Right now
The most recent data we hold from NOAA arrived 10 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 2 July 2026 at 22:00 UTC. It is kept here as a record.
It is the 6th strongest of the 37 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 2 at 4:31PM CDT until July 2 at 5:00PM CDT by NWS Aberdeen SD
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 | 0.67/1 |
| Coordinates | 44.1504, -98.5820 |
| Nearest City | Mitchell (66 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-02T21:31:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.7d9a346e92cdf16f83172954d3b58d45 |
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: 2026-07-02T21:31:00.000Z.
First archived: 2026-07-02T21:39:51.977Z. 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 | Hand, SD; Beadle, SD; Jerauld, SD; Aurora, SD; Beadle, SD; Davison, SD; Jerauld, SD; Sanborn, SD and 1 more areas |
| Headline | Severe Thunderstorm Warning issued July 2 at 4:31PM CDT until July 2 at 5:00PM CDT by NWS Aberdeen SD |
| Expires | 2026-07-02T17:00:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7d9a346e92cdf16f83172954d3b58d45b84f93ea.002.1","noaa_urn:oid:2.49.0.1.840.0.0a38ecff3f35e86cb5d10b1cf6eab6f781a30082.001.1","noaa_urn:oid:2.49.0.1.840.0.16bc57da45a0555fd6a425464199bb7b4f529463.001.1","noaa_urn:oid:2.49.0.1.840.0.ed9a3478c81a81c638f8e754b300f28ca69b245d.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 62 |
| Iem Unit | MPH |
| Iem City | 3 N Gann Valley |
| Iem County | Buffalo |
| Iem State | SD |
| Iem Wfo | ABR |
| Iem Remark | Mesonet station 201 Gann Valley (SDDOT). |
| MergedSources | [{"id":"iem_T_44.030_-98.950_1783023000000","source":"iem","severity":"low","severityValue":25,"timestamp":1783023000000,"latitude":44.03,"longitude":-98.95},{"id":"iem_G_44.080_-98.990_1783025700000","source":"iem","severity":"low","severityValue":25,"timestamp":1783025700000,"latitude":44.08,"longitude":-98.99}] |
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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