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.
This alert expired on 18 May 2026 at 23:00 UTC. It is kept here as a record.
What the source measured
NOAA reported: Tornado Warning issued May 18 at 5:50PM CDT until May 18 at 6:00PM CDT by NWS Omaha/Valley NE
How we know
9 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 46 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) | 46 / 100 |
| Legacy data-support index | 0.69/1 |
| Coordinates | 40.2252, -95.5519 |
| Nearest City | Saint Joseph (78 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-05-18T22:50:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.4b2e765b0c4210184aa60c392a2aea39 |
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: 2026-05-18T22:50:00.000Z.
First archived: 2026-05-18T22:51:58.356Z. 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 | Richardson, NE; Marshall, KS; Taylor, IA and 6 more areas |
| Headline | Tornado Warning issued May 18 at 5:50PM CDT until May 18 at 6:00PM CDT by NWS Omaha/Valley NE |
| Expires | 2026-05-18T18:00:00-05:00 |
| SenderName | NWS Omaha/Valley NE |
| HasExactCoords | true |
| MergedCount | 9 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4b2e765b0c4210184aa60c392a2aea394707a648.001.1","noaa_urn:oid:2.49.0.1.840.0.3ccd967abcb22b1c6d4e75d7c957624ee893a68f.001.1","noaa_urn:oid:2.49.0.1.840.0.9677651058afc48b5e0a178f9092c8a5be4b9560.001.1","noaa_urn:oid:2.49.0.1.840.0.f3f41430828c5c3723898cc296d0a27612ba7a71.001.1","noaa_urn:oid:2.49.0.1.840.0.607bac747de10149c2d252fe8576e3f53260e69e.001.1","noaa_urn:oid:2.49.0.1.840.0.03fe5beb5fcf0ab70abb144c60593bceccc1e7f1.001.1","noaa_urn:oid:2.49.0.1.840.0.416cebf0e8cc4f97120363a85eb6a749ea4d675f.001.1","noaa_urn:oid:2.49.0.1.840.0.218db6c252cd656974223c7809fe9c2e1cd4ea34.001.1","noaa_urn:oid:2.49.0.1.840.0.a818d5479a36e764cb0ebc40ad736e07257145e6.001.1"] |
| Iem TypeSummary | T |
| Iem City | 4 SSW Barada |
| Iem County | Richardson |
| Iem State | NE |
| Iem Wfo | OAX |
| Iem Remark | Multi-vortex tornado reported north of Falls City. |
| MergedSources | [{"id":"iem_G_40.510_-95.490_1779141900000","source":"iem","severity":"low","severityValue":25,"timestamp":1779141900000,"latitude":40.51,"longitude":-95.49},{"id":"iem_H_40.660_-95.490_1779141840000","source":"iem","severity":"low","severityValue":25,"timestamp":1779141840000,"latitude":40.66,"longitude":-95.49},{"id":"iem_G_40.410_-95.860_1779140040000","source":"iem","severity":"low","severityValue":25,"timestamp":1779140040000,"latitude":40.41,"longitude":-95.86},{"id":"iem_G_40.350_-96.050_1779138720000","source":"iem","severity":"low","severityValue":25,"timestamp":1779138720000,"latitude":40.35,"longitude":-96.05},{"id":"iem_G_40.450_-95.700_1779140700000","source":"iem","severity":"low","severityValue":25,"timestamp":1779140700000,"latitude":40.45,"longitude":-95.7},{"id":"iem_T_40.070_-95.820_1779141600000","source":"iem","severity":"low","severityValue":25,"timestamp":1779141600000,"latitude":40.07,"longitude":-95.82},{"id":"iem_H_40.190_-96.010_1779142080000","source":"iem","severity":"low","severityValue":25,"timestamp":1779142080000,"latitude":40.19,"longitude":-96.01},{"id":"iem_T_40.170_-95.620_1779142500000","source":"iem","severity":"low","severityValue":25,"timestamp":1779142500000,"latitude":40.17,"longitude":-95.62}] |
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.
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