This alert expired on 17 May 2026 at 17:15 UTC. It is kept here as a record.
It is the 4th strongest of the 119 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 17 at 11:39AM CDT until May 17 at 12:15PM CDT by NWS Milwaukee/Sullivan WI
An estimated 359,645 people live within 50 km of this point.
Nearby, since 16 March 2026
- May 17, 2026 · score 67 · 12.0 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 81 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 81% |
| Coordinates | 43.1302, -89.4498 |
| Nearest City | Middleton (5 km) |
| Population Exposed | 359.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-17T16:39:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.597d4cf7cdf69d98706ad7b2e3aa7a80 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Columbia, WI; Dane, WI; Dane, WI |
| Headline | Severe Thunderstorm Warning issued May 17 at 11:39AM CDT until May 17 at 12:15PM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-05-17T12:15:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.597d4cf7cdf69d98706ad7b2e3aa7a80cf64c301.002.1","noaa_urn:oid:2.49.0.1.840.0.7b2b96b8a0ed714c5d4b8d548bca75f7f6494264.001.1"] |
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 10 February 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 Middleton?
Calamity.live data shows a weather event with CalamityScore 43/100, near Middleton (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.