Right now
The most recent data we hold from NOAA arrived 6 hours 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 1 July 2026 at 08:45 UTC. It is kept here as a record.
It is the 15th strongest of the 47 detections recorded within 20 km of this point since 13 April 2026. Another comparable one was recorded here earlier the same day. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 1 at 3:08AM CDT until July 1 at 3:45AM CDT by NWS Sioux Falls SD
Urban PEI: 15,669 within a heuristic 50 km radius; not unique people.
Nearby, since 13 April 2026
- May 31, 2026 · score 58 · 15.1 km
- June 1, 2026 · score 40 · 15.6 km
How we know
5 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 | 0.91/1 |
| Coordinates | 43.4655, -97.5753 |
| Nearest City | Mitchell (46 km) |
| Urban exposure index (PEI) | 15.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-01T08:08:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.237c3a205ef681b7fb1143c8a9376e30 |
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: 2026-07-01T08:08:00.000Z.
First archived: 2026-07-01T08:12:47.497Z. 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 | Jerauld, SD; Sanborn, SD; Lyon, IA; O'Brien, IA; Osceola, IA; Sioux, IA; Nobles, MN; Rock, MN; Lincoln, SD; Minnehaha, SD; Bon Homme, SD; Hutchinson, SD; Turner, SD; Yankton, SD and 5 more areas |
| Headline | Severe Thunderstorm Warning issued July 1 at 3:08AM CDT until July 1 at 3:45AM CDT by NWS Sioux Falls SD |
| Expires | 2026-07-01T03:45:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.237c3a205ef681b7fb1143c8a9376e30ed387304.001.1","noaa_urn:oid:2.49.0.1.840.0.c07c2475476875d20fe088a5f47b9599af325967.001.1","noaa_urn:oid:2.49.0.1.840.0.907f6a8f7d44625e3a61350c930f7c2a9c66503c.001.1","noaa_urn:oid:2.49.0.1.840.0.2cdefab1a1fac04f224cf6b89228a2952e7be123.001.1","noaa_urn:oid:2.49.0.1.840.0.a6a16c54ace78aa35bf8c4243f021056bc99e474.002.1","noaa_urn:oid:2.49.0.1.840.0.df40fa310c8e53dcc76d3b4b50c3d232ea98fa6d.001.1","noaa_urn:oid:2.49.0.1.840.0.9eb0802e35e9d253c77ae9a243876af9ae66de38.001.1","noaa_urn:oid:2.49.0.1.840.0.7414ae36be990680b552c63b429ab509e7eadee6.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 64 |
| Iem Unit | MPH |
| Iem City | 5 NE Dante |
| Iem County | Charles Mix |
| Iem State | SD |
| Iem Wfo | FSD |
| Iem Remark | SDDOT report of 64 mph gust at 2:09 am CDT. |
| MergedSources | [{"id":"iem_G_43.500_-97.850_1782891720000","source":"iem","severity":"low","severityValue":25,"timestamp":1782891720000,"latitude":43.5,"longitude":-97.85},{"id":"iem_G_43.120_-98.070_1782889800000","source":"iem","severity":"low","severityValue":25,"timestamp":1782889800000,"latitude":43.12,"longitude":-98.07},{"id":"iem_G_43.380_-98.160_1782890820000","source":"iem","severity":"low","severityValue":25,"timestamp":1782890820000,"latitude":43.38,"longitude":-98.16},{"id":"iem_G_43.090_-98.120_1782889740000","source":"iem","severity":"low","severityValue":25,"timestamp":1782889740000,"latitude":43.09,"longitude":-98.12}] |
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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