Right now
The most recent data we hold from NOAA arrived 5 minutes 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 07:15 UTC. It is kept here as a record.
No stronger detection stands among the 6 recorded within 20 km of this point since 14 April 2026 — 5 others scored the same. The last comparable one was on 3 September 2026.
What the source measured
NOAA reported: Special Marine Warning issued September 4 at 12:50AM CDT until September 4 at 2:15AM CDT by NWS Milwaukee/Sullivan WI
Urban PEI: 1,208,105 within a heuristic 50 km radius; not unique people.
Nearby, since 14 April 2026
- July 2, 2026 · 8.3 km
- September 4, 2026 · score 46 · 11.6 km
- September 3, 2026 · score 46 · 13.0 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 46 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 | Medium |
| Calamity Score (ours) | 46 / 100 |
| Legacy data-support index | 0.87/1 |
| Coordinates | 43.1629, -87.7757 |
| Nearest City | Milwaukee (17 km) |
| Urban exposure index (PEI) | 1.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-04T05:50:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.d2c69eb438af773906541a1a80540ef87683b093.001.1 |
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: 2026-09-04T05:50:00.000Z.
First archived: 2026-09-04T05:56:51.554Z. 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 | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Sheboygan to Port Washington WI; Port Washington to North Point Light WI; North Point Light to Wind Point WI; Lake Michigan from Sheboygan to Port Washington WI 5NM offshore to Mid Lake; Lake Michigan from Port Washington to North Point Light WI 5NM offshore to Mid Lake; Lake Michigan from North Point Light to Wind Point WI 5NM offshore to Mid Lake |
| Headline | Special Marine Warning issued September 4 at 12:50AM CDT until September 4 at 2:15AM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-09-04T02:15:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 2 NE Hubertus |
| Spc County | Washington |
| Spc State | WI |
| Spc Comments | Washington County EM reports widespread tree damage across Richfield... including uprooted trees. Estimated winds 60 mph... time estimated by radar. (MKX) |
| MergedSources | [{"id":"spc_wind_43.26_-88.19_6","source":"spc","severity":"medium","severityValue":45,"timestamp":1788502239984,"latitude":43.26,"longitude":-88.19}] |
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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