Right now
The most recent data we hold from NOAA arrived 17 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 26 July 2026 at 03:00 UTC. It is kept here as a record.
It is the 22nd strongest of the 79 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 2 July 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 25 at 9:09PM CDT until July 25 at 10:00PM CDT by NWS Sioux Falls SD
Nearby, since 15 March 2026
- July 2, 2026 · score 22 · 3.9 km
- June 28, 2026 · score 43 · 14.6 km
- August 11, 2026 · score 43 · 18.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
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 | 0.61/1 |
| Coordinates | 43.1387, -96.3627 |
| Nearest City | Sioux Falls (54 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-26T02:09:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.c70868ea45f62aba58e14f9c5054f8d0 |
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: 2026-07-26T02:09:00.000Z.
First archived: 2026-07-26T02:16:25.025Z. 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 | Cherokee, IA; O'Brien, IA; Plymouth, IA; Sioux, IA; Clay, SD; Lincoln, SD; Union, SD; Lyon, IA; Osceola, IA; Sioux, IA; Nobles, MN; Rock, MN; Lincoln, SD; Minnehaha, SD; Sioux, IA; Clay, SD; Lincoln, SD; Turner, SD; Union, SD; Yankton, SD |
| Headline | Severe Thunderstorm Warning issued July 25 at 9:09PM CDT until July 25 at 10:00PM CDT by NWS Sioux Falls SD |
| Expires | 2026-07-25T22:00:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c70868ea45f62aba58e14f9c5054f8d026df8e4d.001.1","noaa_urn:oid:2.49.0.1.840.0.aa5dcd3f5574d5753cad2896f4c58ad4db7ece16.001.1","noaa_urn:oid:2.49.0.1.840.0.53ecccb8e4557a594b6908ebddbd497d8f000fc1.001.1"] |
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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