Right now
The most recent data we hold from NOAA arrived 4 hours 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 10 June 2026 at 05:00 UTC. It is kept here as a record.
No stronger detection stands among the 184 recorded within 20 km of this point since 15 March 2026 — 27 others scored the same. The last comparable one was on 8 June 2026. 27 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Watch issued June 9 at 4:34PM CDT until June 10 at 12:00AM CDT by NWS Sioux Falls SD
Nearby, since 15 March 2026
- August 11, 2026 · score 22 · 0.0 km
- June 9, 2026 · score 34 · 0.0 km
- June 5, 2026 · score 22 · 0.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
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 | 0.60/1 |
| Coordinates | 43.9000, -99.4000 |
| Nearest City | Mitchell (112 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-09T21:34:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Watch_noaa_urn:oid:2.49.0.1.840.0.b169f0c3c6c7d3f1b7b13f4e9e1bd5bb |
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: 2026-06-09T21:34:00.000Z.
First archived: 2026-06-09T23:44:16.955Z. 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 | Tornado Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Aurora, SD; Brule, SD; Charles Mix, SD; Douglas, SD; Gregory, SD; Jerauld, SD; Bennett, SD; Haakon, SD; Jackson, SD; Mellette, SD; Perkins, SD; Todd, SD; Tripp, SD; Ziebach, SD; Buffalo, SD; Campbell, SD; Corson, SD; Dewey, SD; Edmunds, SD; Faulk, SD; Hand, SD; Hughes, SD; Hyde, SD; Jones, SD; Lyman, SD; McPherson, SD; Potter, SD; Stanley, SD; Sully, SD; Walworth, SD |
| Headline | Tornado Watch issued June 9 at 4:34PM CDT until June 10 at 12:00AM CDT by NWS Sioux Falls SD |
| Expires | 2026-06-10T00:00:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | false |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b169f0c3c6c7d3f1b7b13f4e9e1bd5bbd809a6f0.001.1","noaa_urn:oid:2.49.0.1.840.0.c8f9155be1be8a8e1e4f38170e1726bec3c030e9.001.1","noaa_urn:oid:2.49.0.1.840.0.25b54afbe5c3c8d8bbe5e6392ae840b435afac88.001.1"] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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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