This alert expired on 9 August 2026 at 15:19 UTC. It is kept here as a record.
It is the 2nd strongest of the 23 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 August 9 at 10:09AM CDT until August 9 at 10:15AM CDT by NWS Milwaukee/Sullivan WI
An estimated 372,032 people live within 50 km of this point.
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 87 % 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 | 87% |
| Coordinates | 43.3712, -89.0147 |
| Nearest City | Beaver Dam (17 km) |
| Population Exposed | 372.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-09T15:09:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.2dbd744745f9e04479974f3bf99fc2a9 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Columbia, WI; Columbia, WI; Dane, WI; Dodge, WI |
| Headline | Severe Thunderstorm Warning issued August 9 at 10:09AM CDT until August 9 at 10:15AM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-08-09T10:19:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.2dbd744745f9e04479974f3bf99fc2a996d39cfe.001.1","noaa_urn:oid:2.49.0.1.840.0.92f23aef8927986aff67048377a611c2a3cea291.001.1","noaa_urn:oid:2.49.0.1.840.0.cea9ee1ca52199901022b4eb6cb95dccbaedca5f.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 50 |
| Iem Unit | MPH |
| Iem City | 1 S Kingston |
| Iem County | Green Lake |
| Iem State | WI |
| Iem Wfo | MKX |
| MergedSources | [{"id":"iem_G_43.680_-89.130_1786286160000","source":"iem","severity":"low","severityValue":25,"timestamp":1786286160000,"latitude":43.68,"longitude":-89.13}] |
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 Beaver Dam?
Calamity.live data shows a weather event with CalamityScore 43/100, near Beaver Dam (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.