Right now
The most recent data we hold from NOAA arrived 29 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 28 June 2026 at 12:00 UTC. It is kept here as a record.
It is the 3rd strongest of the 56 detections recorded within 20 km of this point since 15 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 June 28 at 6:44AM CDT until June 28 at 7:00AM CDT by NWS Sioux Falls SD
Nearby, since 15 March 2026
- May 18, 2026 · score 46 · 13.1 km
- May 26, 2026 · score 22 · 19.2 km
- June 28, 2026 · score 22 · 21.5 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 22 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) | 22 / 100 |
| Legacy data-support index | 0.65/1 |
| Coordinates | 43.3371, -94.8917 |
| Nearest City | Fort Dodge (110 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-28T11:44:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.aaaeff6f558a06bea22c93b2d74584f8 |
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: 2026-06-28T11:44:00.000Z.
First archived: 2026-06-28T11:47:06.210Z. 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 | Clay, IA; Dickinson, IA; Emmet, IA; Kossuth, IA; Palo Alto, IA; Buena Vista, IA; Cherokee, IA; Clay, IA; Dickinson, IA; O'Brien, IA and 1 more areas |
| Headline | Severe Thunderstorm Warning issued June 28 at 6:44AM CDT until June 28 at 7:00AM CDT by NWS Sioux Falls SD |
| Expires | 2026-06-28T07:00:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.aaaeff6f558a06bea22c93b2d74584f8171a0d10.002.1","noaa_urn:oid:2.49.0.1.840.0.85088afd50c8ce3bc6f450d7c17e96745a7d6b8a.001.1","noaa_urn:oid:2.49.0.1.840.0.98c8fdaa20f86c63d3189b3138b3f9477a490e19.001.1","noaa_urn:oid:2.49.0.1.840.0.67bec69baed1ba165c9226e1d61c6298dc10bb96.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | Sanborn |
| Iem County | O'Brien |
| Iem State | IA |
| Iem Wfo | FSD |
| MergedSources | [{"id":"iem_H_43.190_-95.660_1782644940000","source":"iem","severity":"low","severityValue":25,"timestamp":1782644940000,"latitude":43.19,"longitude":-95.66}] |
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.
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