This alert expired on 9 August 2026 at 23:50 UTC. It is kept here as a record.
It is the 4th strongest of the 68 detections recorded within 20 km of this point since 5 May 2026. 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 August 9 at 5:40PM MDT until August 9 at 5:45PM MDT by NWS Cheyenne 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.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 66% |
| Coordinates | 42.0381, -103.6504 |
| Nearest City | Cheyenne (139 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-09T23:40:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Scotts Bluff, NE; Sioux, NE; Goshen, WY; Banner, NE; Morrill, NE; Scotts Bluff, NE; Box Butte, NE; Dawes, NE; Sioux, NE |
| Headline | Severe Thunderstorm Warning issued August 9 at 5:40PM MDT until August 9 at 5:45PM MDT by NWS Cheyenne WY |
| Expires | 2026-08-09T17:50:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.327583bcf38bbc30b3ba3c92b578966e133a124a.001.1","noaa_urn:oid:2.49.0.1.840.0.6836aad5098373ca0c9c79b93b70e3a41518e58b.001.1","noaa_urn:oid:2.49.0.1.840.0.ba924502bfcaf8ed193dcdb2251d3a4f776e2345.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 53 |
| Iem Unit | MPH |
| Iem City | 2 E Torrington |
| Iem County | Goshen |
| Iem State | WY |
| Iem Wfo | CYS |
| Iem Remark | ASOS station KTOR Torrington Airport - Tor. |
| MergedSources | [{"id":"iem_G_42.070_-104.150_1786315500000","source":"iem","severity":"low","severityValue":25,"timestamp":1786315500000,"latitude":42.07,"longitude":-104.15}] |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 22/100, near Cheyenne (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.