Right now
The most recent data we hold from NOAA arrived 57 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 6 July 2026 at 21:30 UTC. It is kept here as a record.
No stronger detection stands among the 28 recorded within 20 km of this point since 3 June 2026 — 15 others scored the same. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 6 at 3:41PM CDT until July 6 at 4:30PM CDT by NWS Aberdeen SD
Nearby, since 3 June 2026
- August 8, 2026 · score 16 · 23.7 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
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 | 0.71/1 |
| Coordinates | 43.3493, -100.3201 |
| Nearest City | Mitchell (189 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-06T20:41:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.4652bf25d262d244360b68c44be5ed44 |
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: 2026-07-06T20:41:00.000Z.
First archived: 2026-07-06T20:46:04.280Z. 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; Todd, SD; Mellette, SD; Todd, SD; Tripp, SD and 1 more areas |
| Headline | Severe Thunderstorm Warning issued July 6 at 3:41PM CDT until July 6 at 4:30PM CDT by NWS Aberdeen SD |
| Expires | 2026-07-06T16:30:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4652bf25d262d244360b68c44be5ed446d0240f8.001.1","noaa_urn:oid:2.49.0.1.840.0.ab6d1b91d529d83ff1733ddf6c5304ce6844a187.001.1","noaa_urn:oid:2.49.0.1.840.0.2379e37ed5c83b4bd0c00da0183e0a73b308ad60.001.1","noaa_urn:oid:2.49.0.1.840.0.d0121a29b6ce26825736532256448fa17752c851.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 50 |
| Iem Unit | mph |
| Iem City | Witten |
| Iem County | Tripp |
| Iem State | SD |
| Iem Wfo | UNR |
| MergedSources | [{"id":"iem_H_43.440_-100.090_1783369500000","source":"iem","severity":"low","severityValue":25,"timestamp":1783369500000,"latitude":43.44,"longitude":-100.09},{"id":"iem_G_43.440_-100.090_1783369500000","source":"iem","severity":"low","severityValue":25,"timestamp":1783369500000,"latitude":43.44,"longitude":-100.09}] |
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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