This alert expired on 2 July 2026 at 23:30 UTC. It is kept here as a record.
It is the 7th strongest of the 73 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 2 at 6:18PM CDT until July 2 at 6:30PM CDT by NWS Des Moines IA
An estimated 531,549 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 21, 2026 · score 41 · 2.8 km
- August 13, 2026 · score 48 · 6.1 km
- July 3, 2026 · score 41 · 6.8 km
How we know
Confirmed by 9 independent sources, including NOAA.
Our own score for this event is 48 out of 100, at 87 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 48 / 100 |
| Our confidence | 87% |
| Coordinates | 41.9283, -93.5667 |
| Nearest City | Ames (12 km) |
| Population Exposed | 531.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-02T23:18:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.4b0d89829546d602e7b241acde8f53f000d5af9d.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Boone, IA; Story, IA |
| Headline | Severe Thunderstorm Warning issued July 2 at 6:18PM CDT until July 2 at 6:30PM CDT by NWS Des Moines IA |
| Expires | 2026-07-02T18:30:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1.5 |
| Iem Unit | Inch |
| Iem City | 3 NE Windsor Heights |
| Iem County | Polk |
| Iem State | IA |
| Iem Wfo | DMX |
| MergedSources | [{"id":"iem_H_42.280_-94.290_1783026060000","source":"iem","severity":"low","severityValue":25,"timestamp":1783026060000,"latitude":42.28,"longitude":-94.29},{"id":"iem_H_41.820_-93.780_1783031100000","source":"iem","severity":"low","severityValue":25,"timestamp":1783031100000,"latitude":41.82,"longitude":-93.78},{"id":"iem_H_41.610_-93.690_1783027560000","source":"iem","severity":"low","severityValue":25,"timestamp":1783027560000,"latitude":41.61,"longitude":-93.69},{"id":"iem_H_41.630_-93.700_1783028100000","source":"iem","severity":"low","severityValue":25,"timestamp":1783028100000,"latitude":41.63,"longitude":-93.7},{"id":"iem_H_41.640_-93.700_1783028220000","source":"iem","severity":"low","severityValue":25,"timestamp":1783028220000,"latitude":41.64,"longitude":-93.7},{"id":"iem_H_42.280_-94.300_1783025760000","source":"iem","severity":"low","severityValue":25,"timestamp":1783025760000,"latitude":42.28,"longitude":-94.3},{"id":"iem_D_41.590_-93.690_1783028280000","source":"iem","severity":"low","severityValue":25,"timestamp":1783028280000,"latitude":41.59,"longitude":-93.69},{"id":"iem_H_41.640_-93.660_1783028400000","source":"iem","severity":"low","severityValue":25,"timestamp":1783028400000,"latitude":41.64,"longitude":-93.66}] |
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 near Ames?
Calamity.live data shows a weather event with CalamityScore 48/100, near Ames (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.