This alert expired on 12 August 2026 at 05:38 UTC. It is kept here as a record.
It is the 2nd strongest of the 62 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 12 at 12:29AM CDT until August 12 at 12:30AM CDT by NWS La Crosse WI
An estimated 117,284 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 10, 2026 · score 43 · 5.9 km
- May 27, 2026 · score 39 · 12.5 km
- May 27, 2026 · score 43 · 13.3 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 79 % 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) | 43 / 100 |
| Our confidence | 79% |
| Coordinates | 44.5842, -89.9721 |
| Nearest City | Marshfield (18 km) |
| Population Exposed | 117.3K within 50 km |
| Impact Tier | significant |
| Date | 2026-08-12 — time not reported by the source |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.cdf79f68db9135d7294070b713a04d9b |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Clark, WI; Marathon, WI; Wood, WI and 1 more areas |
| Headline | Severe Thunderstorm Warning issued August 12 at 12:29AM CDT until August 12 at 12:30AM CDT by NWS La Crosse WI |
| Expires | 2026-08-12T00:38:00-05:00 |
| SenderName | NWS La Crosse WI |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.cdf79f68db9135d7294070b713a04d9ba34fc865.001.1","noaa_urn:oid:2.49.0.1.840.0.1f2ca48b932a8ca7ae289104f04cef1e6a765cd5.001.1","noaa_urn:oid:2.49.0.1.840.0.9fe87fd7756ce93b213bc5b0f6e8fd3905250f79.001.1","noaa_urn:oid:2.49.0.1.840.0.fe7936eb36671ac7569ad6ce5ffa5d8b04dc3426.002.1"] |
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 near Marshfield?
Calamity.live data shows a weather event with CalamityScore 43/100, near Marshfield (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.