Right now
The most recent data we hold from NOAA arrived 9 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 20:30 UTC. It is kept here as a record.
No stronger detection stands among the 23 recorded within 20 km of this point since 21 March 2026 — 6 others scored the same. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 27 at 1:34PM MDT until June 27 at 2:30PM MDT by NWS Billings MT
Urban PEI: 17,873 within a heuristic 50 km radius; not unique people.
Nearby, since 21 March 2026
- July 19, 2026 · score 34 · 9.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
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 | 0.78/1 |
| Coordinates | 44.7282, -106.6394 |
| Nearest City | Sheridan (27 km) |
| Urban exposure index (PEI) | 17.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-27T19:34:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.28c5f75b72d8f0ac865f450e10797524 |
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: 2026-06-27T19:34:00.000Z.
First archived: 2026-06-27T19:41:50.488Z. 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 | Sheridan, WY; Big Horn, MT; Powder River, MT; Rosebud, MT; Sheridan, WY; Johnson, WY |
| Headline | Severe Thunderstorm Warning issued June 27 at 1:34PM MDT until June 27 at 2:30PM MDT by NWS Billings MT |
| Expires | 2026-06-27T14:30:00-06:00 |
| SenderName | NWS Billings MT |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.28c5f75b72d8f0ac865f450e107975249c7b65ff.001.1","noaa_urn:oid:2.49.0.1.840.0.a44eb6abd24f42fd921ea56358b034905a24389e.001.1","noaa_urn:oid:2.49.0.1.840.0.220f92d12c5bdc32ba34e4a41810c0d19b0379e0.001.1"] |
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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