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 28 June 2026 at 08:15 UTC. It is kept here as a record.
No stronger detection stands among the 83 recorded within 20 km of this point since 13 April 2026 — 2 others scored the same. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 28 at 2:48AM CDT until June 28 at 3:15AM CDT by NWS Sioux Falls SD
Urban PEI: 15,669 within a heuristic 50 km radius; not unique people.
How we know
4 recorded sources include NOAA; independence is not established by this count.
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 | 0.90/1 |
| Coordinates | 43.3090, -98.1380 |
| Nearest City | Mitchell (45 km) |
| Urban exposure index (PEI) | 15.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-28T07:48:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.56fb1e90e0a3ed5a171ce0df2a2fa6a447e88589.001.1 |
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: 2026-06-28T07:48:00.000Z.
First archived: 2026-06-28T08:06:43.529Z. 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 | Aurora, SD; Bon Homme, SD; Davison, SD; Douglas, SD; Hanson, SD; Hutchinson, SD |
| Headline | Severe Thunderstorm Warning issued June 28 at 2:48AM CDT until June 28 at 3:15AM CDT by NWS Sioux Falls SD |
| Expires | 2026-06-28T03:15:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 58 |
| Iem Unit | MPH |
| Iem City | 2 WSW Pickstown |
| Iem County | Gregory |
| Iem State | SD |
| Iem Wfo | FSD |
| Iem Remark | Mesonet station 244 SD RWIS Ft. Randall Dam. |
| MergedSources | [{"id":"iem_G_43.290_-98.960_1782628980000","source":"iem","severity":"low","severityValue":25,"timestamp":1782628980000,"latitude":43.29,"longitude":-98.96},{"id":"iem_G_43.080_-98.280_1782631500000","source":"iem","severity":"low","severityValue":25,"timestamp":1782631500000,"latitude":43.08,"longitude":-98.28},{"id":"iem_G_43.050_-98.570_1782629460000","source":"iem","severity":"low","severityValue":25,"timestamp":1782629460000,"latitude":43.05,"longitude":-98.57}] |
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.
Review the area, threshold and delivery channel in your account.
Want to know when something happens in this area?