Right now
The most recent data we hold from NOAA arrived 1 minute 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 04:45 UTC. It is kept here as a record.
No stronger detection stands among the 26 recorded within 20 km of this point since 15 March 2026 — one other 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 10:54PM CDT until May 17 at 11:45PM CDT by NWS La Crosse WI
An estimated 51,929 people live within 50 km of this point.
Nearby, since 15 March 2026
- May 18, 2026 · score 63 · 12.8 km
- August 7, 2026 · score 34 · 19.2 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 63 out of 100, at 85 % 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) | 63 / 100 |
| Our confidence | 85% |
| Coordinates | 43.3259, -92.6755 |
| Nearest City | Austin (45 km) |
| Population Exposed | 51.9K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-05-18T03:54:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.ffe7ee1a66226e969ce9716592a968cd |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Chickasaw, IA; Howard, IA; Mitchell, IA; Mower, MN; Floyd, IA; Mitchell, IA |
| Headline | Tornado Warning issued May 17 at 10:54PM CDT until May 17 at 11:45PM CDT by NWS La Crosse WI |
| Expires | 2026-05-17T23:45:00-05:00 |
| SenderName | NWS La Crosse WI |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ffe7ee1a66226e969ce9716592a968cdb8eac23e.001.1","noaa_urn:oid:2.49.0.1.840.0.d746489185f8e6199f856c6c0e93b1b83ea06780.001.1","noaa_urn:oid:2.49.0.1.840.0.53206e1d012205197f0d069645383735e469fc13.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 70 |
| Iem Unit | MPH |
| Iem City | Nora Springs |
| Iem County | Floyd |
| Iem State | IA |
| Iem Wfo | ARX |
| MergedSources | [{"id":"iem_G_43.140_-93.010_1779075240000","source":"iem","severity":"low","severityValue":25,"timestamp":1779075240000,"latitude":43.14,"longitude":-93.01}] |
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 63/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.