Right now
The most recent data we hold from NOAA arrived 10 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 18 May 2026 at 21:45 UTC. It is kept here as a record.
It is the 3rd strongest of the 35 detections recorded within 20 km of this point since 5 April 2026. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 18 at 4:50PM EDT until May 18 at 5:45PM EDT by NWS Gaylord MI
Nearby, since 5 April 2026
- May 18, 2026 · score 22 · 8.5 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, at 59 % 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 | 59% |
| Coordinates | 43.6393, -82.9893 |
| Nearest City | Bay City (73 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-18T20:50:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.cdf52e5513a286eb3c7bda39aa07b9e6 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Presque Isle Light to Sturgeon Pt MI Including Thunder Bay National Marine Sanctuary; Sturgeon Pt to Alabaster MI; Lake Huron from Presque Isle Lt. to Sturgeon Point MI 5NM off shore to US/Canadian border; Lake Huron from Sturgeon Point to Alabaster MI 5NM off shore to US/Canadian border; Harbor Beach to Port Sanilac MI; Port Sanilac to Port Huron MI; Lake Huron from Harbor Beach to Port Sanilac 5NM Off Shore to US/Canadian border; Lake Huron from Port Sanilac to Port Huron 5NM Off Shore to US/Canadian border; Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw Bay; Inner Saginaw Bay SW of Point Au Gres to Bay Port MI and 2 more areas |
| Headline | Special Marine Warning issued May 18 at 4:50PM EDT until May 18 at 5:45PM EDT by NWS Gaylord MI |
| Expires | 2026-05-18T17:45:00-04:00 |
| SenderName | NWS Gaylord MI |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.cdf52e5513a286eb3c7bda39aa07b9e6b6a48cba.001.1","noaa_urn:oid:2.49.0.1.840.0.e2e54ebae713dd814300bfe7e7e538e6b15d7e14.001.1","noaa_urn:oid:2.49.0.1.840.0.2edc256ed997d0e51d150db05be0b53e35fc218f.001.1","noaa_urn:oid:2.49.0.1.840.0.e3d0705f3dd4bd44e638cbfbaaea61c95c8a6298.001.1","noaa_urn:oid:2.49.0.1.840.0.2905a386576ce1a46a0d04dcc829db0798e72480.001.1"] |
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 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.