Right now
The most recent data we hold from NOAA arrived 41 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 01:02 UTC. It is kept here as a record.
No stronger detection stands among the 12 recorded within 20 km of this point since 2 April 2026 — 3 others scored the same. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 2 at 7:53PM CDT until July 2 at 8:00PM CDT by NWS Sioux Falls SD
Urban PEI: 23,657 within a heuristic 50 km radius; not unique people.
Nearby, since 2 April 2026
- August 29, 2026 · score 22 · 14.8 km
How we know
2 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 | 0.83/1 |
| Coordinates | 44.2308, -96.2359 |
| Nearest City | Brookings (46 km) |
| Urban exposure index (PEI) | 23.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-03T00:53:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.9f41bdc895a5c4cb2f2791292abecb50 |
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: 2026-07-03T00:53:00.000Z.
First archived: 2026-07-03T00:55:56.951Z. 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 | Lincoln, MN; Lyon, MN; Murray, MN; Pipestone, MN; Brookings, SD; Chippewa, MN; Lac qui Parle, MN; Yellow Medicine, MN; Lyon, IA; Lincoln, SD; McCook, SD; Minnehaha, SD; Moody, SD; Turner, SD |
| Headline | Severe Thunderstorm Warning issued July 2 at 7:53PM CDT until July 2 at 8:00PM CDT by NWS Sioux Falls SD |
| Expires | 2026-07-02T20:02:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.9f41bdc895a5c4cb2f2791292abecb50aadc5d2f.001.1","noaa_urn:oid:2.49.0.1.840.0.83cec3a32d5732d1c3d99fc00d17d230c2c7607f.001.1","noaa_urn:oid:2.49.0.1.840.0.f72d156689ffddc410059ea8fc8d71a9f075ed7d.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 61 |
| Iem Unit | MPH |
| Iem City | 4 NW Chester |
| Iem County | Lake |
| Iem State | SD |
| Iem Wfo | FSD |
| Iem Remark | Measured on a personal weather station. |
| MergedSources | [{"id":"iem_G_43.940_-96.970_1783035600000","source":"iem","severity":"low","severityValue":25,"timestamp":1783035600000,"latitude":43.94,"longitude":-96.97}] |
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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