Right now
The most recent data we hold from NOAA arrived 87 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 06:30 UTC. It is kept here as a record.
No stronger detection stands among the 36 recorded within 20 km of this point since 15 March 2026 — 6 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 12:43AM CDT until September 4 at 1:30AM CDT by NWS Green Bay WI
Urban PEI: 242,845 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- July 1, 2026 · 4.8 km
- July 27, 2026 · 11.4 km
- September 4, 2026 · score 49 · 14.7 km
How we know
2 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 | 0.87/1 |
| Coordinates | 44.0659, -88.5319 |
| Nearest City | Oshkosh (5 km) |
| Urban exposure index (PEI) | 242.8K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-04T05:43:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.3b6f0f3640b34b1a492795637ff1932138c69e71.001.1 |
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: 2026-09-04T05:43:00.000Z.
First archived: 2026-09-04T05:46:07.855Z. 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 | Calumet, WI; Winnebago, WI; Fond du Lac, WI; Milwaukee, WI; Ozaukee, WI; Washington, WI; Waukesha, WI and 2 more areas |
| Headline | Severe Thunderstorm Warning issued September 4 at 12:43AM CDT until September 4 at 1:30AM CDT by NWS Green Bay WI |
| Expires | 2026-09-04T01:30:00-05:00 |
| SenderName | NWS Green Bay WI |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["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:2.49.0.1.840.0.07263569754dd9eafd6a80774fb952f1f95f12eb.001.1","noaa_urn:oid:2.49.0.1.840.0.792c1caead1847da43c379bb07e0ae711ae6d701.001.1","noaa_urn:oid:2.49.0.1.840.0.978a6b7e9b4ee57dc57dfe0fbc22113ad77fe88a.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 175 |
| Spc Location | Mayville |
| Spc County | Dodge |
| Spc State | WI |
| Spc Comments | Relay report from NWSChat. (MKX) |
| MergedSources | [{"id":"spc_wind_43.41_-88.53_257","source":"spc","severity":"medium","severityValue":45,"timestamp":1788496200000,"latitude":43.41,"longitude":-88.53},{"id":"spc_wind_43.46_-88.56_258","source":"spc","severity":"medium","severityValue":45,"timestamp":1788496620000,"latitude":43.46,"longitude":-88.56},{"id":"spc_hail_43.50_-88.56_284","source":"spc","severity":"high","severityValue":65,"timestamp":1788496080000,"latitude":43.5,"longitude":-88.56},{"id":"spc_hail_43.50_-88.55_285","source":"spc","severity":"high","severityValue":65,"timestamp":1788496320000,"latitude":43.5,"longitude":-88.55}] |
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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