Right now
The most recent data we hold from NOAA arrived 6 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 31 July 2026 at 03:15 UTC. It is kept here as a record.
It is the 3rd strongest of the 27 detections recorded within 20 km of this point since 15 April 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 30 at 9:54PM CDT until July 30 at 10:15PM CDT by NWS Omaha/Valley NE
Urban PEI: 49,271 within a heuristic 50 km radius; not unique people.
Nearby, since 15 April 2026
- August 8, 2026 · score 34 · 9.8 km
- July 8, 2026 · score 34 · 13.3 km
- August 13, 2026 · score 58 · 21.1 km
How we know
2 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 | 0.86/1 |
| Coordinates | 41.5936, -96.8207 |
| Nearest City | Fremont (32 km) |
| Urban exposure index (PEI) | 49.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-31T02:54:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.8d674f1f9f745af2940f0acdaef01a9a56ad1b23.002.1 |
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: 2026-07-31T02:54:00.000Z.
First archived: 2026-07-31T03:00:15.088Z. 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 | Burt, NE; Colfax, NE; Cuming, NE; Dodge, NE |
| Headline | Severe Thunderstorm Warning issued July 30 at 9:54PM CDT until July 30 at 10:15PM CDT by NWS Omaha/Valley NE |
| Expires | 2026-07-30T22:15:00-05:00 |
| SenderName | NWS Omaha/Valley NE |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | 1 SSE Norfolk |
| Iem County | Madison |
| Iem State | NE |
| Iem Wfo | OAX |
| Iem Remark | Image relayed from social media of a 2 ft diameter tree blown down, time estimated from radar. |
| MergedSources | [{"id":"iem_D_42.020_-97.410_1785462180000","source":"iem","severity":"low","severityValue":25,"timestamp":1785462180000,"latitude":42.02,"longitude":-97.41}] |
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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