Right now
The most recent data we hold from NOAA arrived 11 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 20 June 2026 at 00:33 UTC. It is kept here as a record.
No stronger detection stands among the 45 recorded within 20 km of this point since 15 March 2026 — 13 others scored the same. Another comparable one was recorded here earlier the same day. 10 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 19 at 7:23PM CDT until June 19 at 7:30PM CDT by NWS Twin Cities/Chanhassen MN
Urban PEI: 84,083 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- June 20, 2026 · score 39 · 13.3 km
- August 9, 2026 · score 39 · 15.3 km
How we know
6 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 39 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 44.5715, -91.4680 |
| Nearest City | Eau Claire (27 km) |
| Urban exposure index (PEI) | 84.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-20T00:23:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.b3be21d62cb599a5ce3b30d4b0c6beeb |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-06-20T00:23:00.000Z.
First archived: 2026-06-20T00:28:12.663Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Eau Claire, WI; Buffalo, WI; Pepin, WI; Pierce, WI and 1 more areas |
| Headline | Severe Thunderstorm Warning issued June 19 at 7:23PM CDT until June 19 at 7:30PM CDT by NWS Twin Cities/Chanhassen MN |
| Expires | 2026-06-19T19:33:00-05:00 |
| SenderName | NWS Twin Cities/Chanhassen MN |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b3be21d62cb599a5ce3b30d4b0c6beebe575797e.001.1","noaa_urn:oid:2.49.0.1.840.0.3f80672c0ca8bffb2dfec25544a1cf7cef98a0ce.001.1","noaa_urn:oid:2.49.0.1.840.0.7bbb88238880b42734826a6093f5e0c6daa88668.002.1","noaa_urn:oid:2.49.0.1.840.0.9b7c829a99e6da5444bc6d8ba1c1d8f750b11450.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 2 ENE Osseo |
| Iem County | Trempealeau |
| Iem State | WI |
| Iem Wfo | ARX |
| Iem Remark | Report of quarter sized hail east of Osseo. |
| MergedSources | [{"id":"iem_D_45.040_-92.040_1781913180000","source":"iem","severity":"low","severityValue":25,"timestamp":1781913180000,"latitude":45.04,"longitude":-92.04},{"id":"iem_D_44.980_-91.930_1781913300000","source":"iem","severity":"low","severityValue":25,"timestamp":1781913300000,"latitude":44.98,"longitude":-91.93},{"id":"iem_C_44.610_-91.190_1781913180000","source":"iem","severity":"low","severityValue":25,"timestamp":1781913180000,"latitude":44.61,"longitude":-91.19},{"id":"iem_H_44.760_-91.460_1781909640000","source":"iem","severity":"low","severityValue":25,"timestamp":1781909640000,"latitude":44.76,"longitude":-91.46},{"id":"iem_H_44.590_-91.170_1781912820000","source":"iem","severity":"low","severityValue":25,"timestamp":1781912820000,"latitude":44.59,"longitude":-91.17}] |
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.
Review the area, threshold and delivery channel in your account.
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