Right now
The most recent data we hold from NOAA arrived 6 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 28 June 2026 at 00:30 UTC. It is kept here as a record.
No stronger detection stands among the 6 recorded within 20 km of this point since 22 June 2026 — 4 others scored the same. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 27 at 5:48PM MDT until June 27 at 6:30PM MDT by NWS Riverton WY
How we know
4 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 | 44.2971, -106.1914 |
| Nearest City | Gillette (55 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-27T23:48:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.48e2ce6e5037feb410fa81da8f6a5da041503838.001.1 |
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: 2026-06-27T23:48:00.000Z.
First archived: 2026-06-27T23:54:05.555Z. 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 | Johnson, WY |
| Headline | Severe Thunderstorm Warning issued June 27 at 5:48PM MDT until June 27 at 6:30PM MDT by NWS Riverton WY |
| Expires | 2026-06-27T18:30:00-06:00 |
| SenderName | NWS Riverton WY |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 58 |
| Iem Unit | MPH |
| Iem City | 15 NNE Mayoworth |
| Iem County | Johnson |
| Iem State | WY |
| Iem Wfo | RIW |
| Iem Remark | Mesonet station PC578 Purdy East (PC). Time estimate from radar. |
| MergedSources | [{"id":"iem_H_44.720_-106.720_1782586800000","source":"iem","severity":"low","severityValue":25,"timestamp":1782586800000,"latitude":44.72,"longitude":-106.72},{"id":"iem_H_44.600_-106.360_1782590400000","source":"iem","severity":"low","severityValue":25,"timestamp":1782590400000,"latitude":44.6,"longitude":-106.36},{"id":"iem_G_44.020_-106.640_1782601680000","source":"iem","severity":"low","severityValue":25,"timestamp":1782601680000,"latitude":44.02,"longitude":-106.64}] |
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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