This alert expired on 28 May 2026 at 01:30 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. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 27 at 8:12PM CDT until May 27 at 8:30PM CDT by NWS La Crosse WI
An estimated 68,938 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 11, 2026 · score 16 · 5.5 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 39 out of 100, at 91 % 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 | Medium |
| Calamity Score (ours) | 39 / 100 |
| Our confidence | 91% |
| Coordinates | 44.2029, -90.8900 |
| Nearest City | Onalaska (46 km) |
| Population Exposed | 68.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-28T01:12:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7f6ee2c9e5673a2770b255833f2aa58221e1998b.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Jackson, WI |
| Headline | Severe Thunderstorm Warning issued May 27 at 8:12PM CDT until May 27 at 8:30PM CDT by NWS La Crosse WI |
| Expires | 2026-05-27T20:30:00-05:00 |
| SenderName | NWS La Crosse WI |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 4 SE Loyal |
| Iem County | Clark |
| Iem State | WI |
| Iem Wfo | ARX |
| MergedSources | [{"id":"iem_H_44.290_-90.850_1779930120000","source":"iem","severity":"low","severityValue":25,"timestamp":1779930120000,"latitude":44.29,"longitude":-90.85},{"id":"iem_H_44.700_-90.440_1779922380000","source":"iem","severity":"low","severityValue":25,"timestamp":1779922380000,"latitude":44.7,"longitude":-90.44}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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 39/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.