Right now
The most recent data we hold from NOAA arrived 20 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 01:15 UTC. It is kept here as a record.
No stronger detection stands among the 16 recorded within 20 km of this point since 16 March 2026 — 2 others scored the same. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued May 17 at 7:51PM CDT until May 17 at 8:15PM CDT by NWS Twin Cities/Chanhassen MN
How we know
4 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 | 42.0119, -95.9330 |
| Nearest City | Sioux City (66 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-05-18T00:51:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.8c768708850422d9163b55a1b66e9b5e |
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: 2026-05-18T00:51:00.000Z.
First archived: 2026-05-18T00:52:35.946Z. 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 | Faribault, MN; Martin, MN; Blue Earth, MN; Martin, MN; Watonwan, MN; Cherokee, IA; Plymouth, IA; Woodbury, IA and 7 more areas |
| Headline | Tornado Warning issued May 17 at 7:51PM CDT until May 17 at 8:15PM CDT by NWS Twin Cities/Chanhassen MN |
| Expires | 2026-05-17T20:15:00-05:00 |
| SenderName | NWS Twin Cities/Chanhassen MN |
| HasExactCoords | true |
| MergedCount | 10 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8c768708850422d9163b55a1b66e9b5eea6bd28e.001.1","noaa_urn:oid:2.49.0.1.840.0.87c868be8c54a714558fb74eafb34e8f9ecb4559.001.1","noaa_urn:oid:2.49.0.1.840.0.eece5509bba11dd0b646a1d874091e73ffff96b7.001.1","noaa_urn:oid:2.49.0.1.840.0.d010bb84af7c6c3aa33aa68e3c450c8d2d439579.001.1","noaa_urn:oid:2.49.0.1.840.0.969e041c93d29a40c4ae801841ee6f9c2c812b62.001.1","noaa_urn:oid:2.49.0.1.840.0.65de716a8e751763ccbd0b13e31a504261dd2c13.001.1","noaa_urn:oid:2.49.0.1.840.0.44cd1d65a34d6bf8da1338ce308abace5cd33f19.002.1","noaa_urn:oid:2.49.0.1.840.0.32b5da177ff0cad66722f508b16a38d6ef93d853.001.1","noaa_urn:oid:2.49.0.1.840.0.f97f8feb762f87aefec8c074aa0fafeed3f80af2.001.1","noaa_urn:oid:2.49.0.1.840.0.a82bd052ba97f218edbd05ce274bd725cab5a524.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | Pender |
| Iem County | Thurston |
| Iem State | NE |
| Iem Wfo | OAX |
| MergedSources | [{"id":"iem_D_42.010_-96.570_1779062940000","source":"iem","severity":"low","severityValue":25,"timestamp":1779062940000,"latitude":42.01,"longitude":-96.57},{"id":"iem_G_42.110_-96.710_1779063360000","source":"iem","severity":"low","severityValue":25,"timestamp":1779063360000,"latitude":42.11,"longitude":-96.71},{"id":"iem_H_42.110_-96.710_1779063360000","source":"iem","severity":"low","severityValue":25,"timestamp":1779063360000,"latitude":42.11,"longitude":-96.71}] |
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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