Right now
The most recent data we hold from NOAA arrived 1 minute 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 01:15 UTC. It is kept here as a record.
It is the 5th strongest of the 33 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 8:09PM CDT until May 27 at 8:15PM CDT by NWS Milwaukee/Sullivan WI
Nearby, since 15 March 2026
- June 6, 2026 · score 46 · 7.9 km
- June 6, 2026 · score 46 · 11.3 km
How we know
Confirmed by 6 independent sources, including NOAA.
Our own score for this event is 22 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 | Medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 70% |
| Coordinates | 43.8129, -90.2650 |
| Nearest City | Wisconsin Rapids (72 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-28T01:09:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.b2d4b6048d9e46a9da837962a5c9a24f |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Columbia, WI; Sauk, WI; Jackson, WI |
| Headline | Severe Thunderstorm Warning issued May 27 at 8:09PM CDT until May 27 at 8:15PM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-05-27T20:15:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b2d4b6048d9e46a9da837962a5c9a24f4b336609.001.1","noaa_urn:oid:2.49.0.1.840.0.cf938937890475aab0d54289745be08d3b92079b.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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