Right now
The most recent data we hold from NOAA arrived 2 hours ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 20 July 2026 at 22:15 UTC. It is kept here as a record.
It is the 3rd strongest of the 40 detections recorded within 20 km of this point since 3 April 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued July 20 at 5:05PM CDT until July 20 at 5:15PM CDT by NWS Des Moines IA
Urban PEI: 65,060 within a heuristic 50 km radius; not unique people.
Nearby, since 3 April 2026
- May 18, 2026 · score 39 · 15.8 km
- July 20, 2026 · score 67 · 20.3 km
- September 4, 2026 · score 32 · 21.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 63 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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 | Critical |
| Calamity Score (ours) | 63 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 42.2510, -93.5870 |
| Nearest City | Ames (25 km) |
| Urban exposure index (PEI) | 65.1K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-07-20T22:05:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.465db397b0d469696efa0fa18c9bcc9b |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-07-20T22:05:00.000Z.
First archived: 2026-07-20T22:12:44.298Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Hamilton, IA; Hamilton, IA; Hardin, IA; Story, IA |
| Headline | Tornado Warning issued July 20 at 5:05PM CDT until July 20 at 5:15PM CDT by NWS Des Moines IA |
| Expires | 2026-07-20T17:15:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.465db397b0d469696efa0fa18c9bcc9b87420fa7.002.1","noaa_urn:oid:2.49.0.1.840.0.5c78bb87fd3331c4fbb7cb3fc00de605d6b37e6a.001.1"] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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.
Review the area, threshold and delivery channel in your account.
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