Right now
The most recent data we hold from NOAA arrived 2 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 4 September 2026 at 06:00 UTC. It is kept here as a record.
No stronger detection stands among the 32 recorded within 20 km of this point since 15 March 2026 — 18 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 4 at 12:44AM CDT until September 4 at 1:00AM CDT by NWS Milwaukee/Sullivan WI
Urban PEI: 242,845 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- July 2, 2026 · 5.2 km
- September 4, 2026 · score 49 · 8.0 km
- June 6, 2026 · 12.9 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 49 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 v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | High |
| Calamity Score (ours) | 49 / 100 |
| Legacy data-support index | 0.92/1 |
| Coordinates | 43.8956, -88.4768 |
| Nearest City | Fond du Lac (13 km) |
| Urban exposure index (PEI) | 242.8K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-04T05:44:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.6d984955d0b4ad46d68a4e363bee7bf29417e701.001.1 |
Physical priority index · v4 (historical). 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: 2026-09-04T05:44:00.000Z.
First archived: 2026-09-04T05:51:26.650Z. 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 | Milwaukee, WI; Ozaukee, WI; Washington, WI; Waukesha, WI; Calumet, WI; Winnebago, WI; Fond du Lac, WI and 1 more areas |
| Headline | Severe Thunderstorm Warning issued September 4 at 12:44AM CDT until September 4 at 1:00AM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-09-04T01:00:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6d984955d0b4ad46d68a4e363bee7bf29417e701.001.1","noaa_urn:oid:2.49.0.1.840.0.3b6f0f3640b34b1a492795637ff1932138c69e71.001.1","noaa_urn:oid:2.49.0.1.840.0.ed37931cfcb68d6fca125df4143c8d6a3eb91907.001.1","noaa_urn:oid:2.49.0.1.840.0.792c1caead1847da43c379bb07e0ae711ae6d701.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 175 |
| Spc Location | Mayville |
| Spc County | Dodge |
| Spc State | WI |
| Spc Comments | Relay report from NWSChat. (MKX) |
| Iem TypeSummary | D |
| Iem City | 3 SSW Mayville |
| Iem County | Dodge |
| Iem State | WI |
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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