Right now
The most recent data we hold from NOAA arrived 1 minute 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 8 July 2026 at 06:15 UTC. It is kept here as a record.
No stronger detection stands among the 13 recorded within 20 km of this point since 15 March 2026 — one other scored the same. The last comparable one was on 14 May 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 8 at 12:27AM CDT until July 8 at 1:15AM CDT by NWS Aberdeen SD
Urban PEI: 22,073 within a heuristic 50 km radius; not unique people.
How we know
9 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 | 45.0567, -97.6467 |
| Nearest City | Watertown (45 km) |
| Urban exposure index (PEI) | 22.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-08T05:27:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.12546e3e0e3468202bb7109c1779540f31a73b85.001.1 |
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: 2026-07-08T05:27:00.000Z.
First archived: 2026-07-08T05:44:29.858Z. 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 | Clark, SD; Day, SD |
| Headline | Severe Thunderstorm Warning issued July 8 at 12:27AM CDT until July 8 at 1:15AM CDT by NWS Aberdeen SD |
| Expires | 2026-07-08T01:15:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 70 |
| Iem Unit | MPH |
| Iem City | 7 S Claremont |
| Iem County | Brown |
| Iem State | SD |
| Iem Wfo | ABR |
| Iem Remark | Mesonet station GOTS2 Groton 9 NNE (SD Mesonet). |
| MergedSources | [{"id":"iem_G_45.320_-98.500_1783483980000","source":"iem","severity":"low","severityValue":25,"timestamp":1783483980000,"latitude":45.32,"longitude":-98.5},{"id":"iem_G_45.440_-98.410_1783473660000","source":"iem","severity":"low","severityValue":25,"timestamp":1783473660000,"latitude":45.44,"longitude":-98.41},{"id":"iem_G_45.680_-97.750_1783475400000","source":"iem","severity":"low","severityValue":25,"timestamp":1783475400000,"latitude":45.68,"longitude":-97.75},{"id":"iem_G_44.900_-97.220_1783480020000","source":"iem","severity":"low","severityValue":25,"timestamp":1783480020000,"latitude":44.9,"longitude":-97.22},{"id":"iem_G_45.110_-98.100_1783475400000","source":"iem","severity":"low","severityValue":25,"timestamp":1783475400000,"latitude":45.11,"longitude":-98.1},{"id":"iem_H_45.340_-97.620_1783477080000","source":"iem","severity":"low","severityValue":25,"timestamp":1783477080000,"latitude":45.34,"longitude":-97.62},{"id":"iem_G_45.410_-97.900_1783476000000","source":"iem","severity":"low","severityValue":25,"timestamp":1783476000000,"latitude":45.41,"longitude":-97.9},{"id":"iem_G_45.570_-98.030_1783474500000","source":"iem","severity":"low","severityValue":25,"timestamp":1783474500000,"latitude":45.57,"longitude":-98.03}] |
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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