Right now
The most recent data we hold from NOAA arrived 5 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 01:18 UTC. It is kept here as a record.
No stronger detection stands among the 20 recorded within 20 km of this point since 23 April 2026 — 3 others scored the same. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued May 17 at 8:08PM CDT until May 17 at 8:15PM CDT by NWS Twin Cities/Chanhassen MN
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 | 42.5603, -95.4545 |
| Nearest City | Sioux City (78 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-18T01:08:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.9031c16790666bcbd34323e5729fdda8 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Faribault, MN; Martin, MN; Cherokee, IA; Plymouth, IA; Woodbury, IA; Harrison, IA; Pottawattamie, IA; Washington, NE and 3 more areas |
| Headline | Tornado Warning issued May 17 at 8:08PM CDT until May 17 at 8:15PM CDT by NWS Twin Cities/Chanhassen MN |
| Expires | 2026-05-17T20:18:00-05:00 |
| SenderName | NWS Twin Cities/Chanhassen MN |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.9031c16790666bcbd34323e5729fdda891c4a358.001.1","noaa_urn:oid:2.49.0.1.840.0.4a9b132f40488ddc150c79b19770fe1966d77974.001.1","noaa_urn:oid:2.49.0.1.840.0.37c62d60a04a60ffa7907b802240b94c0c2105f0.001.1","noaa_urn:oid:2.49.0.1.840.0.f902c82a55b50e2e1441729baf22f438a6377b49.001.1","noaa_urn:oid:2.49.0.1.840.0.87c868be8c54a714558fb74eafb34e8f9ecb4559.001.1","noaa_urn:oid:2.49.0.1.840.0.f05cf1688aad81ae75fb26176381cd04e4248016.002.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 62 |
| Iem Unit | MPH |
| Iem City | 3 ESE Rodney |
| Iem County | Monona |
| Iem State | IA |
| Iem Wfo | OAX |
| Iem Remark | Personal Weather Station. |
| MergedSources | [{"id":"iem_G_42.190_-95.900_1779065280000","source":"iem","severity":"low","severityValue":25,"timestamp":1779065280000,"latitude":42.19,"longitude":-95.9}] |
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?
Calamity.live data shows a weather event with CalamityScore 46/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.