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 25 July 2026 at 22:51 UTC. It is kept here as a record.
No stronger detection stands among the 45 recorded within 20 km of this point since 15 March 2026 — 10 others scored the same. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 25 at 5:41PM CDT until July 25 at 5:45PM CDT by NWS Aberdeen SD
Nearby, since 15 March 2026
- September 8, 2026 · score 16 · 6.3 km
- September 7, 2026 · score 16 · 6.3 km
- September 4, 2026 · score 16 · 18.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
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 | 0.61/1 |
| Coordinates | 44.3280, -100.4021 |
| Nearest City | Aberdeen (196 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-25T22:41:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.f0d2ef09c7dac781702b12588a75fa9a |
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: 2026-07-25T22:41:00.000Z.
First archived: 2026-07-25T22:43:37.491Z. 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 | Lyman, SD; Hand, SD; Hughes, SD; Hyde, SD; Sully, SD; Haakon, SD; Ziebach, SD and 2 more areas |
| Headline | Severe Thunderstorm Warning issued July 25 at 5:41PM CDT until July 25 at 5:45PM CDT by NWS Aberdeen SD |
| Expires | 2026-07-25T17:51:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f0d2ef09c7dac781702b12588a75fa9a69dce81a.001.1","noaa_urn:oid:2.49.0.1.840.0.728af6826cd911d8ae035ec0e6c255e066306fa1.001.1","noaa_urn:oid:2.49.0.1.840.0.8e968aab466b9a6a625eaf0ff612a8ae805a57b0.002.1","noaa_urn:oid:2.49.0.1.840.0.50f1515426eaa94f50d8cc3d01f67d8a6c9d5a09.001.1","noaa_urn:oid:2.49.0.1.840.0.ea3b0d676489736cb2d724f2a00f219dcdf39fd8.002.1"] |
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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