Reported by SPC 175 days ago.
It is the 3rd strongest of the 161 detections recorded within 20 km of this point since 11 March 2026.
What the source measured
SPC reported: Hail 100 in near Iowa City, Johnson, IA. 10 minutes of quarter size hail. Hail is covering the ground. (DVN)
An estimated 302,462 people live within 50 km of this point.
Nearby, since 11 March 2026
- July 7, 2026 · score 43 · 9.5 km
- August 12, 2026 · score 43 · 10.4 km
- June 18, 2026 · score 37 · 12.0 km
How we know
One source: SPC. Not yet confirmed by a second, independent source.
Our own score for this event is 49 out of 100, at 68 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | high |
| Calamity Score (ours) | 49 / 100 |
| Our confidence | 68% |
| Coordinates | 41.6600, -91.5300 |
| Nearest City | Iowa City (0 km) |
| Population Exposed | 302.5K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-03-11T00:20:00.000Z |
| Source | https://www.spc.noaa.gov/climo/reports/today.html |
Score Breakdown
Technical Details
| ReportType | hail |
| Speed | 100 |
| Location | Iowa City |
| County | Johnson |
| State | IA |
| Comments | 10 minutes of quarter size hail. Hail is covering the ground. (DVN) |
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 near Iowa City?
Calamity.live data shows a weather event with CalamityScore 49/100, near Iowa City (United States), based on data from spc. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.