Right now
The most recent data we hold from NOAA arrived 5 minutes 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 17 June 2026 at 10:15 UTC. It is kept here as a record.
No stronger detection stands among the 23 recorded within 20 km of this point since 23 April 2026 — 14 others scored the same. 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: Severe Thunderstorm Warning issued June 17 at 4:31AM CDT until June 17 at 5:15AM CDT by NWS Des Moines IA
Urban PEI: 24,649 within a heuristic 50 km radius; not unique people.
Nearby, since 23 April 2026
- July 2, 2026 · score 34 · 23.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 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 | Medium |
| Calamity Score (ours) | 34 / 100 |
| Legacy data-support index | 0.81/1 |
| Coordinates | 42.4869, -94.5669 |
| Nearest City | Fort Dodge (33 km) |
| Urban exposure index (PEI) | 24.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-17T09:31:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.e6182c0608da9361f1ace090a0e367fe |
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: 2026-06-17T09:31:00.000Z.
First archived: 2026-06-17T09:37:12.874Z. 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 | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Boone, IA; Calhoun, IA; Greene, IA; Hamilton, IA; Webster, IA; Calhoun, IA; Pocahontas, IA; Sac, IA |
| Headline | Severe Thunderstorm Warning issued June 17 at 4:31AM CDT until June 17 at 5:15AM CDT by NWS Des Moines IA |
| Expires | 2026-06-17T05:15:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.e6182c0608da9361f1ace090a0e367fe5009ee52.001.1","noaa_urn:oid:2.49.0.1.840.0.9d99d13b857a8857a6372831e34fc78e2aba966a.001.1"] |
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.
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