Right now
The most recent data we hold from NOAA arrived 2 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 8 July 2026 at 03:30 UTC. It is kept here as a record.
It is the 5th strongest of the 28 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 7 July 2026. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 7 at 9:41PM CDT until July 7 at 10:30PM CDT by NWS Aberdeen SD
How we know
4 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 | 45.3616, -96.9901 |
| Nearest City | Watertown (52 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-08T02:41:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.921201cfd4858feaef92d1bde20ec681 |
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: 2026-07-08T02:41:00.000Z.
First archived: 2026-07-08T02:58:37.991Z. 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 | Big Stone, MN; Traverse, MN; Day, SD; Grant, SD; Marshall, SD; Roberts, SD; Clark, SD; Codington, SD; Day, SD; Grant, SD; Roberts, SD |
| Headline | Severe Thunderstorm Warning issued July 7 at 9:41PM CDT until July 7 at 10:30PM CDT by NWS Aberdeen SD |
| Expires | 2026-07-07T22:30:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.921201cfd4858feaef92d1bde20ec6815fdcf439.001.1","noaa_urn:oid:2.49.0.1.840.0.8ba564a0aa8a5a67dfe89f636b7498b0a52b35b4.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 62 |
| Iem Unit | MPH |
| Iem City | Andover |
| Iem County | Day |
| Iem State | SD |
| Iem Wfo | ABR |
| Iem Remark | Mesonet station SD503 in Andover (SDDOT). |
| MergedSources | [{"id":"iem_G_45.680_-97.750_1783475400000","source":"iem","severity":"low","severityValue":25,"timestamp":1783475400000,"latitude":45.68,"longitude":-97.75},{"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}] |
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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