Right now
The most recent data we hold from NOAA arrived 4 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 04:45 UTC. It is kept here as a record.
It is the 2nd strongest of the 29 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued May 17 at 11:03PM CDT until May 17 at 11:45PM CDT by NWS La Crosse WI
An estimated 24,563 people live within 50 km of this point.
Nearby, since 15 March 2026
- May 18, 2026 · score 63 · 8.6 km
- August 7, 2026 · score 34 · 22.6 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 58 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) | 58 / 100 |
| Our confidence | 85% |
| Coordinates | 43.3303, -92.5698 |
| Nearest City | Austin (50 km) |
| Population Exposed | 24.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T04:03:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.b57834152595cd74570d5821f8d8db80 |
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 11:03PM 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.b57834152595cd74570d5821f8d8db8030da0dd1.001.1","noaa_urn:oid:2.49.0.1.840.0.ed0fa20f35f336e91b6e8fa9aeecf34e3916a2c6.001.1","noaa_urn:oid:2.49.0.1.840.0.f59061ab5e4be6d787e1d0c8631b96908bb27307.001.1"] |
| 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 58/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.