Right now
The most recent data we hold from NOAA arrived 5 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 22:15 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. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 18 at 5:15PM EDT until May 18 at 6:15PM EDT by NWS Detroit/Pontiac MI
Nearby, since 18 May 2026
- May 18, 2026 · score 22 · 7.2 km
- June 11, 2026 · score 28 · 17.4 km
How we know
4 recorded sources include NOAA; independence is not established by this count.
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 | 0.69/1 |
| Coordinates | 43.3730, -83.0288 |
| Nearest City | Burton (63 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-05-18T21:15:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.0a4ae23467643d6ed9082c6ac049a0f5 |
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: 2026-05-18T21:15:00.000Z.
First archived: 2026-05-18T21:28:56.529Z. 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 | Detroit River; Lake St. Clair Open Lake (U.S. Portion); Michigan Waters of Lake Erie from Detroit River to North Cape MI; 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; 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 and 4 more areas |
| Headline | Special Marine Warning issued May 18 at 5:15PM EDT until May 18 at 6:15PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-05-18T18:15:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0a4ae23467643d6ed9082c6ac049a0f56dea81d5.001.1","noaa_urn:oid:2.49.0.1.840.0.09e1204c4e7b724d1badd316ce9e0ade861f6cb4.001.1","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.e2e54ebae713dd814300bfe7e7e538e6b15d7e14.001.1","noaa_urn:oid:2.49.0.1.840.0.fa95505119af60681c8140b8d2955505010e4338.001.1"] |
| Iem TypeSummary | D |
| Iem City | 1 NE Essexville |
| Iem County | Bay |
| Iem State | MI |
| Iem Wfo | DTX |
| Iem Remark | Report of 10 to 12 inch tree limbs down |
| MergedSources | [{"id":"iem_D_43.220_-83.430_1779137400000","source":"iem","severity":"low","severityValue":25,"timestamp":1779137400000,"latitude":43.22,"longitude":-83.43},{"id":"iem_D_43.430_-83.860_1779135480000","source":"iem","severity":"low","severityValue":25,"timestamp":1779135480000,"latitude":43.43,"longitude":-83.86},{"id":"iem_D_43.620_-83.830_1779135960000","source":"iem","severity":"low","severityValue":25,"timestamp":1779135960000,"latitude":43.62,"longitude":-83.83}] |
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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