This alert expired on 3 July 2026 at 19:45 UTC. It is kept here as a record.
No stronger detection stands among the 161 recorded within 20 km of this point since 15 March 2026 — 24 others scored the same. Another comparable one was recorded here earlier the same day. 19 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 3 at 12:58PM MDT until July 3 at 1:45PM MDT by NWS Rapid City SD
An estimated 73,569 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 30, 2026 · score 39 · 13.7 km
- June 2, 2026 · score 39 · 14.0 km
- July 8, 2026 · score 39 · 15.1 km
How we know
Confirmed by 7 independent sources, including NOAA.
Our own score for this event is 39 out of 100, at 89 % 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 | 89% |
| Coordinates | 44.0720, -103.5480 |
| Nearest City | Rapid City (25 km) |
| Population Exposed | 73.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-03T18:58:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Pennington, SD |
| Headline | Severe Thunderstorm Warning issued July 3 at 12:58PM MDT until July 3 at 1:45PM MDT by NWS Rapid City SD |
| Expires | 2026-07-03T13:45:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | inch |
| Iem City | Dwtn Spearfish |
| Iem County | Lawrence |
| Iem State | SD |
| Iem Wfo | UNR |
| Iem Remark | Reported on the northwest side of Spearfish |
| MergedSources | [{"id":"iem_R_44.240_-103.250_1783083600000","source":"iem","severity":"low","severityValue":25,"timestamp":1783083600000,"latitude":44.24,"longitude":-103.25},{"id":"iem_H_44.510_-103.860_1783098600000","source":"iem","severity":"low","severityValue":25,"timestamp":1783098600000,"latitude":44.51,"longitude":-103.86},{"id":"iem_H_44.510_-103.890_1783098180000","source":"iem","severity":"low","severityValue":25,"timestamp":1783098180000,"latitude":44.51,"longitude":-103.89},{"id":"iem_H_44.490_-103.860_1783098780000","source":"iem","severity":"low","severityValue":25,"timestamp":1783098780000,"latitude":44.49,"longitude":-103.86},{"id":"iem_R_44.290_-103.150_1783083600000","source":"iem","severity":"low","severityValue":25,"timestamp":1783083600000,"latitude":44.29,"longitude":-103.15},{"id":"iem_H_44.500_-103.860_1783098360000","source":"iem","severity":"low","severityValue":25,"timestamp":1783098360000,"latitude":44.5,"longitude":-103.86}] |
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.