Right now
The most recent data we hold from NOAA arrived 68 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 15 September 2026 at 07:00 UTC. It is kept here as a record.
It is the 11th strongest of the 19 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 15 at 1:04AM CDT until September 15 at 2:00AM CDT by NWS Omaha/Valley NE
Nearby, since 15 March 2026
- September 9, 2026 · score 16 · 12.2 km
- July 9, 2026 · score 72 · 16.8 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 16 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 v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 16 / 100 |
| Legacy data-support index | 0.72/1 |
| Coordinates | 41.5430, -95.2590 |
| Nearest City | Council Bluffs (59 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-15T06:04:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.4fbf9605691a01e41801eaf88d8ce018ea7d2050.001.1 |
Physical priority index · v5. 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: 2026-09-15T06:04:00.000Z.
First archived: 2026-09-15T06:18:18.164Z. 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 | Harrison, IA; Pottawattamie, IA; Shelby, IA |
| Headline | Severe Thunderstorm Warning issued September 15 at 1:04AM CDT until September 15 at 2:00AM CDT by NWS Omaha/Valley NE |
| Expires | 2026-09-15T02:00:00-05:00 |
| SenderName | NWS Omaha/Valley NE |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | 60 |
| Spc Location | 4 SE Fort Calhoun |
| Spc County | Washington |
| Spc State | NE |
| Spc Comments | Wind gust measured from a public mesonet station. (OAX) |
| Iem TypeSummary | G |
| Iem Magnitude | 58 |
| Iem Unit | MPH |
| Iem City | 5 W Treynor |
| Iem County | Pottawattamie |
| Iem State | IA |
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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