Right now
The most recent data we hold from NOAA arrived 11 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 8 July 2026 at 23:36 UTC. It is kept here as a record.
No stronger detection stands among the 13 recorded within 20 km of this point since 15 March 2026 — 2 others scored the same. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 8 at 6:26PM CDT until July 8 at 6:30PM CDT by NWS Sioux Falls SD
Urban PEI: 26,474 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- September 12, 2026 · score 16 · 15.1 km
- August 8, 2026 · score 22 · 24.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
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 | 0.80/1 |
| Coordinates | 41.8038, -96.5201 |
| Nearest City | Fremont (42 km) |
| Urban exposure index (PEI) | 26.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-08T23:26:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.effb6b194c6e19b0f8d8ca0b6017509b |
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: 2026-07-08T23:26:00.000Z.
First archived: 2026-07-08T23:30:09.424Z. 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 | Ida, IA; Monona, IA; Calhoun, IA; Carroll, IA; Crawford, IA; Sac, IA and 2 more areas |
| Headline | Severe Thunderstorm Warning issued July 8 at 6:26PM CDT until July 8 at 6:30PM CDT by NWS Sioux Falls SD |
| Expires | 2026-07-08T18:36:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.effb6b194c6e19b0f8d8ca0b6017509bf9193760.001.1","noaa_urn:oid:2.49.0.1.840.0.d07083245ba69967ceecc6c331cec6c43362ff9e.001.1","noaa_urn:oid:2.49.0.1.840.0.6356f42d4284ea65476847a938b77d7107446e96.001.1","noaa_urn:oid:2.49.0.1.840.0.3567f627af53f268fdf958a79f97b09cad809617.001.1","noaa_urn:oid:2.49.0.1.840.0.1a205b5fbf51eaf961820ed7768901c2e5fa8f87.001.1"] |
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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