This alert expired on 19 May 2026 at 01:00 UTC. It is kept here as a record.
It is the 2nd strongest of the 103 detections recorded within 20 km of this point since 27 March 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: Severe Thunderstorm Watch issued May 18 at 3:32PM EDT until May 18 at 9:00PM EDT by NWS Cleveland OH
An estimated 1,247,659 people live within 50 km of this point.
Nearby, since 27 March 2026
- August 11, 2026 · score 52 · 0.0 km
- August 10, 2026 · score 52 · 0.0 km
- August 9, 2026 · score 52 · 0.0 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 84 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 84% |
| Coordinates | 40.4000, -82.9000 |
| Nearest City | Delaware (18 km) |
| Population Exposed | 1.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T19:32:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.c8f1aa5c2389c132a5acfac9f45ea74f |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| 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; Hancock, OH; Lucas, OH; Ottawa, OH; Sandusky, OH; Seneca, OH; Wood, OH |
| Headline | Severe Thunderstorm Watch issued May 18 at 3:32PM EDT until May 18 at 9:00PM EDT by NWS Cleveland OH |
| Expires | 2026-05-18T21:00:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c8f1aa5c2389c132a5acfac9f45ea74fc47171af.002.1","noaa_urn:oid:2.49.0.1.840.0.c8f1aa5c2389c132a5acfac9f45ea74fc47171af.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 47 |
| Iem Unit | MPH |
| Iem City | 3 SW Kenton |
| Iem County | Hardin |
| Iem State | OH |
| Iem Wfo | ILN |
| MergedSources | [{"id":"iem_G_40.610_-83.640_1779140400000","source":"iem","severity":"low","severityValue":25,"timestamp":1779140400000,"latitude":40.61,"longitude":-83.64}] |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 52/100, near Delaware (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.