Right now
The most recent data we hold from NOAA arrived 20 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 11 June 2026 at 14:15 UTC. It is kept here as a record.
It is the 7th strongest of the 20 detections recorded within 20 km of this point since 15 April 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 11 at 8:40AM CDT until June 11 at 9:15AM CDT by NWS Quad Cities IA IL
Urban PEI: 24,624 within a heuristic 50 km radius; not unique people.
Nearby, since 15 April 2026
- July 4, 2026 · score 34 · 23.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 28 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) | 28 / 100 |
| Legacy data-support index | 0.81/1 |
| Coordinates | 41.3957, -92.5928 |
| Nearest City | Ottumwa (44 km) |
| Urban exposure index (PEI) | 24.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-11T13:40:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.2a9dd8ae7440fd868b9d4c30f243999e |
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: 2026-06-11T13:40:00.000Z.
First archived: 2026-06-11T13:41:34.691Z. 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 | Henry, IA; Jefferson, IA; Van Buren, IA; Black Hawk, IA; Bremer, IA; Butler, IA; Franklin, IA; Grundy, IA; Hardin, IA; Daviess, MO; Grundy, MO; Harrison, MO; Mercer, MO; Putnam, MO; Schuyler, MO; Sullivan, MO and 8 more areas |
| Headline | Severe Thunderstorm Warning issued June 11 at 8:40AM CDT until June 11 at 9:15AM CDT by NWS Quad Cities IA IL |
| Expires | 2026-06-11T09:15:00-05:00 |
| SenderName | NWS Quad Cities IA IL |
| HasExactCoords | true |
| MergedCount | 11 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.2a9dd8ae7440fd868b9d4c30f243999e08467e9e.001.1","noaa_urn:oid:2.49.0.1.840.0.4f52deb1aa25610a0c1bbbe424e3385fd3d06fe6.001.1","noaa_urn:oid:2.49.0.1.840.0.6766ee08b9a176065bc12cd0a648b8c8ad8014d1.001.1","noaa_urn:oid:2.49.0.1.840.0.509cb051d69ec0b6bc815c900813ebea259f6ad0.001.1","noaa_urn:oid:2.49.0.1.840.0.9dc282f4d4fe2b706c315956f23e756198191197.002.1","noaa_urn:oid:2.49.0.1.840.0.47d9619f8c1b41f2fdfdb51e7021e0d1ccedf9af.002.1","noaa_urn:oid:2.49.0.1.840.0.e01e24ea3fefd9e05037fddd675237ba0a828967.001.1","noaa_urn:oid:2.49.0.1.840.0.62bf8d10bcda2682944ed3ea14b6bfbf8cea6099.001.1","noaa_urn:oid:2.49.0.1.840.0.d048aab823e15dfad1b684fc666ada590031cf70.001.1","noaa_urn:oid:2.49.0.1.840.0.8dff130b3af8a3be74317581e61d3b86da95c21d.001.1","noaa_urn:oid:2.49.0.1.840.0.16a5eb1fbc92456325c295cca1c17ebf5db84718.001.1"] |
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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