Right now
The most recent data we hold from NOAA arrived 11 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 23:00 UTC. It is kept here as a record.
It is the 3rd strongest of the 18 detections recorded within 20 km of this point since 18 May 2026. 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 May 18 at 5:00PM EDT until May 18 at 7:00PM EDT by NWS Cleveland OH
Nearby, since 18 May 2026
- May 18, 2026 · score 22 · 5.4 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 | 43.3308, -82.9709 |
| Nearest City | Port Huron (60 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-18T21:00:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.a97ecbda3deaafe50470002e8612dd2d |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Maumee Bay to Reno Beach OH; Reno Beach to The Islands OH; Detroit River Lt. to Maumee Bay OH to Reno Beach OH beyond 5NM offshoreline to US-Canadian border; Reno Beach to The Islands OH beyond 5NM off shoreline to US-Canadian border; St. Clair River; Port Austin to Harbor Beach MI; Harbor Beach to Port Sanilac MI; Port Sanilac to Port Huron MI; Lake Huron from Port Austin to Harbor Beach 5NM Off Shore to the US/Canadian border; 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; 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 and 4 more areas |
| Headline | Special Marine Warning issued May 18 at 5:00PM EDT until May 18 at 7:00PM EDT by NWS Cleveland OH |
| Expires | 2026-05-18T19:00:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a97ecbda3deaafe50470002e8612dd2dd4c60014.001.1","noaa_urn:oid:2.49.0.1.840.0.2e6194a1ef50766791d6ffd6ea739b6daa58dbaa.001.1","noaa_urn:oid:2.49.0.1.840.0.cdf52e5513a286eb3c7bda39aa07b9e6b6a48cba.001.1","noaa_urn:oid:2.49.0.1.840.0.2905a386576ce1a46a0d04dcc829db0798e72480.001.1","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"] |
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.