Right now
The most recent data we hold from NOAA arrived 28 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 03:00 UTC. It is kept here as a record.
No stronger detection stands among the 10 recorded within 20 km of this point since 29 June 2026 — 6 others scored the same. The last comparable one was on 20 July 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 26 at 9:57PM EDT until July 26 at 11:00PM EDT by NWS Marquette MI
Nearby, since 29 June 2026
- July 20, 2026 · score 22 · 20.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 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) | 22 / 100 |
| Legacy data-support index | 0.61/1 |
| Coordinates | 47.2309, -89.6568 |
| Nearest City | Thunder Bay (131 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-27T01:57:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.84357a10882f26703a66d12b40788cb6 |
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: 2026-07-27T01:57:00.000Z.
First archived: 2026-07-27T02:11:59.688Z. 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 | Saxon Harbor WI to Black River MI; Black River To Ontonagon MI; 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 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; Grand Marais to Taconite Harbor MN; Taconite Harbor to Silver Bay Harbor MN; Silver Bay Harbor to Two Harbors MN; Port Wing to Sand Island WI; Sand Island to Bayfield WI; Outer Apostle Islands Beyond 5 NM from Mainland; Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM |
| Headline | Special Marine Warning issued July 26 at 9:57PM EDT until July 26 at 11:00PM EDT by NWS Marquette MI |
| Expires | 2026-07-26T23:00:00-04:00 |
| SenderName | NWS Marquette MI |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.84357a10882f26703a66d12b40788cb60df759b2.001.1","noaa_urn:oid:2.49.0.1.840.0.e82f1cd340cf218b068000c449d4b5f01053c37f.001.1","noaa_urn:oid:2.49.0.1.840.0.5cd438f4be38aa2ed27c472709fc0758cb0eab7d.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.
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