Right now
The most recent data we hold from NOAA arrived 12 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 17 May 2026 at 20:45 UTC. It is kept here as a record.
It is the 2nd strongest of the 26 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 17 at 2:53PM CDT until May 17 at 3:45PM CDT by NWS Green Bay WI
Urban PEI: 81,807 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- July 1, 2026 · score 43 · 27.2 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 39 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) | 39 / 100 |
| Legacy data-support index | 0.84/1 |
| Coordinates | 43.9292, -87.5179 |
| Nearest City | Manitowoc (21 km) |
| Urban exposure index (PEI) | 81.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-17T19:53:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.f306e7f64e8876b3f1151897b53a2f88 |
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: 2026-05-17T19:53:00.000Z.
First archived: 2026-05-17T19:59:40.108Z. 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 | Two Rivers to Sheboygan WI; Lake Michigan from Two Rivers to Sheboygan WI 5NM offshore to Mid Lake; Sheboygan to Port Washington WI; Lake Michigan from Sheboygan to Port Washington WI 5NM offshore to Mid Lake |
| Headline | Special Marine Warning issued May 17 at 2:53PM CDT until May 17 at 3:45PM CDT by NWS Green Bay WI |
| Expires | 2026-05-17T15:45:00-05:00 |
| SenderName | NWS Green Bay WI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f306e7f64e8876b3f1151897b53a2f880ad42f04.001.1","noaa_urn:oid:2.49.0.1.840.0.d21f72c93959670e92fdb806d9644489bed1ea09.001.1"] |
| Iem TypeSummary | D |
| Iem City | 1 N Howards Grove |
| Iem County | Sheboygan |
| Iem State | WI |
| Iem Wfo | MKX |
| Iem Remark | At 230pm, Law Enforcement reported ~4 telephone poles down near the intersection of County Hwy FF and State Hwy 42. Damage time estimated from radar (215pm). |
| MergedSources | [{"id":"iem_D_43.850_-87.820_1779045300000","source":"iem","severity":"low","severityValue":25,"timestamp":1779045300000,"latitude":43.85,"longitude":-87.82}] |
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.
Want to know when something happens near Manitowoc?