This alert expired on 19 June 2026 at 04:22 UTC. It is kept here as a record.
No stronger detection stands among the 20 recorded within 20 km of this point since 3 April 2026 — 11 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 18 at 10:12PM MDT until June 18 at 10:15PM MDT by NWS Aberdeen SD
How we know
Confirmed by 7 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 70 % 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 | 70% |
| Coordinates | 45.0583, -101.2658 |
| Nearest City | Rapid City (190 km) |
| Impact Tier | minor |
| Timestamp | 2026-06-19T04:12:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Dewey, SD; Stanley, SD |
| Headline | Severe Thunderstorm Warning issued June 18 at 10:12PM MDT until June 18 at 10:15PM MDT by NWS Aberdeen SD |
| Expires | 2026-06-18T22:22:00-06:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 50 |
| Iem Unit | mph |
| Iem City | 1 WSW Red Elm |
| Iem County | Ziebach |
| Iem State | SD |
| Iem Wfo | UNR |
| MergedSources | [{"id":"iem_G_45.210_-102.160_1781836740000","source":"iem","severity":"low","severityValue":25,"timestamp":1781836740000,"latitude":45.21,"longitude":-102.16},{"id":"iem_G_45.050_-101.800_1781837640000","source":"iem","severity":"low","severityValue":25,"timestamp":1781837640000,"latitude":45.05,"longitude":-101.8},{"id":"iem_G_45.210_-102.160_1781836140000","source":"iem","severity":"low","severityValue":25,"timestamp":1781836140000,"latitude":45.21,"longitude":-102.16},{"id":"iem_G_45.050_-101.800_1781837940000","source":"iem","severity":"low","severityValue":25,"timestamp":1781837940000,"latitude":45.05,"longitude":-101.8},{"id":"iem_G_45.040_-102.020_1781836920000","source":"iem","severity":"low","severityValue":25,"timestamp":1781836920000,"latitude":45.04,"longitude":-102.02},{"id":"iem_G_45.050_-101.800_1781838540000","source":"iem","severity":"low","severityValue":25,"timestamp":1781838540000,"latitude":45.05,"longitude":-101.8}] |
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 Rapid City (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.