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