Right now
The most recent data we hold from NOAA arrived 1 minute 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 5 July 2026 at 00:00 UTC. It is kept here as a record.
It is the 5th strongest of the 27 detections recorded within 20 km of this point since 3 June 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 4 at 6:47PM CDT until July 4 at 7:00PM CDT by NWS Aberdeen SD
Nearby, since 3 June 2026
- July 4, 2026 · score 22 · 3.1 km
- July 4, 2026 · score 22 · 15.8 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 | 0.64/1 |
| Coordinates | 44.2996, -99.3689 |
| Nearest City | Mitchell (126 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-04T23:47:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.0f32acea5c13db5255128fe96bed4611 |
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: 2026-07-04T23:47:00.000Z.
First archived: 2026-07-04T23:52:12.198Z. 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 | Hand, SD; Hyde, SD; Lyman, SD |
| Headline | Severe Thunderstorm Warning issued July 4 at 6:47PM CDT until July 4 at 7:00PM CDT by NWS Aberdeen SD |
| Expires | 2026-07-04T19:00:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0f32acea5c13db5255128fe96bed4611af2c8d9a.001.1","noaa_urn:oid:2.49.0.1.840.0.20bed0fc294b5e1adfce898600363969c86fea0e.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 14 SSE Seneca |
| Iem County | Hyde |
| Iem State | SD |
| Iem Wfo | ABR |
| Iem Remark | still hailing at the time of report. |
| MergedSources | [{"id":"iem_H_44.870_-99.400_1783207920000","source":"iem","severity":"low","severityValue":25,"timestamp":1783207920000,"latitude":44.87,"longitude":-99.4}] |
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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