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 9 June 2026 at 22:45 UTC. It is kept here as a record.
It is the 2nd strongest of the 13 detections recorded within 20 km of this point since 9 June 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 9 at 3:48PM MDT until June 9 at 4:45PM MDT by NWS Aberdeen SD
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 | 0.60/1 |
| Coordinates | 46.4974, -101.8883 |
| Nearest City | Dickinson (81 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-09T21:48:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.ff22d8fdb8199bf60eb548192067fac7 |
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: 2026-06-09T21:48:00.000Z.
First archived: 2026-06-09T21:53:17.923Z. 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 | Corson, SD; Mercer, ND |
| Headline | Severe Thunderstorm Warning issued June 9 at 3:48PM MDT until June 9 at 4:45PM MDT by NWS Aberdeen SD |
| Expires | 2026-06-09T16:45:00-06:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ff22d8fdb8199bf60eb548192067fac744440918.001.1","noaa_urn:oid:2.49.0.1.840.0.847a172e7bcf31f0cf7cf9ac3d7915a8b35101bf.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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