Right now
The most recent data we hold from NOAA arrived 15 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 22 June 2026 at 23:45 UTC. It is kept here as a record.
No stronger detection stands among the 24 recorded within 20 km of this point since 22 April 2026 — 16 others scored the same. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 22 at 5:11PM MDT until June 22 at 5:45PM MDT by NWS Billings MT
Urban PEI: 17,873 within a heuristic 50 km radius; not unique people.
Nearby, since 22 April 2026
- June 26, 2026 · score 34 · 2.3 km
- July 4, 2026 · score 34 · 19.3 km
- July 8, 2026 · score 34 · 19.5 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 34 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) | 34 / 100 |
| Legacy data-support index | 0.82/1 |
| Coordinates | 45.0380, -106.9360 |
| Nearest City | Sheridan (27 km) |
| Urban exposure index (PEI) | 17.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-22T23:11:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.9dfb6a6dfbc7fbfaad104f9a03b9b7b41ee07152.001.1 |
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: 2026-06-22T23:11:00.000Z.
First archived: 2026-06-22T23:37:50.504Z. 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 | Big Horn, MT; Sheridan, WY |
| Headline | Severe Thunderstorm Warning issued June 22 at 5:11PM MDT until June 22 at 5:45PM MDT by NWS Billings MT |
| Expires | 2026-06-22T17:45:00-06:00 |
| SenderName | NWS Billings MT |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 71 |
| Iem Unit | MPH |
| Iem City | 7 W Lodge Grass |
| Iem County | Big Horn |
| Iem State | MT |
| Iem Wfo | BYZ |
| MergedSources | [{"id":"iem_G_45.310_-107.520_1782167400000","source":"iem","severity":"low","severityValue":25,"timestamp":1782167400000,"latitude":45.31,"longitude":-107.52}] |
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.
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