This alert expired on 10 July 2026 at 21:45 UTC. It is kept here as a record.
No stronger detection stands among the 42 recorded within 20 km of this point since 12 March 2026 — 8 others scored the same. The last comparable one was on 6 June 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 10 at 5:20PM EDT until July 10 at 5:45PM EDT by NWS Cleveland OH
An estimated 1,255,060 people live within 50 km of this point.
Nearby, since 12 March 2026
- March 12, 2026 · score 52 · 8.5 km
- August 11, 2026 · score 43 · 14.5 km
- June 6, 2026 · score 52 · 21.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 80 % 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 | 80% |
| Coordinates | 40.2797, -83.2743 |
| Nearest City | Marysville (9 km) |
| Population Exposed | 1.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-10T21:20:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.899bcf221ee51b94c56f62d1e7542730 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Knox, OH; Morrow, OH; Delaware, OH; Licking, OH; Miami, OH |
| Headline | Severe Thunderstorm Warning issued July 10 at 5:20PM EDT until July 10 at 5:45PM EDT by NWS Cleveland OH |
| Expires | 2026-07-10T17:45:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.899bcf221ee51b94c56f62d1e75427300ce88d8e.001.1","noaa_urn:oid:2.49.0.1.840.0.8095b9b47f4ace642dc09b3bb009aedd46bd4c7e.001.1","noaa_urn:oid:2.49.0.1.840.0.81574f4e8dd5f7b5c9ae548744db75c8dbce4f45.002.1"] |
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 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 Marysville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.