Right now
The most recent data we hold from NOAA arrived 4 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 13 May 2026 at 23:46 UTC. It is kept here as a record.
No stronger detection stands among the 34 recorded within 20 km of this point since 11 April 2026 — 7 others scored the same. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 13 at 5:37PM MDT until May 13 at 5:45PM MDT by NWS Riverton WY
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 66 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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 |
| Our confidence | 66% |
| Coordinates | 42.8480, -108.6560 |
| Nearest City | Rock Springs (147 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-13T23:37:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.3769d487e4e40483c4ef0f5e1dc7857daf82f206.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Fremont, WY |
| Headline | Severe Thunderstorm Warning issued May 13 at 5:37PM MDT until May 13 at 5:45PM MDT by NWS Riverton WY |
| Expires | 2026-05-13T17:46:00-06:00 |
| SenderName | NWS Riverton WY |
| HasExactCoords | true |
| Iem TypeSummary | N |
| Iem Magnitude | 66 |
| Iem Unit | MPH |
| Iem City | 15 SW South Pass City |
| Iem County | Fremont |
| Iem State | WY |
| Iem Wfo | RIW |
| Iem Remark | Mesonet station PC283 Dickinson (PC). |
| MergedSources | [{"id":"iem_N_42.350_-109.030_1778712600000","source":"iem","severity":"low","severityValue":25,"timestamp":1778712600000,"latitude":42.35,"longitude":-109.03}] |
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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