Reported by SPC today.
No stronger detection stands among the 93 recorded within 20 km of this point since 16 March 2026 — 70 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
SPC reported: Hail 150 in near Monona, Clayton, IA. Picture of a large hailstone shared via NWSChat. (ARX)
Nearby, since 16 March 2026
- September 5, 2026 · score 28 · 0.0 km
- September 4, 2026 · score 28 · 0.0 km
- July 5, 2026 · score 22 · 7.5 km
How we know
One source: SPC. Not yet confirmed by a second, independent source.
Our own score for this event is 28 out of 100, at 41 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | High |
| Calamity Score (ours) | 28 / 100 |
| Our confidence | 41% |
| Coordinates | 43.0500, -91.3900 |
| Nearest City | La Crosse (84 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-05T10:24:52.897Z |
| Source | https://www.spc.noaa.gov/climo/reports/today.html |
Score Breakdown
Technical Details
| ReportType | hail |
| Speed | 150 |
| Location | Monona |
| County | Clayton |
| State | IA |
| Comments | Picture of a large hailstone shared via NWSChat. (ARX) |
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 8 March 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 28/100 (United States), based on data from spc. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.