Right now
The most recent data we hold from NOAA arrived 33 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 15 June 2026 at 21:15 UTC. It is kept here as a record.
It is the 10th strongest of the 35 detections recorded within 20 km of this point since 14 April 2026. The last comparable one was on 4 June 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 15 at 3:21PM CDT until June 15 at 4:15PM CDT by NWS Aberdeen SD
Nearby, since 14 April 2026
- July 31, 2026 · score 22 · 11.0 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 | 44.8867, -98.7759 |
| Nearest City | Aberdeen (68 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-15T20:21:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.d4b7787b75127e675ece1bdb049b0d26 |
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: 2026-06-15T20:21:00.000Z.
First archived: 2026-06-15T20:33:04.381Z. 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 | Buffalo, SD; Hand, SD; Hughes, SD; Hyde, SD; Sully, SD; Brown, SD; Clark, SD; Day, SD; Edmunds, SD; Faulk, SD; McPherson, SD; Marshall, SD; Spink, SD; Faulk, SD; Hand, SD; Hyde, SD; Potter, SD; Spink, SD |
| Headline | Severe Thunderstorm Warning issued June 15 at 3:21PM CDT until June 15 at 4:15PM CDT by NWS Aberdeen SD |
| Expires | 2026-06-15T16:15:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.d4b7787b75127e675ece1bdb049b0d26b35628f9.001.1","noaa_urn:oid:2.49.0.1.840.0.240fae26bbbe41bfba0082d137334c5866f74a60.001.1","noaa_urn:oid:2.49.0.1.840.0.9c32e8966000471a6ecf33e4f23657a09ec81260.001.1"] |
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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