Right now
The most recent data we hold from NOAA arrived 3 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 20 May 2026 at 00:30 UTC. It is kept here as a record.
It is the 3rd strongest of the 84 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 10 May 2026. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 19 at 7:23PM EDT until May 19 at 8:30PM EDT by NWS Cleveland OH
Urban PEI: 1,476,239 within a heuristic 50 km radius; not unique people.
Nearby, since 11 March 2026
- July 5, 2026 · score 52 · 2.9 km
- August 10, 2026 · score 52 · 4.3 km
- September 3, 2026 · score 46 · 7.6 km
How we know
4 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 52 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) | 52 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 41.6370, -81.8650 |
| Nearest City | Rocky River (18 km) |
| Urban exposure index (PEI) | 1.5M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-19T23:23:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.1b0836da0574d890f126d2d88175b3209884f52d.002.1 |
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: 2026-05-19T23:23:00.000Z.
First archived: 2026-05-20T00:26:24.942Z. 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 | Vermilion to Avon Point OH; Avon Point to Willowick OH; Vermilion to Avon Point OH beyond 5 nm off shoreline to US-Canadian border; Avon Point to Willowick OH beyond 5 nm off shoreline to US-Canadian border |
| Headline | Special Marine Warning issued May 19 at 7:23PM EDT until May 19 at 8:30PM EDT by NWS Cleveland OH |
| Expires | 2026-05-19T20:30:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| Iem TypeSummary | M |
| Iem Magnitude | 40 |
| Iem Unit | MPH |
| Iem City | 3 E Huron |
| Iem County | LEZ144 |
| Iem State | OH |
| Iem Wfo | CLE |
| Iem Remark | Buoy 45203 2 E Huron reported a 35 kt marine thunderstorm wind gust. |
| MergedSources | [{"id":"iem_M_41.400_-82.550_1779231600000","source":"iem","severity":"low","severityValue":25,"timestamp":1779231600000,"latitude":41.4,"longitude":-82.55},{"id":"iem_M_41.540_-82.730_1779230880000","source":"iem","severity":"low","severityValue":25,"timestamp":1779230880000,"latitude":41.54,"longitude":-82.73},{"id":"iem_M_41.390_-82.510_1779232200000","source":"iem","severity":"low","severityValue":25,"timestamp":1779232200000,"latitude":41.39,"longitude":-82.51}] |
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.
Review the area, threshold and delivery channel in your account.
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