Right now
The most recent data we hold from NOAA arrived 3 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 18 May 2026 at 00:15 UTC. It is kept here as a record.
It is the strongest of the 21 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: Tornado Warning issued May 17 at 6:43PM CDT until May 17 at 7:15PM CDT by NWS Omaha/Valley NE
Urban PEI: 22,797 within a heuristic 50 km radius; not unique people.
Nearby, since 15 April 2026
- May 18, 2026 · score 34 · 15.7 km
- July 9, 2026 · score 34 · 18.6 km
How we know
13 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 58 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 | Critical |
| Calamity Score (ours) | 58 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 41.2069, -97.2518 |
| Nearest City | Columbus (27 km) |
| Urban exposure index (PEI) | 22.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-17T23:43:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.a0e0c832ae015247d2eeb30bc83e3d05 |
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: 2026-05-17T23:43:00.000Z.
First archived: 2026-05-17T23:46:08.938Z. 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 | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Colfax, NE; Colfax, NE; Stanton, NE; Thayer, NE |
| Headline | Tornado Warning issued May 17 at 6:43PM CDT until May 17 at 7:15PM CDT by NWS Omaha/Valley NE |
| Expires | 2026-05-17T19:15:00-05:00 |
| SenderName | NWS Omaha/Valley NE |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a0e0c832ae015247d2eeb30bc83e3d0564e5dc9a.002.1","noaa_urn:oid:2.49.0.1.840.0.b0e4a39ccb87d6f207897caf6c188fa3c11e748d.002.1","noaa_urn:oid:2.49.0.1.840.0.b5a0ea3af605060b9255bfead78b2dacc58df9df.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 50 |
| Iem Unit | MPH |
| Iem City | 9 WNW Genoa |
| Iem County | Nance |
| Iem State | NE |
| Iem Wfo | GID |
| Google News RssFeed | weather |
| Google News SourceName | Lincoln Journal Star |
| MergedSources | [{"id":"iem_G_41.490_-97.890_1779060300000","source":"iem","severity":"low","severityValue":25,"timestamp":1779060300000,"latitude":41.49,"longitude":-97.89},{"id":"iem_D_41.360_-97.980_1779059280000","source":"iem","severity":"low","severityValue":25,"timestamp":1779059280000,"latitude":41.36,"longitude":-97.98},{"id":"iem_H_41.360_-97.980_1779058800000","source":"iem","severity":"low","severityValue":25,"timestamp":1779058800000,"latitude":41.36,"longitude":-97.98},{"id":"iem_G_41.560_-97.460_1779060000000","source":"iem","severity":"low","severityValue":25,"timestamp":1779060000000,"latitude":41.56,"longitude":-97.46},{"id":"iem_G_41.400_-97.600_1779059640000","source":"iem","severity":"low","severityValue":25,"timestamp":1779059640000,"latitude":41.4,"longitude":-97.6},{"id":"iem_G_41.490_-97.730_1779058860000","source":"iem","severity":"low","severityValue":25,"timestamp":1779058860000,"latitude":41.49,"longitude":-97.73},{"id":"iem_D_41.450_-97.730_1779059520000","source":"iem","severity":"low","severityValue":25,"timestamp":1779059520000,"latitude":41.45,"longitude":-97.73},{"id":"iem_G_41.290_-97.740_1779059700000","source":"iem","severity":"low","severityValue":25,"timestamp":1779059700000,"latitude":41.29,"longitude":-97.74},{"id":"iem_G_41.490_-97.890_1779058920000","source":"iem","severity":"low","severityValue":25,"timestamp":1779058920000,"latitude":41.49,"longitude":-97.89},{"id":"gnews_weather_494179_134","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779044640000,"latitude":40.8,"longitude":-96.67},{"id":"gnews_weather_494179_147","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779045572000,"latitude":40.8,"longitude":-96.67},{"id":"gnews_weather_494180_164","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779050700000,"latitude":40.8,"longitude":-96.67}] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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.
Review the area, threshold and delivery channel in your account.
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