Right now
The most recent data we hold from NOAA arrived 3 hours 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 28 May 2026 at 01:30 UTC. It is kept here as a record.
It is the 5th strongest of the 38 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 27 at 8:06PM CDT until May 27 at 8:30PM CDT by NWS La Crosse WI
Nearby, since 15 March 2026
- June 6, 2026 · score 46 · 9.1 km
- June 6, 2026 · score 46 · 10.7 km
How we know
6 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 22 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) | 22 / 100 |
| Legacy data-support index | 0.70/1 |
| Coordinates | 43.8479, -90.2571 |
| Nearest City | Wisconsin Rapids (69 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-05-28T01:06:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.cf938937890475aab0d54289745be08d |
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: 2026-05-28T01:06:00.000Z.
First archived: 2026-05-28T01:07:40.884Z. 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 | Jackson, WI; Columbia, WI; Sauk, WI |
| Headline | Severe Thunderstorm Warning issued May 27 at 8:06PM 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 |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.cf938937890475aab0d54289745be08d3b92079b.001.1","noaa_urn:oid:2.49.0.1.840.0.e77bf21f1f17168a9bbccec0bc7d01e0d3702d7a.001.1"] |
| Iem TypeSummary | D |
| Iem City | 6 NE Grand Marsh |
| Iem County | Adams |
| Iem State | WI |
| Iem Wfo | ARX |
| Iem Remark | 1 tree blown down. |
| MergedSources | [{"id":"iem_D_43.970_-89.720_1779926160000","source":"iem","severity":"low","severityValue":25,"timestamp":1779926160000,"latitude":43.97,"longitude":-89.72},{"id":"iem_G_44.360_-89.840_1779922920000","source":"iem","severity":"low","severityValue":25,"timestamp":1779922920000,"latitude":44.36,"longitude":-89.84},{"id":"iem_D_44.110_-89.620_1779925560000","source":"iem","severity":"low","severityValue":25,"timestamp":1779925560000,"latitude":44.11,"longitude":-89.62},{"id":"iem_H_43.780_-89.570_1779927360000","source":"iem","severity":"low","severityValue":25,"timestamp":1779927360000,"latitude":43.78,"longitude":-89.57},{"id":"iem_D_43.950_-89.630_1779925860000","source":"iem","severity":"low","severityValue":25,"timestamp":1779925860000,"latitude":43.95,"longitude":-89.63}] |
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.
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