Right now
The most recent data we hold from NOAA arrived 2 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 16 May 2026 at 05:00 UTC. It is kept here as a record.
It is the 2nd strongest of the 34 detections recorded within 20 km of this point since 16 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 15 at 11:47PM CDT until May 16 at 12:00AM CDT by NWS La Crosse WI
Nearby, since 16 March 2026
- June 18, 2026 · score 22 · 14.7 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 46 out of 100, at 70 % 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 | 70% |
| Coordinates | 43.0140, -90.5400 |
| Nearest City | Dubuque (58 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-16T04:47:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.655ae7ecf4783fefa568d80aa09c91f0603f1f27.001.1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Grant, WI |
| Headline | Tornado Warning issued May 15 at 11:47PM CDT until May 16 at 12:00AM CDT by NWS La Crosse WI |
| Expires | 2026-05-16T00:00:00-05:00 |
| SenderName | NWS La Crosse WI |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 54 |
| Iem Unit | MPH |
| Iem City | Monona |
| Iem County | Clayton |
| Iem State | IA |
| Iem Wfo | ARX |
| MergedSources | [{"id":"iem_G_43.050_-91.450_1778902740000","source":"iem","severity":"low","severityValue":25,"timestamp":1778902740000,"latitude":43.05,"longitude":-91.45},{"id":"iem_G_43.050_-91.390_1778902980000","source":"iem","severity":"low","severityValue":25,"timestamp":1778902980000,"latitude":43.05,"longitude":-91.39}] |
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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