Right now
The most recent data we hold from NOAA arrived 2 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 21 June 2026 at 00:45 UTC. It is kept here as a record.
It is the 5th strongest of the 18 detections recorded within 20 km of this point since 5 May 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 20 at 6:28PM MDT until June 20 at 6:45PM MDT by NWS Cheyenne WY
Nearby, since 5 May 2026
- September 7, 2026 · score 16 · 13.0 km
- June 2, 2026 · score 46 · 21.0 km
- August 29, 2026 · score 28 · 22.2 km
How we know
Confirmed by 8 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 69 % 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 | 69% |
| Coordinates | 42.6596, -104.7796 |
| Nearest City | Casper (127 km) |
| Impact Tier | minor |
| Timestamp | 2026-06-21T00:28:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.becea6df7eff4ec22288e4317d3a81b9 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Goshen, WY; Platte, WY; Albany, WY; Carbon, WY; Carbon, WY and 4 more areas |
| Headline | Severe Thunderstorm Warning issued June 20 at 6:28PM MDT until June 20 at 6:45PM MDT by NWS Cheyenne WY |
| Expires | 2026-06-20T18:45:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.becea6df7eff4ec22288e4317d3a81b9718e44dc.001.1","noaa_urn:oid:2.49.0.1.840.0.6fbde181f0dd04590b1adec430a2b174d21c4fd6.001.1","noaa_urn:oid:2.49.0.1.840.0.744f041f28002e29b77cd03ef7399f34d899d2c6.001.1","noaa_urn:oid:2.49.0.1.840.0.1f28f53e163f1c1a1434b4c63210ac3f5209895f.001.1","noaa_urn:oid:2.49.0.1.840.0.07524cbafc892556271d3376ad79169b1902e987.001.1","noaa_urn:oid:2.49.0.1.840.0.d6a2f278b57a1d4583810fcf6ceab73d6119baf1.001.1","noaa_urn:oid:2.49.0.1.840.0.7ee2e429734988965f1a32de835bd1ba41b312a2.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 67 |
| Iem Unit | MPH |
| Iem City | 8 NNW Glendo |
| Iem County | Platte |
| Iem State | WY |
| Iem Wfo | CYS |
| Iem Remark | Mesonet station WY56 I25 Us26 Us87 - Platte Converse. |
| MergedSources | [{"id":"iem_G_42.800_-105.380_1781996340000","source":"iem","severity":"low","severityValue":25,"timestamp":1781996340000,"latitude":42.8,"longitude":-105.38},{"id":"iem_G_43.000_-105.310_1781997000000","source":"iem","severity":"low","severityValue":25,"timestamp":1781997000000,"latitude":43,"longitude":-105.31},{"id":"iem_G_42.720_-105.490_1781995140000","source":"iem","severity":"low","severityValue":25,"timestamp":1781995140000,"latitude":42.72,"longitude":-105.49},{"id":"iem_G_42.720_-105.490_1781995680000","source":"iem","severity":"low","severityValue":25,"timestamp":1781995680000,"latitude":42.72,"longitude":-105.49},{"id":"iem_G_42.720_-105.490_1781995080000","source":"iem","severity":"low","severityValue":25,"timestamp":1781995080000,"latitude":42.72,"longitude":-105.49},{"id":"iem_G_42.600_-105.100_1781996760000","source":"iem","severity":"low","severityValue":25,"timestamp":1781996760000,"latitude":42.6,"longitude":-105.1},{"id":"iem_G_42.600_-105.100_1781997360000","source":"iem","severity":"low","severityValue":25,"timestamp":1781997360000,"latitude":42.6,"longitude":-105.1}] |
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.
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