Right now
The most recent data we hold from NOAA arrived 8 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 33rd strongest of the 56 detections recorded within 20 km of this point since 4 April 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 5:52PM EDT until May 18 at 6:15PM EDT by NWS Detroit/Pontiac MI
An estimated 738,789 people live within 50 km of this point.
Nearby, since 4 April 2026
- September 3, 2026 · score 54 · 4.3 km
- September 2, 2026 · score 54 · 4.3 km
- July 18, 2026 · score 48 · 9.5 km
How we know
Confirmed by 7 independent sources, including NOAA.
Our own score for this event is 48 out of 100, at 89 % 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) | 48 / 100 |
| Our confidence | 89% |
| Coordinates | 42.9830, -82.9666 |
| Nearest City | Shelby (35 km) |
| Population Exposed | 738.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T21:52:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.f7725e83da72fb033e3f9e32b8f706bd |
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; Reno Beach to The Islands OH; The Islands to Vermilion OH; Reno Beach to The Islands OH beyond 5NM off shoreline to US-Canadian border; The Islands to Vermilion OH beyond 5 nm off shoreline to US-Canadian border; 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 3 more areas |
| Headline | Special Marine Warning issued May 18 at 5:52PM 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 | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f7725e83da72fb033e3f9e32b8f706bd6f3959e7.001.1","noaa_urn:oid:2.49.0.1.840.0.1e577237abf9bb50e43f5f264f1e4d94fb4c4ba9.001.1","noaa_urn:oid:2.49.0.1.840.0.6a211a7d492e4ed53dc7457b0bc8e87a0548812e.001.1","noaa_urn:oid:2.49.0.1.840.0.4e9315d6435fcbfd0aa25b81933a05101b60d712.001.1","noaa_urn:oid:2.49.0.1.840.0.fa95505119af60681c8140b8d2955505010e4338.001.1","noaa_urn:oid:2.49.0.1.840.0.7bba9aaf3f1e0fee483824f5836213ee6e03884b.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 58 |
| Iem Unit | mph |
| Iem City | Oakland County Intl Air |
| Iem County | Oakland |
| Iem State | MI |
| Iem Wfo | DTX |
| Iem Remark | Measured at KPTK Pontiac Airport |
| 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_42.660_-83.170_1779132240000","source":"iem","severity":"low","severityValue":25,"timestamp":1779132240000,"latitude":42.66,"longitude":-83.17},{"id":"iem_D_42.620_-83.030_1779139140000","source":"iem","severity":"low","severityValue":25,"timestamp":1779139140000,"latitude":42.62,"longitude":-83.03},{"id":"iem_G_42.410_-83.010_1779139080000","source":"iem","severity":"low","severityValue":25,"timestamp":1779139080000,"latitude":42.41,"longitude":-83.01},{"id":"iem_D_42.640_-83.070_1779139140000","source":"iem","severity":"low","severityValue":25,"timestamp":1779139140000,"latitude":42.64,"longitude":-83.07},{"id":"iem_G_42.660_-83.410_1779137100000","source":"iem","severity":"low","severityValue":25,"timestamp":1779137100000,"latitude":42.66,"longitude":-83.41}] |
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 48/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.