Right now
The most recent data we hold from NOAA arrived 16 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 01:30 UTC. It is kept here as a record.
No stronger detection stands among the 19 recorded within 20 km of this point since 16 March 2026 — 5 others scored the same. 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: Tornado Warning issued May 17 at 7:59PM CDT until May 17 at 8:30PM CDT by NWS Sioux Falls SD
Nearby, since 16 March 2026
- May 22, 2026 · score 46 · 17.1 km
- June 13, 2026 · score 39 · 21.2 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 46 out of 100, at 65 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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 |
| Our confidence | 65% |
| Coordinates | 42.1615, -95.7862 |
| Nearest City | Sioux City (63 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-18T00:59:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.3c237c0eae4e763e528bbfb5232fbf18 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Cherokee, IA; Plymouth, IA; Woodbury, IA; Faribault, MN; Martin, MN; Douglas, NE; Sarpy, NE; Saunders, NE and 5 more areas |
| Headline | Tornado Warning issued May 17 at 7:59PM CDT until May 17 at 8:30PM CDT by NWS Sioux Falls SD |
| Expires | 2026-05-17T20:30:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3c237c0eae4e763e528bbfb5232fbf18006351f4.001.1","noaa_urn:oid:2.49.0.1.840.0.86e0c5a85aca462d6b290320b4a440c38e41b4bc.001.1","noaa_urn:oid:2.49.0.1.840.0.0e3aec2abbcda1789c14a2519486e76097c6c526.002.1","noaa_urn:oid:2.49.0.1.840.0.d862d9477362ca9ed0fe7a9448175680582ae39c.001.1","noaa_urn:oid:2.49.0.1.840.0.87c868be8c54a714558fb74eafb34e8f9ecb4559.001.1","noaa_urn:oid:2.49.0.1.840.0.32b5da177ff0cad66722f508b16a38d6ef93d853.001.1","noaa_urn:oid:2.49.0.1.840.0.65de716a8e751763ccbd0b13e31a504261dd2c13.001.1","noaa_urn:oid:2.49.0.1.840.0.90be7fe44d866482a1ba3358a7e536cdb1e5ae7d.001.1"] |
| Iem TypeSummary | D |
| Iem City | Bancroft |
| Iem County | Cuming |
| Iem State | NE |
| Iem Wfo | OAX |
| Iem Remark | Power is out in Bancroft. |
| MergedSources | [{"id":"iem_D_42.010_-96.570_1779062940000","source":"iem","severity":"low","severityValue":25,"timestamp":1779062940000,"latitude":42.01,"longitude":-96.57}] |
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.
Want to know when something happens in this area?