This alert expired on 27 June 2026 at 03:00 UTC. It is kept here as a record.
No stronger detection stands among the 75 recorded within 20 km of this point since 15 March 2026 — 27 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 26 at 8:47PM MDT until June 26 at 9:00PM MDT by NWS Rapid City SD
An estimated 73,569 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 25, 2026 · score 39 · 10.5 km
- June 3, 2026 · score 39 · 15.1 km
- July 29, 2026 · score 39 · 17.8 km
How we know
Confirmed by 16 independent sources, including NOAA.
Our own score for this event is 39 out of 100, at 88 % 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) | 39 / 100 |
| Our confidence | 88% |
| Coordinates | 44.3567, -102.9111 |
| Nearest City | Rapid City (40 km) |
| Population Exposed | 73.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-27T02:47:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Meade, SD; Pennington, SD |
| Headline | Severe Thunderstorm Warning issued June 26 at 8:47PM MDT until June 26 at 9:00PM MDT by NWS Rapid City SD |
| Expires | 2026-06-26T21:00:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 51 |
| Iem Unit | mph |
| Iem City | 2 ENE Rockerville |
| Iem County | Pennington |
| Iem State | SD |
| Iem Wfo | UNR |
| MergedSources | [{"id":"iem_G_44.000_-103.000_1782527100000","source":"iem","severity":"low","severityValue":25,"timestamp":1782527100000,"latitude":44,"longitude":-103},{"id":"iem_G_44.680_-103.560_1782524100000","source":"iem","severity":"low","severityValue":25,"timestamp":1782524100000,"latitude":44.68,"longitude":-103.56},{"id":"iem_G_44.230_-103.040_1782527100000","source":"iem","severity":"low","severityValue":25,"timestamp":1782527100000,"latitude":44.23,"longitude":-103.04},{"id":"iem_G_44.240_-103.250_1782526680000","source":"iem","severity":"low","severityValue":25,"timestamp":1782526680000,"latitude":44.24,"longitude":-103.25},{"id":"iem_G_44.020_-103.240_1782526200000","source":"iem","severity":"low","severityValue":25,"timestamp":1782526200000,"latitude":44.02,"longitude":-103.24},{"id":"iem_G_44.070_-103.210_1782526200000","source":"iem","severity":"low","severityValue":25,"timestamp":1782526200000,"latitude":44.07,"longitude":-103.21},{"id":"iem_G_44.050_-103.060_1782526740000","source":"iem","severity":"low","severityValue":25,"timestamp":1782526740000,"latitude":44.05,"longitude":-103.06},{"id":"iem_G_43.970_-103.330_1782525600000","source":"iem","severity":"low","severityValue":25,"timestamp":1782525600000,"latitude":43.97,"longitude":-103.33},{"id":"iem_G_44.120_-103.090_1782526800000","source":"iem","severity":"low","severityValue":25,"timestamp":1782526800000,"latitude":44.12,"longitude":-103.09},{"id":"iem_G_44.150_-103.100_1782526680000","source":"iem","severity":"low","severityValue":25,"timestamp":1782526680000,"latitude":44.15,"longitude":-103.1},{"id":"iem_G_44.480_-103.780_1782522900000","source":"iem","severity":"low","severityValue":25,"timestamp":1782522900000,"latitude":44.48,"longitude":-103.78},{"id":"iem_G_44.420_-103.380_1782524100000","source":"iem","severity":"low","severityValue":25,"timestamp":1782524100000,"latitude":44.42,"longitude":-103.38},{"id":"iem_H_44.050_-103.490_1782525300000","source":"iem","severity":"low","severityValue":25,"timestamp":1782525300000,"latitude":44.05,"longitude":-103.49},{"id":"iem_G_44.000_-103.000_1782526800000","source":"iem","severity":"low","severityValue":25,"timestamp":1782526800000,"latitude":44,"longitude":-103},{"id":"iem_G_43.970_-103.330_1782526200000","source":"iem","severity":"low","severityValue":25,"timestamp":1782526200000,"latitude":43.97,"longitude":-103.33}] |
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 39/100, near Rapid City (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.