Right now
The most recent data we hold from NOAA arrived 18 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 26 May 2026 at 02:45 UTC. It is kept here as a record.
No stronger detection stands among the 5 recorded within 20 km of this point since 26 May 2026 — 4 others scored the same.
What the source measured
NOAA reported: Special Marine Warning issued May 25 at 9:57PM EDT until May 25 at 10:45PM EDT by NWS Marquette MI
Nearby, since 26 May 2026
- July 26, 2026 · score 22 · 15.3 km
- August 7, 2026 · score 22 · 20.0 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 65 % 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) | 22 / 100 |
| Our confidence | 65% |
| Coordinates | 47.8425, -88.0763 |
| Nearest City | Thunder Bay (106 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-26T01:57:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.bc207304739a3f491f8bcf3ee2be34f2d7c7242f.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park; Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border |
| Headline | Special Marine Warning issued May 25 at 9:57PM EDT until May 25 at 10:45PM EDT by NWS Marquette MI |
| Expires | 2026-05-25T22:45:00-04:00 |
| SenderName | NWS Marquette MI |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 50 |
| Iem Unit | MPH |
| Iem City | 34 ENE Rock of Ages |
| Iem County | Keweenaw |
| Iem State | MI |
| Iem Wfo | MQT |
| Iem Remark | Mesonet station OJIM4 Ojibway - Isle Royale. |
| MergedSources | [{"id":"iem_G_48.110_-88.610_1779758640000","source":"iem","severity":"low","severityValue":25,"timestamp":1779758640000,"latitude":48.11,"longitude":-88.61}] |
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.
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