Reported by SPC today.
It is the 20th strongest of the 61 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
SPC reported: Wind 71 kt near 5 SSE Rock Rapids, Lyon, IA. Personal weather station. (FSD)
Nearby, since 15 March 2026
- June 28, 2026 · score 43 · 18.9 km
- September 2, 2026 · score 46 · 19.6 km
How we know
Confirmed by 2 independent sources, including SPC.
Our own score for this event is 16 out of 100, at 60 % 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) | 16 / 100 |
| Our confidence | 60% |
| Coordinates | 43.3700, -96.1300 |
| Nearest City | Sioux Falls (52 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-02T03:37:00.000Z |
| Source | https://www.spc.noaa.gov/climo/reports/today.html |
Score Breakdown
Technical Details
| ReportType | wind |
| Speed | 71 |
| Location | 5 SSE Rock Rapids |
| County | Lyon |
| State | IA |
| Comments | Personal weather station. (FSD) |
| Iem TypeSummary | G |
| Iem Magnitude | 71 |
| Iem Unit | MPH |
| Iem City | 5 SSE Rock Rapids |
| Iem County | Lyon |
| Iem State | IA |
| Iem Wfo | FSD |
| Iem Remark | Personal weather station. |
| MergedSources | [{"id":"iem_G_43.370_-96.130_1788320220000","source":"iem","severity":"low","severityValue":25,"timestamp":1788320220000,"latitude":43.37,"longitude":-96.13}] |
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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 16/100 (United States), based on data from spc. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.