Right now
The most recent data we hold from NOAA arrived 7 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 4 July 2026 at 09:15 UTC. It is kept here as a record.
No stronger detection stands among the 23 recorded within 20 km of this point since 16 March 2026 — 3 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 4 at 3:25AM CDT until July 4 at 4:15AM CDT by NWS Des Moines IA
Urban PEI: 24,624 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- June 14, 2026 · score 28 · 9.0 km
- June 13, 2026 · score 28 · 19.1 km
How we know
3 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 | 41.2640, -92.6274 |
| Nearest City | Ottumwa (33 km) |
| Urban exposure index (PEI) | 24.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T08:25:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.a13ebc4e6baee896c038d19b5c36c2b4 |
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: 2026-07-04T08:25:00.000Z.
First archived: 2026-07-04T08:29:25.386Z. 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 | Appanoose, IA; Davis, IA; Lucas, IA; Mahaska, IA; Monroe, IA; Wapello, IA; Lucas, IA; Mahaska, IA; Marion, IA; Monroe, IA; Mahaska, IA; Poweshiek, IA |
| Headline | Severe Thunderstorm Warning issued July 4 at 3:25AM CDT until July 4 at 4:15AM CDT by NWS Des Moines IA |
| Expires | 2026-07-04T04:15:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a13ebc4e6baee896c038d19b5c36c2b4489a69c0.001.1","noaa_urn:oid:2.49.0.1.840.0.8607d56f202377026a5261a75018c2a4e587eff4.002.1","noaa_urn:oid:2.49.0.1.840.0.00f1eb49023904fdec481071a279209f8e77a544.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 59 |
| Iem Unit | MPH |
| Iem City | 3 ENE Searsboro |
| Iem County | Poweshiek |
| Iem State | IA |
| Iem Wfo | DMX |
| Iem Remark | PWS gust. |
| MergedSources | [{"id":"iem_G_41.300_-93.110_1783150800000","source":"iem","severity":"low","severityValue":25,"timestamp":1783150800000,"latitude":41.3,"longitude":-93.11},{"id":"iem_G_41.600_-92.650_1783151880000","source":"iem","severity":"low","severityValue":25,"timestamp":1783151880000,"latitude":41.6,"longitude":-92.65}] |
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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