Right now
The most recent data we hold from NOAA arrived 21 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 3 July 2026 at 00:15 UTC. It is kept here as a record.
It is the 5th strongest of the 34 detections recorded within 20 km of this point since 2 April 2026. 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 2 at 6:09PM CDT until July 2 at 7:15PM CDT by NWS Aberdeen SD
Urban PEI: 23,657 within a heuristic 50 km radius; not unique people.
Nearby, since 2 April 2026
- July 2, 2026 · score 58 · 16.4 km
How we know
11 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 | 0.87/1 |
| Coordinates | 44.3535, -97.3253 |
| Nearest City | Brookings (42 km) |
| Urban exposure index (PEI) | 23.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-02T23:09:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.0406725a884560edfe92f6fdbedb8295 |
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: 2026-07-02T23:09:00.000Z.
First archived: 2026-07-02T23:16:00.565Z. 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; Codington, SD; Deuel, SD; Hamlin, SD; Hanson, SD; Lake, SD; McCook, SD; Miner, SD; Minnehaha, SD; Lake, SD; Miner, SD and 2 more areas |
| Headline | Severe Thunderstorm Warning issued July 2 at 6:09PM CDT until July 2 at 7:15PM CDT by NWS Aberdeen SD |
| Expires | 2026-07-02T19:15:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0406725a884560edfe92f6fdbedb8295f093ad29.001.1","noaa_urn:oid:2.49.0.1.840.0.625c55b1f38dba3ac511ae09395d1aa37f422a70.001.1","noaa_urn:oid:2.49.0.1.840.0.d12d3b522fbe94443bae05ea3260a5e232c60f6a.002.1","noaa_urn:oid:2.49.0.1.840.0.95629726f933bb30f47d175516367868fe922162.001.1","noaa_urn:oid:2.49.0.1.840.0.4e271fd9d7f51aac4a9a1743c528a7cb2fbf3c2c.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 90 |
| Iem Unit | MPH |
| Iem City | 2 NNW Huron |
| Iem County | Beadle |
| Iem State | SD |
| Iem Wfo | FSD |
| Iem Remark | ASOS station KHON Huron Regional Airport. |
| MergedSources | [{"id":"iem_G_44.330_-97.930_1783030260000","source":"iem","severity":"low","severityValue":25,"timestamp":1783030260000,"latitude":44.33,"longitude":-97.93},{"id":"iem_G_44.180_-98.210_1783029240000","source":"iem","severity":"low","severityValue":25,"timestamp":1783029240000,"latitude":44.18,"longitude":-98.21},{"id":"iem_G_44.390_-98.230_1783029780000","source":"iem","severity":"low","severityValue":25,"timestamp":1783029780000,"latitude":44.39,"longitude":-98.23},{"id":"iem_G_44.340_-98.220_1783029720000","source":"iem","severity":"low","severityValue":25,"timestamp":1783029720000,"latitude":44.34,"longitude":-98.22},{"id":"iem_T_44.590_-97.720_1783031400000","source":"iem","severity":"low","severityValue":25,"timestamp":1783031400000,"latitude":44.59,"longitude":-97.72},{"id":"iem_G_44.570_-98.010_1783032000000","source":"iem","severity":"low","severityValue":25,"timestamp":1783032000000,"latitude":44.57,"longitude":-98.01},{"id":"iem_G_44.090_-97.910_1783030200000","source":"iem","severity":"low","severityValue":25,"timestamp":1783030200000,"latitude":44.09,"longitude":-97.91},{"id":"iem_G_44.330_-97.930_1783031340000","source":"iem","severity":"low","severityValue":25,"timestamp":1783031340000,"latitude":44.33,"longitude":-97.93},{"id":"iem_G_44.440_-97.790_1783031460000","source":"iem","severity":"low","severityValue":25,"timestamp":1783031460000,"latitude":44.44,"longitude":-97.79},{"id":"iem_G_44.390_-98.230_1783029360000","source":"iem","severity":"low","severityValue":25,"timestamp":1783029360000,"latitude":44.39,"longitude":-98.23}] |
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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