This alert expired on 16 June 2026 at 19:45 UTC. It is kept here as a record.
No stronger detection stands among the 17 recorded within 20 km of this point since 13 May 2026 — 5 others scored the same. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 16 at 1:39PM CDT until June 16 at 2:45PM CDT by NWS Green Bay WI
An estimated 687,148 people live within 50 km of this point.
Nearby, since 13 May 2026
- September 4, 2026 · score 41 · 3.5 km
- September 4, 2026 · score 37 · 3.8 km
- May 13, 2026 · score 48 · 10.3 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 48 out of 100, at 80 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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) | 48 / 100 |
| Our confidence | 80% |
| Coordinates | 43.4063, -87.5849 |
| Nearest City | Sheboygan (40 km) |
| Population Exposed | 687.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-16T18:39:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.a3f6db04576594e404bb02f1dd00ba68 |
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; North Point Light to Wind Point WI; Wind Point WI to Winthrop Harbor IL; Lake Michigan from North Point Light to Wind Point WI 5NM offshore to Mid Lake; Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM offshore to Mid Lake; Sheboygan to Port Washington WI; Port Washington to North Point Light 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 |
| Headline | Special Marine Warning issued June 16 at 1:39PM CDT until June 16 at 2:45PM CDT by NWS Green Bay WI |
| Expires | 2026-06-16T14:45:00-05:00 |
| SenderName | NWS Green Bay WI |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a3f6db04576594e404bb02f1dd00ba68f409c885.001.1","noaa_urn:oid:2.49.0.1.840.0.a9c8d27bba044e8c1a2889367da95672d141f862.001.1","noaa_urn:oid:2.49.0.1.840.0.4c70874d961ee4dc4a7a0c09edbde718adb525c4.001.1"] |
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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 48/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.