Right now
The most recent data we hold from NOAA arrived 4 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
6 other detections within 20 km in the last 24 hours, the nearest 19 km from here.
This alert expired on 4 July 2026 at 06:00 UTC. It is kept here as a record.
It is the 4th strongest of the 36 detections recorded within 20 km of this point since 17 May 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: Flash Flood Warning issued July 3 at 9:57PM CDT until July 4 at 1:00AM CDT by NWS Omaha/Valley NE
Urban PEI: 294,757 within a heuristic 50 km radius; not unique people.
Nearby, since 17 May 2026
- July 4, 2026 · score 43 · 0.0 km
- September 7, 2026 · score 37 · 0.6 km
- September 8, 2026 · score 37 · 8.1 km
How we know
13 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 43 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) | 43 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 40.6200, -96.2950 |
| Nearest City | Lincoln (37 km) |
| Urban exposure index (PEI) | 294.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T02:57:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.f6b9b0d1048cd720aff23c1cbcf17605d6dbb60e.001.1 |
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: 2026-07-04T02:57:00.000Z.
First archived: 2026-07-04T05:48:53.998Z. 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 | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Otoe, NE |
| Headline | Flash Flood Warning issued July 3 at 9:57PM CDT until July 4 at 1:00AM CDT by NWS Omaha/Valley NE |
| Expires | 2026-07-04T01:00:00-05:00 |
| SenderName | NWS Omaha/Valley NE |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 2 ENE Gretna |
| Iem County | Sarpy |
| Iem State | NE |
| Iem Wfo | OAX |
| Iem Remark | Social media report with a photo of quarter sized hail. Time estimated based on radar. |
| Google News RssFeed | weather |
| Google News SourceName | KOLN | Nebraska Local News, Weather, Sports | Lincoln, NE |
| MergedSources | [{"id":"iem_R_41.160_-96.240_1783130520000","source":"iem","severity":"low","severityValue":25,"timestamp":1783130520000,"latitude":41.16,"longitude":-96.24},{"id":"iem_E_41.200_-96.220_1783130160000","source":"iem","severity":"low","severityValue":25,"timestamp":1783130160000,"latitude":41.2,"longitude":-96.22},{"id":"iem_H_40.700_-96.390_1783124760000","source":"iem","severity":"low","severityValue":25,"timestamp":1783124760000,"latitude":40.7,"longitude":-96.39},{"id":"iem_H_41.140_-96.240_1783128240000","source":"iem","severity":"low","severityValue":25,"timestamp":1783128240000,"latitude":41.14,"longitude":-96.24},{"id":"iem_H_41.160_-96.230_1783127940000","source":"iem","severity":"low","severityValue":25,"timestamp":1783127940000,"latitude":41.16,"longitude":-96.23},{"id":"iem_D_40.510_-96.160_1783132200000","source":"iem","severity":"low","severityValue":25,"timestamp":1783132200000,"latitude":40.51,"longitude":-96.16},{"id":"iem_H_40.700_-96.710_1783126560000","source":"iem","severity":"low","severityValue":25,"timestamp":1783126560000,"latitude":40.7,"longitude":-96.71},{"id":"iem_L_41.170_-96.260_1783113420000","source":"iem","severity":"low","severityValue":25,"timestamp":1783113420000,"latitude":41.17,"longitude":-96.26},{"id":"iem_H_40.670_-96.180_1783128300000","source":"iem","severity":"low","severityValue":25,"timestamp":1783128300000,"latitude":40.67,"longitude":-96.18},{"id":"iem_H_40.740_-95.650_1783135680000","source":"iem","severity":"low","severityValue":25,"timestamp":1783135680000,"latitude":40.74,"longitude":-95.65},{"id":"iem_H_41.150_-96.220_1783127940000","source":"iem","severity":"low","severityValue":25,"timestamp":1783127940000,"latitude":41.15,"longitude":-96.22},{"id":"gnews_weather_495312_216","source":"google_news","severity":"medium","severityValue":40,"timestamp":1783124647000,"latitude":40.8,"longitude":-96.67}] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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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