Right now
The most recent data we hold from NOAA arrived 20 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 27 July 2026 at 18:30 UTC. It is kept here as a record.
It is the 20th strongest of the 56 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 27 at 12:57PM CDT until July 27 at 1:30PM CDT by NWS Milwaukee/Sullivan WI
Urban PEI: 156,435 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- May 17, 2026 · score 43 · 3.9 km
- September 4, 2026 · score 37 · 15.4 km
- July 1, 2026 · score 43 · 16.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 37 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 v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 37 / 100 |
| Legacy data-support index | 0.81/1 |
| Coordinates | 43.7205, -87.9507 |
| Nearest City | Sheboygan (20 km) |
| Urban exposure index (PEI) | 156.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-27T17:57:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.25a8d01161e502c5574641b7ee736f71 |
Physical priority index · v1. 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: 2026-07-27T17:57:00.000Z.
First archived: 2026-07-27T18:01:23.393Z. 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 | Fond du Lac, WI; Sheboygan, WI; Muskegon, MI; Oceana, MI; Fond du Lac, WI and 1 more areas |
| Headline | Severe Thunderstorm Warning issued July 27 at 12:57PM CDT until July 27 at 1:30PM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-07-27T13:30:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.25a8d01161e502c5574641b7ee736f71bfcf5ea3.001.1","noaa_urn:oid:2.49.0.1.840.0.1ec18b21567a8c125a7e11a2f3918a8352c64840.002.1","noaa_urn:oid:2.49.0.1.840.0.ce9172a17daee214e23a3382ae8a07486db4845e.001.1","noaa_urn:oid:2.49.0.1.840.0.6fb5ad71aa8f571f6a26e07b80be896973f2c7d4.001.1"] |
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 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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